Mycena polygramma

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Mycena polygramma
Mycena cf amicta - Lindsey 1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Mycenaceae
Genus: Mycena
Species:
M. polygramma
Binomial name
Mycena polygramma
(Bull.) Gray (1821)
Synonyms [1] [2]
  • Agaricus chloroticus Jungh.
  • Agaricus polygrammusBull. (1789)
  • Mycena polygramma f. candidaJ.E.Lange (1914)
  • Mycena polygramma f. pumilaJ.E.Lange (1914)
Mycena polygramma
Information icon.svg
Gills icon.png Gills on hymenium
Conical cap icon.svg Cap is conical
Adnate gills icon2.svg Hymenium is adnate
Bare stipe icon.svg Stipe is bare
Transparent spore print icon.svg
Spore print is white
Saprotrophic fungus.svgEcology is saprotrophic
Mycomorphbox Inedible.pngEdibility is inedible

Mycena polygramma, commonly known as the grooved bonnet, is a species of mushroom in the family Mycenaceae. The inedible fruit bodies are small, pale gray-brown mushrooms with broadly conical caps, pinkish gills. They are found in small troops on stumps and branches of deciduous and occasionally coniferous trees. The mushroom is found in Asia, Europe, and North America, where it is typically found on twigs or buried wood, carrying out its role in the forest ecosystem by decomposing organic matter, recycling nutrients, and forming humus in the soil. M. polygramma contains two uncommon hydroxy fatty acids and is also a bioluminescent fungus whose intensity of light emission follows a diurnal pattern.

Contents

Taxonomy

First called Agaricus polygrammus by French mycologist Jean Bulliard in 1789, [3] the species was later sanctioned under that name by Elias Magnus Fries in his Systema Mycologicum . [4] It was soon after transferred into the genus Mycena in 1821 by Samuel Frederick Gray, [5] who raised many of Fries' sub-generic divisions to the genus level. Agaricus chloroticus, described by Friedrich Franz Wilhelm Junghuhn in 1830, is the only known taxonomic synonym. [1] The specific epithet is derived from the Greek πολύς meaning "many" and γραμμή, or "line". [6] It is commonly known as the "grooved bonnet". [7]

Description

The gills are squarely attached to the stem and flushed with pink in maturity. Mycena spec. - Lindsey 15b.jpg
The gills are squarely attached to the stem and flushed with pink in maturity.

The cap of the M. polygramma fruit body is 2 to 4 cm (0.8 to 1.6 in) in diameter, and initially egg- to cone-shaped, but expands to become conic to bell-shaped or nearly convex with an abrupt small umbo, or at times plane with a conic umbo. On young fruit bodies, the cap margin is slightly curved inward, and frequently has scalloped edges; in maturity the margin flares out or is recurved and wavy. The surface of the cap is initially covered with short, fine whitish or grayish hairs that often persist until near maturity. With age, the cap surface becomes smooth, the color dark brownish gray to black beneath the bloom, fading slowly to a pale gray, and nearly pinkish-buff at times. The cap margin is opaque and frequently has narrow, deep furrows or grooves, with the surface often more or less uneven and appearing as if streaked with glistening lines. The flesh is very hard and cartilaginous, watery grayish to white, rather thin, and with no distinctive odor and a mild taste. [8]

The gills are narrowly adnate (attached squarely to the stem) or have a short decurrent tooth, and are packed close together, with 30–38 gills reaching the stem. They are broad anteriorly (4–7 mm), white or whitish, in age flushed with pink, often with sordid-brownish stains, and with edges pallid and even. The stem is 6 to 15 cm (2.4 to 5.9 in) long, 0.2 to 0.5 cm (0.1 to 0.2 in) thick, very brittle and cartilaginous, equal, and tubular. It sometimes has a well-developed pseudorrhiza that resembles white cotton, and the base is covered with stiff white hairs, and often it stains reddish brown. The surface has fine straight or sometimes twisted longitudinal striations. The surface is ashy-gray or paler grayish brown beneath the silvery covering, at times nearly smooth, with the apex pallid and faintly powdered. [8]

Various images of M. polygramma from Bulliard's Herbier de la France, 1789 Bulliard Herbier de la France 1789 plate 395.jpg
Various images of M. polygramma from Bulliard's Herbier de la France, 1789

Mycena polygramma is a bioluminescent mushroom, although the extent of luminescence can vary considerably. [9] The mushroom is inedible, [10] and has a mild to slightly acrid taste and a "pleasant" odor. [11]

Microscopic features

Collected in deposit, such as in a spore print, the spores appear white. Viewed with a light microscope, the spores are broadly ellipsoid in shape, smooth, amyloid, with dimensions of 7.5–10 by 5–6  μm. Occasionally the spores contain oil droplets. [10] The basidia (pore-bearing cells) are four-spored, 26–30 by 7–8 μm. The cheilocystidia are scattered to abundant, aciculate or with the midportion somewhat enlarged and the apex forked or branched and give rise to two or several contorted finger-like projections. Pleurocystidia are not differentiated. [8]

Similar species

Tall and slender forms of Mycena polygramma somewhat resemble M. pullata or M. praelonga . The former species is distinguished by its color, and the latter by its relationship to M. alcalina and its habitat on sphagnum. [12]

Ecology, habitat and distribution

The fruit bodies of M. polygramma grow in groups or sub-clusters under hardwoods, particularly deciduous trees such as oak, maple, and basswood. In North America, it has been collected from North Carolina, Massachusetts, New York, and Michigan, where it fruits from June to October. [8] The fruit bodies are susceptible to attack by the parasitic fungi Spinellus fusiger and S. macrocarpus . [13]

Typically found on twigs or buried wood, [11] the fungus is known to be a vigorous decomposer of lignin and cellulose in leaf litter. [14] Mycena polygramma is a saprobic fungus and is one of many fungi that contribute to plant litter decomposition in forest ecosystems through nutrient recycling and humus formation in soil. It is a lignocellulose decomposer of larch litter, and can break down both lignin and carbohydrates, although it has a preference for carbohydrates. [15] In an experiment testing the ability of several litter-decomposing fungi to remove lignin from leaves of the perennial grass Miscanthus sinensis , under pure culture conditions, M. polygramma showed limited ability to cause the mass loss of lignin. [16]

Rare in North America, [8] the fungus is common in Europe, including Great Britain. [10] They have been collected on the Falkland Islands, [17] and Japan. [14]

Chemistry and bioluminescence

Mycena polygramma contains the unusual hydroxy fatty acids 7-hydroxy-8,14-dimethyl-9-hexadecenoic acid (0.05% of the total fatty acids) and 7-hydroxy-8,16-dimethyl-9-octadecenoic acid (0.01%). [18]

The fungus is one of several dozen Mycena species that are bioluminescent. [19] Unlike most luminescent organisms, M. polygramma has a diurnal rhythm of luminescence intensity and it rises and falls to a light intensity as high as 35 percent. However, this light emission is not typically noticed, as it cannot be detected visually by the dark-adapted eye; sensitive photomultipliers or long exposure times are required to measure the phenomenon. [20] The wavelength of spectral emissions from the fungus grown in pure culture is in the range 470–640 mμ. [21]

See also

Related Research Articles

<i>Mycena</i> Genus of fungi

Mycena is a large genus of small saprotrophic mushrooms that are rarely more than a few centimeters in width. The name Mycena comes from the Ancient Greek μύκηςmykes, meaning "fungus". Species in the genus Mycena are commonly known as bonnets.

<i>Mycena galopus</i> Species of fungus

Mycena galopus, commonly known as the milky mycena, milking bonnet or milk-drop mycena, is an inedible species of fungus in the family Mycenaceae of the order Agaricales. It produces small mushrooms that have grayish-brown, bell-shaped, radially-grooved caps up to 2.5 cm (1 in) wide. The gills are whitish to gray, widely spaced, and squarely attached to the stem. The slender stems are up to 8 cm (3 in) long, and pale gray at the top, becoming almost black at the hairy base. The stem will ooze a whitish latex if it is injured or broken. The variety nigra has a dark gray cap, while the variety candida is white. All varieties of the mushroom occur during summer and autumn on leaf litter in coniferous and deciduous woodland.

<i>Mycena haematopus</i> Fungus species in the family Mycenaceae widespread and common in Europe and North America

Mycena haematopus, commonly known as the bleeding fairy helmet, the burgundydrop bonnet, or the bleeding Mycena, is a species of fungus in the family Mycenaceae, of the order Agaricales. It is widespread and common in Europe and North America, and has also been collected in old Japan and Venezuela. It is saprotrophic—meaning that it obtains nutrients by consuming decomposing organic matter—and the fruit bodies appear in small groups or clusters on the decaying logs, trunks, and stumps of deciduous trees, particularly beech. The fungus, first described scientifically in 1799, is classified in the section Lactipedes of the genus Mycena, along with other species that produce a milky or colored latex.

<i>Mycena galericulata</i> Species of fungus

Mycena galericulata is a mushroom species commonly known as the common bonnet, the toque mycena, the common mycena or the rosy-gill fairy helmet. The type species of the genus Mycena was first described scientifically in 1772, but was not considered a Mycena until 1821. It is quite variable in color, size, and shape, which makes it somewhat difficult to reliably identify in the field. The mushrooms have caps with distinct radial grooves, particularly at the margin. The cap's color varies from grayish brown to dark brown and the shape ranges from bell-like to bluntly conical to flattened with an umbo. The stem is hollow, white, tough and thin, without a ring and often roots deeply into the wood on which it grows. The gills are white to grayish or even pinkish when mature and are connected by distinct cross-veins. The caps can reach 4 cm (1.6 in) in diameter, and have a mealy odor and taste. The spore print is white and the gills are pink at maturity, which can lead to possible confusion with species of the genus Pluteus. M. galericulata mushrooms grow mostly in clusters on the well-decayed stumps of deciduous and coniferous trees from spring to autumn. The species can generally be considered inedible. It is common and widespread in the entire temperate zone of the Northern Hemisphere, but it has also been reported from Africa.

<i>Atheniella adonis</i> Species of fungus

Atheniella adonis, which has the recommended name of scarlet bonnet in the UK, is a species of agaric in the family Cyphellaceae. Found in Asia, Europe, and North America, it produces small orangish to reddish mushrooms with caps up to 1.2 cm (0.5 in) in diameter and thin pinkish-white stems reaching 4 cm (1.6 in) long. The fungus typically grows in conifer woods and peat bogs, suggesting a preference for acidic environments. The appearance of several atypical fruitings on deciduous wood in the Netherlands in the late 1970s was attributed to increases in atmospheric pollution that raised the acidity of the wood substrate.

<i>Mycena inclinata</i> Species of fungus

Mycena inclinata, commonly known as the clustered bonnet or the oak-stump bonnet cap, is a species of mushroom in the family Mycenaceae. The doubtfully edible mushroom has a reddish-brown bell-shaped cap up to 4.5 cm (1.8 in) in diameter. The thin stem is up to 9 cm (3.5 in) tall, whitish to yellow-brown at the top but progressively becoming reddish-brown towards the base in maturity, where they are covered by a yellowish mycelium that can be up to a third of the length of the stem. The gills are pale brown to pinkish, and the spore print is white. It is a widespread saprobic fungus, and has been found in Europe, North Africa, Asia, Australasia, and North America, where it grows in small groups or tufts on fallen logs and stumps, especially of oak. British mycologist E.J.H. Corner has described two varieties of the mushroom from Borneo. Lookalike species with which M. inclinata may be confused include M. galericulata and M. maculata.

<i>Mycena leptocephala</i> Species of fungus

Mycena leptocephala, commonly known as the nitrous bonnet, is a species of fungus in the family Mycenaceae. The mushrooms have conical grayish caps that reach up to 3 cm (1.2 in) in diameter, and thin fragile stems up to 5 cm (2.0 in) long. The gills are gray and distantly spaced. The spores are elliptical, typically measure 7–10 by 4–6 μm, and are white in deposit. When viewed under a light microscope, the gills have abundant spindle-shaped cystidia on the gill edges, but few on the gill faces. The mushroom is found in North America, Asia, and Europe where it grows singly or in groups on conifer needles, cones and sticks on the forest floor. It has a distinctive odor of bleach; the edibility is unknown. Similar species include Mycena alcalina, M. austera, and M. brevipes.

<i>Mycena vitilis</i> Species of fungus

Mycena vitilis, commonly known as the snapping bonnet, is a species of inedible mushroom in the family Mycenaceae. It is found in Europe and North America, where it grows on the ground among leaves in damp places, especially under alder. The small pale gray to whitish fruit bodies are usually attached to small sticks buried in the leaves and detritus. They are distinguished by their long, slender stems that root into the ground, and by the grooved cap that reaches diameters of up to 2.2 cm (0.9 in). The grayish-white gills on the underside of the cap are distantly spaced, and adnately attached to the stem. M. vitilis contains strobilurin B, a fungicidal compound with potential use in agriculture.

<i>Mycena sanguinolenta</i> Species of fungus

Mycena sanguinolenta, commonly known as the bleeding bonnet, the smaller bleeding Mycena, or the terrestrial bleeding Mycena, is a species of mushroom in the family Mycenaceae. It is a common and widely distributed species, and has been found in North America, Europe, Australia, and Asia. The fungus produces reddish-brown to reddish-purple fruit bodies with conic to bell-shaped caps up to 1.5 cm (0.6 in) wide held by slender stipes up to 6 cm (2.4 in) high. When fresh, the fruit bodies will "bleed" a dark reddish-purple sap. The similar Mycena haematopus is larger, and grows on decaying wood, usually in clumps. M. sanguinolenta contains alkaloid pigments that are unique to the species, may produce an antifungal compound, and is bioluminescent. The edibility of the mushroom has not been determined.

<i>Mycena pura</i> Species of fungus

Mycena pura, commonly known as the lilac mycena, lilac bonnet, is a species of mushroom in the family Mycenaceae. First called Agaricus prunus in 1794 by Christian Hendrik Persoon, it was assigned its current name in 1871 by German Paul Kummer. Mycena pura is known to bioaccumulate the element boron.

<i>Panellus stipticus</i> Species of fungus in the family Mycenaceae found in Asia, Australia, Europe, and North America

Panellus stipticus, commonly known as the bitter oyster, the astringent panus, the luminescent panellus, or the stiptic fungus, is a species of fungus. It belongs in the family Mycenaceae, and the type species of the genus Panellus. A common and widely distributed species, it is found in Asia, Australia, Europe, and North America, where it grows in groups or dense overlapping clusters on the logs, stumps, and trunks of deciduous trees, especially beech, oak, and birch. During the development of the fruit bodies, the mushrooms start out as tiny white knobs, which, over a period of one to three months, develop into fan- or kidney-shaped caps that measure up to 3 cm (1.2 in) broad. The caps are orange-yellow to brownish, and attached to the decaying wood by short stubby stalks that are connected off-center or on the side of the caps. The fungus was given its current scientific name in 1879, but has been known by many names since French mycologist Jean Bulliard first described it as Agaricus stypticus in 1783. Molecular phylogenetic analysis revealed P. stipticus to have a close genetic relationship with members of the genus Mycena.

<i>Mycena epipterygia</i> Species of fungi

Mycena epipterygia is a species of fungus in the family Mycenaceae of mushrooms commonly found in Europe. It is commonly known as yellowleg bonnet or yellow-stemmed mycena. The species is saprotrophic and its appearance is quite variable. For example, a number of members of the genus Mycena, some parts of the fungus are bioluminescent, including in this species, the mycelium. Mycena nivicola has been suggested as a separate species name for the Western variety.

<i>Hygrophorus eburneus</i> Species of fungus

Hygrophorus eburneus, commonly known as the ivory waxy cap or the cowboy's handkerchief, is a species of edible mushroom in the waxgill family of fungi. It is widespread in Europe and North America, and has also been collected in northern Africa. The fruit bodies are medium-sized, pure white, and when wet are covered in a layer of slime thick enough to make the mushroom difficult to pick up. The gills are broadly attached to the stem or running down it; as the family name suggests, they feel waxy when rubbed between the fingers. Like all Hygrophorus species, the fungus is mycorrhizal—a symbiotic association whereby the underground fungal mycelia penetrate and exchange nutrients with tree roots. They are common in a variety of forest types, where they grow on the ground in thickets or grassy areas. Hygrophorus eburneus is the type species of the genus Hygrophorus. A number of biologically active chemicals have been purified from the fruit bodies of the fungus, including fatty acids with bactericidal and fungicidal activity.

<i>Mycena stylobates</i> Species of fungus

Mycena stylobates, commonly known as the bulbous bonnet, is a species of inedible mushroom in the family Mycenaceae. Found in North America and Europe, it produces small whitish to gray fruit bodies with bell-shaped caps that are up to 15 mm (0.6 in) in diameter. The distinguishing characteristic of the mushroom is the fragile stipe, which is seated on a flat disk marked with distinct grooves, and fringed with a row of bristles. The mushrooms grow in small troops on leaves and other debris of deciduous and coniferous trees. The mushroom's spores are white in deposit, smooth, and ellipsoid-shaped with dimensions of 6–10 by 3.5–4.5 μm. In the development of the fruit body, the preliminary stipe and cap structures appear at the same time within the primordium, and hyphae originating from the stipe form a cover over the developing structures. The mycelia of the mushroom is believed to have bioluminescent properties.

<i>Pholiota squarrosa</i> Species of fungus

Pholiota squarrosa, commonly known as the shaggy scalycap, the shaggy Pholiota, or the scaly Pholiota, is a species of mushroom in the family Strophariaceae. Common in North America and Europe, it is a secondary parasite, in that it attacks trees that have already been weakened from prior injury or infection by bacteria or other fungi. It has a wide range of hosts among deciduous trees, although it can also infect conifers. It can also live as a saprobe, deriving nutrients from decomposing wood.

<i>Mycena maculata</i> Species of fungus in the family Mycenaceae

Mycena maculata, commonly known as the reddish-spotted Mycena, is a species of fungus in the family Mycenaceae. The fruit bodies, or mushrooms, have conic to bell-shaped to convex caps that are initially dark brown but fade to brownish-gray when young, reaching diameters of up to 4 cm. They are typically wrinkled or somewhat grooved, and have reddish-brown spots in age, or after being cut or bruised. The whitish to pale gray gills also become spotted reddish-brown as they mature. The stem, up to 8 cm (3 in) long and covered with whitish hairs at its base, can also develop reddish stains. The mycelium of M. maculata has bioluminescent properties. The saprobic fungus is found in Europe and North America, where it grows in groups or clusters on the rotting wood of both hardwoods and conifers. The edibility of the fungus is unknown. Although the species is known for, and named after its propensity to stain reddish, occasionally these stains do not appear, making it virtually indistinguishable from M. galericulata.

<i>Mycena aurantiomarginata</i> Species of fungus in the family Mycenaceae common in Europe and North America

Mycena aurantiomarginata, commonly known as the golden-edge bonnet, is a species of agaric fungus in the family Mycenaceae. First formally described in 1803, it was given its current name in 1872. Widely distributed, it is common in Europe and North America, and has also been collected in North Africa, Central America, and Japan. The fungus is saprobic, and produces fruit bodies (mushrooms) that grow on the floor of coniferous forests. The mushrooms have a bell-shaped to conical cap up to 2 cm in diameter, set atop a slender stipe up to 6 cm long with yellow to orange hairs at the base. The fungus is named after its characteristic bright orange gill edges. A microscopic characteristic is the club-shaped cystidia that are covered with numerous spiky projections, resembling a mace. The edibility of the mushroom has not been determined. M. aurantiomarginata can be distinguished from similar Mycena species by differences in size, color, and substrate. A 2010 publication reported the discovery and characterization of a novel pigment named mycenaaurin A, isolated from the mushroom. The pigment is responsible for its color, and it has antibiotic activity that may function to prevent certain bacteria from growing on the mushroom.

<i>Mycena chlorophos</i> Species of agaric fungus in the family Mycenaceae

Mycena chlorophos is a species of agaric fungus in the family Mycenaceae. First described in 1860, the fungus is found in subtropical Asia, including India, Japan, Taiwan, Polynesia, Indonesia, and Sri Lanka, in Australia, and Brazil. Fruit bodies (mushrooms) have pale brownish-grey sticky caps up to 30 mm (1.2 in) in diameter atop stems 6–30 mm (0.2–1.2 in) long and up to a millimeter thick. The mushrooms are bioluminescent and emit a pale green light. Fruiting occurs in forests on fallen woody debris such as dead twigs, branches, and logs. The fungus can be made to grow and fruit in laboratory conditions, and the growth conditions affecting bioluminescence have been investigated.

<i>Mycena purpureofusca</i> Species of fungus

Mycena purpureofusca, commonly known as the purple edge bonnet, is a species of agaric fungus in the family Mycenaceae. First described by Charles Horton Peck in 1885, the species is found in Europe and North America, where it grows on the decaying wood and debris of conifers, including cones. Fruit bodies have conical to bell-shaped purple caps up to 2.5 cm (1 in) set atop slender stipes up to 10 cm (4 in) long. The mushroom is named for the characteristic dark greyish-purple color of its gill edges. In the field, M. purpureofusca mushrooms can usually be distinguished from similar species by characteristics such as the dark purple gill edges, the deep purple cap center, and its cartilagineous consistency. The fungus contains a laccase enzyme that has been investigated scientifically for its potential to detoxify recalcitrant industrial dyes used in textile dyeing and printing processes.

References

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