Leucocoprinus birnbaumii

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Leucocoprinus birnbaumii
Leucocoprinus birnbaumii growing on potting mix.jpg
Leucocoprinus birnbaumii 56048.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Leucocoprinus
Species:
L. birnbaumii
Binomial name
Leucocoprinus birnbaumii
(Corda) Singer (1962)
Synonyms [1]
Species synonymy

Leucocoprinus birnbaumii, commonly known as the flower pot parasol, yellow parasol, [2] flowerpot parasol, or plantpot dapperling, is a species of gilled mushroom in the family Agaricaceae. It is common in the tropics and subtropics. However, in temperate regions, it frequently occurs in greenhouses and flowerpots, hence its common names of flowerpot parasol and plantpot dapperling. It is considered to be toxic if consumed. [3]

Contents

Leucocoprinus birnbaumii
Information icon.svg
Gills icon.png Gills on hymenium
Ovate cap icon.svgUmbonate cap icon.svg Cap is ovate or umbonate
Free gills icon2.svg Hymenium is free
Ring stipe icon.svg Stipe has a ring
Transparent spore print icon.svg
 Spore print is white
Saprotrophic fungus.svgEcology is saprotrophic
Mycomorphbox Poison.pngEdibility is poisonous

Taxonomy

The species was first described as Agaricus luteus in 1788 [4] by the English mycologist James Bolton who described an observation from a hothouse near Halifax, three years earlier in 1785. [5] Bolton also provided an illustration of the mushrooms. [6] At the time gilled species were classified as Agaricus and luteus comes from the Latin for yellow or yellow-orange. [7] Bolton suggested the common name of 'Yellow Cottony Agaric' in reference to the soft, scaly texture of the mushroom. [5]

However the name A. luteus had already been used to describe an unrelated Russula species and was published in 1778 by William Hudson [8] so Bolton's A. luteus was illegitimate.

Nonetheless Agaricus luteus continued to be used and in James Sowerby's 1796 book entitled 'Coloured figures of English fungi or mushrooms' his description of Agaricus cepaestipes (now Leucocoprinus cepistipes ) also includes A. luteus and A. cretaceus (now Leucocoprinus cretaceus ) which he considered to be 'undoubtedly the same species', only differing in colour. [9] So whilst his illustration of L. birnbaumii is intricately drawn, coloured and immediately recognisable today it rather confusingly has the yellow and white species side by side. [10]

Sowerby writes that his observations of this species were made in bark beds around London where he described its presence as 'not uncommon'. He does not explicitly state that the observations were made in greenhouses however he does note that the yellow mushrooms were observed at Sir Abraham Hume's Wormleybury manor. During this period exotic plants from the East Indies and India were being cultivated in greenhouses and stove-heated hothouses at Wormleybury making it likely that this is where the mushrooms were found. [11] This may give an indication as to where the fungi observed originated from.

In 1897 the French mycologist Julien Godfrin described the species as sulphur yellow in colour and classified it as Lepiota lutea. [12] [13] Many popular North American books continued to use this name until the 1980s and it still occasionally arises today. [14] [15]

In 1839 the Czech mycologist August Corda described the same species from Prague where it was found growing in a greenhouse in between pineapple plants by a garden inspector named Birnbaum and so he called it Agaricus Birnbaumii. [16] [17] Corda said the greenhouse was in Count Salm's garden in Prague [18] and Karel Cejp says the Salmovský gardens [19] which was created by count Hugo František Salm  [ cs ] behind house 506 in the New Town (Novém Městě) on what is today Salmovská street. [20] The garden gradually declined after 1868 when the land was used for new development [21] but pineapples are still grown in the greenhouses in the gardens of what is today the Prague castle complex which also encompasses the Salm Palace (Czech: Salmovský palác). [22] As this species is adept at spreading via potting soil and with transplanted plants it is possible that descendants of the mushrooms found by Mr. Birnbaum continue to grow amongst them.

The French mycologist Marcel Locquin classified it as Leucocoprinus luteus in 1945 [23] and the German mycologist Rolf Singer reclassified it as Leucocoprinus birnbaumii in 1962. [24]

English names

In the UK, Leucocoprinus birnbaumii has been given the recommended common name of "plantpot dapperling". [25] In North America, it has also been called the "yellow parasol", [14] "flowerpot parasol", [14] "yellow houseplant mushroom", [26] "lemon-yellow lepiota", [15] or "yellow pleated parasol". [27]

Description

Leucocoprinus birnbaumii is a small, yellow dapperling mushroom which is frequently found in plant pots and greenhouses. The fruit bodies of Leucocoprinus birnbaumii are agaricoid (mushroom-shaped) and occur singly or in small clumps.

Cap: 2–7.5 cm wide in maturity, starting bulbous to cylindrical before expanding to hemispherical or conical and flattening or sometimes appearing umbonate with age. The surface is lemon yellow to sulphur yellow, smooth or slightly powdery and covered in ragged, fibrous scales which are easily removed. The scales are darker yellow or brownish with age and more densely concentrated towards the centre disc where they often form a patch whilst at the edges they are sparser. The cap edges are striated and grooved (sulcate-striate) with a paler colour present in the grooves whilst the edges curl inwards when young before curving out with age or straightening. The cap flesh is firm when young but becomes softer and more fragile with age, it is a dull whitish colour. Gills: Free and often quite remote from the stem, sulphur yellow, with spacing that can vary from crowded to subdistant at up to 4mm wide. With age the gills may bulge in the middle (ventricose) and the edges can be fringed. Stem: 2.5–9 cm long and 2-6mm thick at the top tapering to a bulbous or club shaped base which is 4-15mm thick. The interior is hollow but pithy with a shiny white colour whilst the exterior surface is lemon yellow to sulphur yellow and may discolour brownish with age. It is covered in fine powdery or woolly scales (pruinose to floccose-squamulose) across the full length starting from just above the base. The thin, membranous stem ring is located anywhere between the top and bottom of the stem (superior to inferior) and is movable. The top surface of it is yellow whilst the underside is whitish however the ring is evanescent and may disappear. Spore print: White. Spores: Ellipsoid to amygdaliform with a large germ pore. Dextrinoid. The average size range is 7.7-10.5 x 5.9-7.3 μm. Smell: Indistinct or sometimes mushroomy. Taste: Indistinct. [28] [29] When dry the mushroom may discolour tan or brownish and a similar brown colour is seen in caps of aborted mushroom pins which fail to grow.

Sclerotia

One feature of Leucocoprinus birnbaumii which isn't often described but is frequently visible are the sclerotia amongst the mycelium on the surface of the soil, which is an unusual trait amongst members of the Agaricales . [30] The Italian mycologist Oreste Mattirolo described sclerotia in Lepiota flos-sulphuris in 1917 as well as in a species which he described as Lepiota incerta. [31] In 1948 by the Czech mycologist Karel Cejp reclassified these species as Leucocoprinus flos-sulphuris and Leucocoprinus flos-sulphuris var. incerta, with both now regarded as synonyms of L. birnbaumii. [19] Cejp also cites an earlier description of the sclerotia by the German mycologist Paul Christoph Hennings in 1898 who noted sclerotia in the hothouses of Heinrich Hildmann's cacti gardens in Birkenwerder. However due to the confusion in the early taxonomy of Leucocoprinus species Hennings describes them as belonging to L. cepaestipes, despite describing the mushrooms as golden yellow. Hennings describes the sclerotia as small (barely 1mm), light yellow and felt-like, with them covering entire areas of plant pots and beds. Hennings concludes that the species was likely introduced from South America citing specimens of sclerotia in the Berlin herbarium that were collected from Guadeloupe. [32] Hennings compares them to Sclerotium mycetospora, which was described in 1822 by Elias Magnus Fries as being like mustard seeds which were white, furry and spread gregariously amongst the bark in a hothouse where they appeared to favour the light. [33]

Typically sclerotia are most often discussed in the context of truffles or in the challenges faced by attempts at morel cultivation [34] so are usually associated with large, hardened masses growing under the ground. The sclerotia in L. birnbaumii however are tiny (500-820 μm) hard, elliptical masses on top of the soil amongst the fibrous mycelium which have been described as whitish-beige or pale yellowish white. These have been shown to be genetically identical to the developed mushroom [35] and have previously been cultured to produce mushrooms by introducing them to a substrate of sterilised wheat chaff before introducing the subsequently developed mycelium to a sand, peat, soil and sphagnum moss mix to ultimately fruit. [36] Whilst L. birnbaumii itself is harmless to plants the sclerotia can have economic impacts on the production and sale of Orchids which often have transparent root pots where the sclerotia can collect. Their presence in these containers can reduce the aesthetic value of the plants and have impacts on the water retention of the substrate. [37] Previous studies have noted an apparent propensity for L. birnbaumii to grow amongst Orchids. [38]

Habitat and distribution

Like all Leucocoprinus species, L. birnbaumii is a saprotroph, living on very decayed plant matter (humus or compost). The fungus is common throughout the tropics and subtropics, extending into warmer parts of the temperate zones. Rarely, it appears in cooler areas, fruit bodies having been recorded as far north as England, [39] but these seem to be temporary introductions. In these areas (such as North America, Europe, and Australia) it is more usually found in hothouses and plant pots than in the wild. [40] [26] [38]

iNaturalist suggests that the mushrooms are most commonly observed in the Summer with a peak in July or August, [41] whilst the observations on this site are not always reliable due to misidentification, this seasonality is to be expected from a tropical species that has been introduced into temperate climates. The iNaturalist seasonality chart for L. birnbaumii also closely resembles the monthly pageviews for this species on Wikipedia. [42] The higher number of views this page receives during the summer is suggestive of more people finding these mushrooms in their plant pots and trying to learn what they are whereas for native, wild species the views on their pages tend to peak during the Autumn months when they occur. These sources can only provide an estimation of seasonality in domestic settings and are not an indication of the seasonality in the tropical environments in which it is native.

In a 1907 study the American mycologist Andrew Price Morgan documented Lepiota lutea growing in greenhouses in Columbus, Ohio. [43]

In 2019 a study documented L. birnbaumii growing from the stump of a dead lemon tree in an orchard near Damietta, Egypt during the Autumn. [44]

Similar species

Toxicity

Leucocoprinus birnbaumii is a toxic mushroom. If eaten it can cause stomach upset as its toxic mechanism is a gastrointestinal irritant. [3] [47] [48] North Carolina State University classifies the species as having medium severity poison characteristics [49] whilst the University of Massachusetts Amherst say that the level of toxicity is simply unknown at present. [50] These mushrooms should not be eaten.

Chemistry

The yellow color of the mushrooms is from alkaloids known as birnbaumins. Birnbaumin B is the major compound and has a formula C16H20N6O5 whilst birnbaumin A has one less oxygen molecule. Extraction methods used to isolate these compounds also yield L-tryptophan, a common amino acid which helps build proteins. [51]

A 2015 study succeeded in isolating a number of fatty acids from Leucocoprinus birnbaumii which showed moderate but selective anti-microbial effects. Three fatty acid compounds were isolated and tested against six microorganisms. Of them, linoleic acid displayed some inhibition against Streptococcus pyogenes and less against Staphylococcus aureus , oleic acid had some inhibition of Pseudomonas aeruginosa whilst methyl linoleate had limited inhibition against all three bacteria species. They did not show any results against the other two bacteria they were tested against (E. coli and MRSA) or against the pathogenic yeast strain Candida albicans . [52]

Relationship with potted plants

Leucocoprinus birnbaumii is a common find in greenhouses and potted plants all over the world having been spread by human activity. [53] When Europeans started exploring the tropics and bringing back exotic plant species for study or cultivation they were unwittingly bringing fungal hitchhikers back with them in the soil. The original classification of this species from a greenhouse in England in the late 1700s [54] and the observation from the early 1800s [17] in Prague which gave it the name birnbaumii demonstrate how long this species has been present in Europe. Despite this tropical species likely being unable to survive in these countries in the wild due to the cold temperatures it continues to spread via human activity. The heat and humidity of greenhouses or indoor plant pots evidently creates a habitat in which this species can thrive with garden centres and nurseries serving as hubs to distribute L. birnbaumii all over Europe. Botanical gardens may serve as another means of spreading as visitors unknowingly collect spores on their clothes and bring them into their homes. [40]

However, when L. birnbaumii mushrooms suddenly appear in a plant pot which had shown no previous signs of them it doesn't mean the fungus has only just been introduced. Due to the length of time the mycelium requires to grow, it is more likely that the fungus was always present in the soil from the moment the plant (or compost used) was acquired and that the conditions for it to fruit have only recently been met. Mushroom production will occur when the moisture content of the soil and humidity of the air is adequate. Even when no mushrooms are visible the fungus may still be alive and thriving in the soil waiting for the next opportunity to fruit.

As a saprotrophic species L. birnbaumii is harmless to plants. The presence of this fungus in the soil may serve to improve the quality of it as it can help to break down organic matter and provide nutrients that the plants require. [48] However, if the mushrooms are appearing regularly it can be a sign that the soil is too moist and that the plant may be being over-watered. Whilst L. birnbaumii itself is harmless to plants, the high moisture conditions in which it fruits can invite a host of other fungi and mold species which may harm the plant and result in root rot. In this regard L. birnbaumii can serve as a useful indicator to help ensure plants remain healthy. [55]

Related Research Articles

<i>Leucocoprinus</i> Genus of fungi

Leucocoprinus is a genus of fungi in the family Agaricaceae. Its best-known member is the distinctive yellow mushroom Leucocoprinus birnbaumii, which is found in plant pots and greenhouses worldwide. The type species is Leucocoprinus cepistipes. The genus has a widespread distribution and contains over 80 recognised species, however many of these species are very scarcely recorded and little known with only a small number of Leucocoprinus species which are commonly observed. The majority of the species in this genus are exclusive to tropical environments however numerous species have become a common sight in plant pots and greenhouses resulting in them becoming well known worldwide.

<i>Leucocoprinus cepistipes</i> Species of fungus

Leucocoprinus cepistipes, is a species of fungus in the family Agaricaceae. It is also know by the common name onion-stalk parasol in reference to the bulbous stem base. It is typically found on wood debris, such as wood chips but may also grow in potted plants or greenhouses. Typical characteristics include a fine-scaled bell-shaped cap, a partial veil, and a tendency to bruise a yellow to brown when handled.

<i>Leucocoprinus fragilissimus</i> Species of fungus

Leucocoprinus fragilissimus, commonly known as the fragile dapperling, is a species of gilled mushroom in the family Agaricaceae.

<i>Lepiota cristata</i> Species of fungus

Lepiota cristata, commonly known as the stinking dapperling, brown-eyed parasol, or the stinking parasol, is an agaric and possibly poisonous mushroom in the family Agaricaceae. A common and widespread species—one of the most widespread fungi in the genus Lepiota—it has been reported from Europe, northern Asia, North America, and New Zealand. It fruits on the ground in disturbed areas, such as lawns, path and road edges, parks, and gardens. The species produces fruit bodies characterized by the flat, reddish-brown concentric scales on the caps, and an unpleasant odour resembling burnt rubber. Similar Lepiota species can sometimes be distinguished from L. cristata by differences in cap colour, stipe structure, or odour, although some species can only be reliably distinguished through the use of microscopy.

<i>Leucocoprinus cretaceus</i> Species of fungus

Leucocoprinus cretaceus is a species of mushroom producing fungus in the family Agaricaceae. It is likely tropical in origin although it was first documented in Europe where it was often found growing in greenhouses and bark beds. However many early observations conflate this species with Leucocoprinus birnbaumii or Leucocoprinus cepistipes despite sharing only some superficial similarities. This fungus is quite versatile even for a saprotroph and is often found growing in clusters on woodchips, sawdust and compost heaps as well as directly from the ground or on trees. It may also appear in plant pots and greenhouses in colder countries in which it is not well equipped to survive outside.

<i>Leucocoprinus ianthinus</i> Species of fungus

Leucocoprinus ianthinus is a species of mushroom producing fungus in the family Agaricaceae. Like several other Leucocoprinus species it may have originated in a tropical climate but now finds a home in plant pots, greenhouses and compost piles in many countries. It is not seen in plant pots with the same kind of regularity as the well known Leucocoprinus birnbaumii and not seen in the wild as frequently as Leucocoprinus brebissonii.

Leucocoprinus straminellus is a species of mushroom producing fungus in the family Agaricaceae. Like other Leucocoprinus species it may have originated in a tropical climate but now finds a home in plant pots, greenhouses and compost piles in many countries. Leucocoprinus straminellus is described as being similar to the more commonly known Leucocoprinus birnbaumii but it is smaller and a lighter shade of yellow with smaller spores that lack a germ pore. It is also described as being superficially similar to Leucocoprinus fragilissimus but slightly more robust with flesh that is less translucent.

Leucocoprinus flavescens is a species of mushroom-producing fungus in the family Agaricaceae.

<i>Leucocoprinus brunneoluteus</i> Species of fungus

Leucocoprinus brunneoluteus is a species of mushroom producing fungus in the family Agaricaceae.

<i>Leucoagaricus meleagris</i> Species of fungus

Leucoagaricus meleagris is a species of fungus in the family Agaricaceae.

Leucocoprinus tricolor is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus biornatus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus holospilotus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus citrinellus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus velutipes is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus zeylanicus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus tenellus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus martinicensis is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus inflatus is a species of mushroom producing fungus in the family Agaricaceae.

Leucocoprinus russoceps is a species of mushroom producing fungus in the family Agaricaceae.

References

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  49. ↑ "Leucocoprinus birnbaumii (Flowerpot Parasol, Lemon-Yellow-Lepiota, Plantpot Dapperling, Yellow Houseplant Mushroom, Yellow Pleated Parasol) | North Carolina Extension Gardener Plant Toolbox".
  50. ↑ jdlanier (2021-09-03). "Greenhouse Updates: September 3, 2021". Center for Agriculture, Food, and the Environment. Retrieved 2022-07-13.
  51. ↑ Bartsch, Andrea; Bross, Monika; Spiteller, Peter; Spiteller, Michael; Steglich, Wolfgang (2005-05-06). "Birnbaumin A and B: Two Unusual 1-Hydroxyindole Pigments from the "Flower Pot Parasol" Leucocoprinus birnbaumii". Angewandte Chemie International Edition. 44 (19): 2957–2959. doi: 10.1002/anie.200500082 . ISSN   1433-7851. PMID   15818629.
  52. ↑ Brkljača, Robert; Urban, Sylvia (2014-05-01). "Rapid Dereplication and Identification of the Bioactive Constituents from the Fungus, Leucocoprinus birnbaumii". Natural Product Communications. 10 (1): 1934578X1501000. doi: 10.1177/1934578x1501000124 . ISSN   1934-578X. S2CID   19265437.
  53. ↑ "Observations - Leucocoprinus birnbaumii". iNaturalist. Retrieved 2022-07-12.
  54. ↑ Bolton, James (1788). An history of fungusses, growing about Halifax. Vol. 2. Huddersfield, UK: self-published. p. 50.
  55. ↑ "Are Mushrooms Bad for Houseplants? - Indoor Plants for Beginners". 2021-06-29. Retrieved 2022-07-13.
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