Tricholoma vernaticum

Last updated

Tricholoma vernaticum
Tricholoma vernaticum 42749.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Tricholomataceae
Genus: Tricholoma
Species:
T. vernaticum
Binomial name
Tricholoma vernaticum
Shanks (1996)
Synonyms [1]
Tricholoma vernaticum
Information icon.svg
Gills icon.png Gills on hymenium
Convex cap icon.svgFlat cap icon.svg Cap is convex or flat
Adnate gills icon2.svg Hymenium is adnate
Ring stipe icon.svg Stipe has a ring
Transparent spore print icon.svg
Spore print is white
Mycorrhizal fungus.svgEcology is mycorrhizal
Mycomorphbox Question.pngEdibility is unknown

Tricholoma vernaticum is an agaric fungus of the genus Tricholoma native to the Pacific Northwest region of the United States. The fungus was originally described in 1976 as a species of Armillaria when that genus was more inclusive; it received its current name twenty years later. The stout fruit bodies (mushrooms) have moist white to grayish caps (later becoming grayish-brown with age), a membranous ring on the stipe, and an odor resembling cucumbers. Mycorrhizal with conifers, the fungus fruits in the spring or early summer, with its mushrooms appearing on the ground singly or in groups at high elevations, often at the edge of melting snowbanks. The edibility of the mushroom is unknown, but it has a strong unpleasant odor and a mealy taste.

Contents

Taxonomy

The species was originally described from California as Armillaria olida by mycologists Harry D. Thiers and Walter Sundberg in 1976. The type specimen was collected on May 6, 1972, in the Crystal Basin Recreation Area in El Dorado County. Thiers and Sundberg classified it in the section Ponderosa of genus Armillaria due to its inamyloid spores, but noted that its relationship to other species was unclear. They also noted the similarity of the form and color of its cap to species in section Constricta of genus Lyophyllum . [2]

Thiers and Sundberg used a broad species concept of Armillaria, including species with a white spore print, gills attached to the stipe, and a ring formed from a partial veil, regardless of their ecological preferences. Today, Armillaria is restricted to wood-rotting species that form black rhizomorphs, and several mycorrhizal former Armillaria have since been transferred to Tricholoma . The name Tricholoma olida was unavailable for this species, because it was previously used in 1920 by Josef Velenovský, [3] so Kris Shanks proposed the new name T. vernaticum. The specific epithet refers to its growth in the spring. [4] The previous epithet olida derives from the Latin olidum, meaning "stinking" or "smelling". [5]

Tricholoma vernaticum is classified in the subgenus Contextocutis of the genus Tricholoma on account of its clamp connections and interwoven hyphae in the cap cuticle. [4]

Description

The whitish gills are thick and closely spaced, sometimes developing pale pink tints. Tricholoma vernaticum 42750.jpg
The whitish gills are thick and closely spaced, sometimes developing pale pink tints.

The cap is convex to broadly convex before flattening out in age, and reaches diameters between 5 and 17 cm (2 and 6.5 in) wide. The surface is dry to moist, smooth, and in maturity appears to be made of flattened fibers arranged radially. As the mushroom ages, the cap color changes from white to fuscous (dusky brownish grey) or brown, usually with olive, grayish or pale tan regions. The cap margin, initially curved downward, lifts up and becomes lobed or irregular with age. The flesh is thick and white, with a strongly farinaceous odor similar to cucumber or watermelon rind. Gills initially have an emarginate (notched) to adnate attachment to the stipe, but pull away as the mushroom matures to become seceding or almost free from attachment. They are thick and closely spaced, and whitish in color, sometimes developing pale pink tints. The solid stipe measures 4–14 cm (1.6–5.5 in) long by 1.3–4 cm (0.5–1.6 in) thick, and is either equal in width through its length or bulged at the base. [6] It has a dry surface, and a texture that is smooth to silky fibrillose above the ring, and appressed fibrillose to scaly below the ring. The ring, located in the middle to upper half of the stem, is sometimes inconspicuous. The edibility of the mushroom is unknown with certainty, [7] although it has been noted to have a strongly farinaceous taste, and an unpleasant odor "strongly reminiscent of rotting white potatoes." [2]

Spores are roughly elliptical. Tricholoma vernaticum 145713.jpg
Spores are roughly elliptical.

The spore print is white. Spores are elliptic (or narrowly so), and measure 8–12 by 4.8–6.2  µm. There are clamp connections present in the hyphae. [7] The basidia (spore-bearing cells) are four-spored, club-shaped, and measure 23–30 by 8–10 µm. The hymenium lacks cystidia. The cap flesh comprises homogenous, interwoven hyphae that are 3–5 µm in diameter, while the cap cuticle is a 200–300-micrometer thick layer of interwoven, gelatinous hyphae up to 4 µm in diameter. [2]

Similar species

When collected in its typical habitat and during the appropriate season, Tricholoma vernaticum mushrooms can be readily identified because of their prominent characteristics: white color, stocky fruit body, farinaceous odor, and ring on the stipe. Tricholoma lookalikes in the same geographic region grow at lower elevations, typically in autumn. T. portentosum has a gray cap, a stipe with yellow tints, and lacks a ring, while T. mutabile has violet tones in its cap and also lacks a ring. Other lookalikes include Hygrophorus subalpinus and H. camarophyllus , but these species have broad, waxy gills, and lack the characteristic odor of T. vernaticum. [7]

Habitat and distribution

Fruit bodies of Tricholoma vernaticum grow singly or in groups under conifers in late spring and early summer. A fairly common species throughout its range, it is found at high elevations in California north to Oregon and Washington. [7] It is a snowbank fungus, meaning it is commonly found at the edge of melting snowbanks. [6] Fruit bodies are often buried under humus, [2] forming hardly visible "mushrumps", apparent only as cracked bumps on the ground. [7]

See also

Related Research Articles

<i>Amanita gemmata</i> Species of fungus

Amanita gemmata, commonly known as the gemmed amanita or the jonquil amanita, is an agaric mushroom of the family Amanitaceae and genus Amanita. The fruit body has a cap that is a dull to golden shade of yellow, and typically 2.5–12 centimetres in diameter. The cap surface is sticky when moist, and characterized by white warts, which are easily detached. It is initially convex, and flattens out when mature. The flesh is white and does not change colour when cut. The gills are white and closely spaced. The stem is pale yellow, and measures 4–12 cm long by 0.5–1.9 cm thick. The partial veil that covers the young fruit body turns into the ring on the stem at maturity. The spore print is white. It resembles numerous other species.

<i>Psilocybe fimetaria</i> Species of fungus

Psilocybe fimetaria is a psilocybin mushroom, having psilocybin and psilocin as main active compounds. It grows exclusively on horse and cow dung.

Psilocybe liniformans var. americana, is a psilocybin mushroom in the family Hymenogastraceae. It is in the section Semilanceatae of Psilocybe and has psilocybin as its main active compound.

<i>Crepidotus versutus</i> Species of fungus

Crepidotus versutus, commonly known as the evasive agaric, is a species of fungus in the family Crepidotaceae. It is saprobic on wood, like other Crepidotus species, but it can also decompose herbaceous forest litter. The species is characterized by large, punctate, ellipsoid spores, and the white, hairy pileus.

<i>Helvella elastica</i> Species of fungus

Helvella elastica, commonly known as the flexible Helvella, or the elastic saddle, is a species of fungus in the family Helvellaceae of the order Pezizales. It is found in Asia, Europe, and North America. It has a roughly saddle-shaped yellow-brown cap atop a whitish stipe, and grows on soil in woods. Another colloquial name is the brown elfin saddle.

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

Mycena cinerella, commonly known as the mealy bonnet, is an inedible species of mushroom in the family Mycenaceae. It is found in Europe and the United States, where it grows in groups on fallen leaves and needles under pine and Douglas fir. The small grayish mushrooms have caps that are up to 1.5 cm (0.6 in) wide atop stipes that are 5 cm (2.0 in) long and 2.5 mm (0.10 in) thick. Its gills are grayish-white and adnate, with a "tooth" that runs slightly down the stipe. The fungus has both two- and four-spored basidia. As its common name suggests, it smells mealy.

<i>Leucopholiota decorosa</i> Species of fungus

Leucopholiota decorosa is a species of fungus in the mushroom family Tricholomataceae. Commonly known as the decorated pholiota, it is distinguished by its fruit body which is covered with pointed brown, curved scales on the cap and stem, and by its white gills. Found in the eastern United States, France, and Pakistan, it is saprobic, growing on the decaying wood of hardwood trees. L. decorosa was first described by American mycologist Charles Horton Peck as Agaricus decorosus in 1873, and the species has been transferred to several genera in its history, including Tricholoma, Tricholomopsis, Armillaria, and Floccularia. Three American mycologists considered the species unique enough to warrant its own genus, and transferred it into the new genus Leucopholiota in a 1996 publication. Lookalike species with similar colors and scaly fruit bodies include Pholiota squarrosoides, Phaeomarasmius erinaceellus, and Leucopholiota lignicola. L. decorosa is considered an edible mushroom.

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

Mycena overholtsii, commonly known as the snowbank fairy helmet or fuzzy foot, is a species of fungus in the family Mycenaceae. The mushrooms produced by the fungus are relatively large for the genus Mycena, with convex grayish caps up to 5 cm (2 in) in diameter and stems up to 15 cm (6 in) long. The gills on the underside of the cap are whitish to pale gray, and initially closely spaced before becoming well-spaced at maturity after the cap enlarges. The mushrooms are characterized by the dense covering of white "hairs" on the base of the stem. M. overholtsii is an example of a snowbank fungus, growing on well-decayed conifer logs near snowbanks, during or just after snowmelt. Formerly known only from high-elevation areas of western North America, particularly the Rocky Mountain and Cascade regions, it was reported for the first time in Japan in 2010. The edibility of the mushroom is unknown. M. overholtsii can be distinguished from other comparable species by differences in location, or spore size.

<i>Amanita onusta</i> Species of fungus

Amanita onusta, commonly known as the loaded Lepidella, the gunpowder Lepidella or the gunpowder amanita, is a species of fungus in the mushroom family Amanitaceae. It is characterized by its small to medium-sized fruit bodies that have white to pale gray caps crowded with roughly conical, pyramidal, or irregular gray warts. The stipe is whitish-gray with woolly or wart-like veil remnants, and at the base is a spindle- or turnip-shaped base that is rooted somewhat deeply in the soil.

<i>Suillus pungens</i> Species of fungus in the family Suillaceae found in California

Suillus pungens, commonly known as the pungent slippery jack or the pungent suillus, is a species of fungus in the genus Suillus. The fruit bodies of the fungus have slimy convex caps up to 14 cm (5.5 in) wide. The mushroom is characterized by the very distinct color changes that occur in the cap throughout development. Typically, the young cap is whitish, later becoming grayish-olive to reddish-brown or a mottled combination of these colors. The mushroom has a dotted stem (stipe) up to 7 cm (2.8 in) long, and 2 cm (0.8 in) thick. On the underside on the cap is the spore-bearing tissue consisting of minute vertically arranged tubes that appear as a surface of angular, yellowish pores. The presence of milky droplets on the pore surface of young individuals, especially in humid environments, is a characteristic feature of this species. S. pungens can usually be distinguished from other similar Suillus species by differences in distribution, odor and taste. The mushroom is considered edible, but not highly regarded.

<i>Amanita atkinsoniana</i> Species of fungus

Amanita atkinsoniana, also known as the Atkinson's amanita, is a species of fungus in the family Amanitaceae. The fruit body is white to brownish, with caps up to 12.5 centimetres in diameter, and stems up to 20 cm long. The surface of the cap is covered with brownish conical warts.

<i>Amanita ravenelii</i> Species of fungus

Amanita ravenelii, commonly known as the pinecone lepidella, is a species of fungus in the family Amanitaceae. The whitish fruit bodies are medium to large, with caps up to 17 centimetres wide, and stems up to 25 cm (10 in) long. The cap surface has large warts and the stem has a scaly, bulbous base. The mushrooms have a unique chlorine like odor.

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

Hygrophorus goetzii is a species of fungus in the family Hygrophoraceae. It is a snowbank mushroom with a rosy-pink cap that fades to cream color in maturity.

<i>Boletus rubroflammeus</i> Species of fungus

Boletus rubroflammeus is a species of bolete fungus in the family Boletaceae. First described from Michigan in 1971, it is found in the eastern United States and Mexico, where it grows in a mycorrhizal association with hardwood trees. The fruit bodies (mushrooms) of the fungus have caps that are deep red to purplish red, and dark red pores. The stem has coarse, dark red reticulations and a narrow yellow area at the top. All parts of the mushroom quickly stain blue when injured or cut. Lookalikes include Boletus flammans, a lighter-colored species that grows with conifers. Other similar species can be distinguished by differences in distribution, morphology, staining reaction, and microscopic characteristics. Boletus rubroflammeus mushrooms are poisonous, and can cause gastrointestinal distress if consumed.

<i>Tricholoma vaccinum</i> Fungus of the agaric genus Tricholoma

Tricholoma vaccinum, commonly known as the russet scaly tricholoma, the scaly knight, or the fuzztop, is a fungus of the agaric genus Tricholoma. It produces medium-sized fruit bodies (mushrooms) that have a distinctive hairy reddish-brown cap with a shaggy margin when young. The cap, which can reach a diameter of up to 6.5 cm (2.6 in) wide, breaks up into flattened scales in maturity. It has cream-buff to pinkish gills with brown spots. Its fibrous, hollow stipe is white above and reddish brown below, and measures 4 to 7.5 cm long. Although young fruit bodies have a partial veil, it does not leave a ring on the stipe.

<i>Pluteus phaeocyanopus</i> Species of fungus

Pluteus phaeocyanopus is an agaric fungus in the family Pluteaceae. Described as a new species in 2010, it has only been collected from California, where it grows singularly or in groups on the decaying wood of oak. The fruit body has a smooth brown cap measuring 2–4 cm (0.8–1.6 in) in diameter. The stipe is 2–5 cm (0.8–2.0 in) long by 0.4–0.8 cm (0.16–0.31 in) thick, and roughly equal in width throughout. It is whitish but becomes grayish-green near the base. The thin and fragile gills are free from attachment to the stipe, close to somewhat distantly placed, and interspersed with several tiers of lamellulae. The flesh has no distinctive taste or odor. The spores are spherical or nearly so and measure 6.2–8.4 by 5.7–7.9 μm.

<i>Tubaria punicea</i> Species of fungus

Tubaria punicea is a rare species of agaric fungus in the family Tubariaceae. It is found on the west coast of North America, where it grows on the bases and in hollows of madrone.

<i>Clitocybe albirhiza</i> Species of fungus

Clitocybe albirhiza, commonly known as the snowmelt clitocybe, is a species of agaric fungus in the family Tricholomataceae. It is found in high-elevation locations in the western United States.

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

Pholiota nubigena, commonly known as the gastroid pholiota or the bubble gum fungus, is a species of secotioid fungus in the family Strophariaceae. It is found in mountainous areas of the western United States, where it grows on rotting conifer wood, often fir logs. It fruits in spring, often under snow, and early summer toward the end of the snowmelt period in high mountain forests. Fruit bodies appear similar to unopened mushrooms, measuring 1–4 centimetres tall with 1–2.4 cm diameter caps that are whitish to brownish. They have a short but distinct whitish stipe that extend through the internal spore mass (gleba) of the fruit body into the cap. The gleba consists of irregular chambers made of contorted gills that are brownish in color. A whitish, cottony partial veil is present in young specimens, but it often disappears in age and does not leave a ring on the stipe.

<i>Pluteus americanus</i> Species of fungus

Pluteus americanus is a North American and Russian psychedelic mushroom that grows on hardwoods.

References

  1. "Tricholoma vernaticum Shanks, Mycologia, 88 (3): 508, 1996". MycoBank. International Mycological Association. Retrieved 2013-09-12.
  2. 1 2 3 4 Thiers HD, Sundberg WJ (1976). "Armillaria (Tricholomataceae, Agaricales) in the Western United States including a new species from California". Madroño. 23 (8): 448–53. JSTOR   41413984.
  3. Velenovský J. (1920). České houby. Vol. 2. Prague: České Botanické Společnosti. p. 241.
  4. 1 2 Shanks KM. (1996). "New species of Tricholoma from California and Oregon". Mycologia. 88 (3): 497–508. doi:10.2307/3760890. JSTOR   3760890.
  5. Gledhill D. (2008). The Names of Plants. Cambridge, UK: Cambridge University Press. p. 279. ISBN   978-0-521-86645-3.
  6. 1 2 Davis RM, Sommer R, Menge JA (2012). Field Guide to Mushrooms of Western North America. Berkeley, California: University of California Press. p. 169. ISBN   978-0-520-95360-4.
  7. 1 2 3 4 5 Bessette AE, Bessette AR, Trudell SA, Roody WC (2013). Tricholomas of North America: A Mushroom Field Guide. Austin: University of Texas Press. pp. 170–1.