Leucocoprinus birnbaumii: The Ultimate Mushroom Guide
About The Leucocoprinus birnbaumii Mushroom
The Lemon Yellow Lepiota (Leucocoprinus birnbaumii) is a little yellow parasol mushroom. It is known to be a toxic toadstool, and if eaten it can cause a very unpleasant stomach upset.
Also, know as flowerpot parasol mushroom it’s a tropical species that often found growing from the commercial potting mix.
The Leucocoprinus birnbaumii Mushroom is poisonous to dogs only in very large quantities.
Lemon yellow Lepiota
Yellow pleated parasol
Yellow spirit umbrella
Goudgele plooiparasol (Dutch)
Gelber Faltenschirmling (German)
Leucocoprinus birnbaumii Identification
Saprobic mushroom; growing alone, gregariously, or clustered in flower pots, greenhouses, and so on—or, in warm conditions, outside in gardens, lawns, and other cultivated areas (often around stumps).
Also growing in hardwood and conifer forests, especially in disturbed ground areas (path sides, etc.); outdoors in summer, indoors year-round; widely distributed in North America.
2.5–5 cm across; oval to egg-shaped when young, becoming broadly conical, broadly convex, or bell-shaped; dry; powdery to finely scaly; the margin lined or grooved nearly to the center by maturity; bright to pale yellow, often with a darker (but not brown) center.
Free from the stem; crowded; short-gills frequent; pale yellow to yellow.
3–10 cm long; 2–5 mm thick; more or less equal above a slightly swollen base; dry; bald or powdery; with a fragile, bracelet-like, yellow ring that sometimes disappears; basal mycelium pale yellow.
Flesh: Whitish to yellowish; very thin.
Spore Print: White.
Getting Rid of Leucocoprinus birnbaumii in Houseplants
The mushrooms are not known to harm plants either and likely came in with the potting soil.
Once the soil becomes infected, it is very difficult to remove the spores and fungus that causes the mushrooms, but there are a few things you can try:
Remove the caps
By removing the caps as soon as possible, you are removing the source of the spores which result in mushrooms growing in houseplant soil. This will also help keep mushrooms out of your other houseplants.
Scrape the soil
Scraping the top 2 inches of soil off the houseplants pot and replacing it may help, but the fungus may regrow and the mushrooms will return.
Change the soil
Changing the soil may possibly help with getting rid of mushrooms. One of the problems is that it is not healthy to remove all of the soil from a plant’s roots (through washing or rinsing) and the fungus may still be present and regrow from the soil left on the roots of the houseplant.
Drench the soil with a fungicide
Drenching the houseplant’s soil with a fungicide may help with eliminating mushrooms in houseplants, but again, if not all of the fungus is killed, the mushrooms will return. You may need to try this treatment several times before the fungus is killed completely.
Change the conditions
If the air is less humid, the soil-less moist or the temperature less warm, this will reduce the number of mushrooms that appear. Unfortunately, the conditions that are ideal for mushrooms are also ideal for most houseplants, so by changing the conditions, you may harm the houseplant itself.
Leucocoprinus birnbaumii Taxonomic
This attractive little mushroom was first described in 1785 by Yorkshire mycologist James Bolton, who named it Agaricus luteus - invalidly, as that epithet had already been used. (It was Bolton who between 1788 and 1790 produced the first English-language work devoted to fungi, An History of Fungusses growing about Halifax.)
In 1839 the Czech mycologist August Corda described the same species, based on specimens which had been found in a greenhouse by a garden inspector named Birnbaum - hence the specific epithet birnbaumii.
It was the German-born mycologist Rolf Singer who, in 1961, transferred this species to the genus Leucocoprinus, thus establishing its scientific name as Leucocoprinus birnbaumii.
Synonyms of Leucocoprinus birnbaumii include:
Agaricus luteus Bolton, Agaricus luteus With., Agaricus birnbaumii Corda, Lepiota lutea (Bolton) Godfrin, Lepiota aurea Massee, Lepiota pseudolicmophora Rea, and Leucocoprinus luteus (Bolton) Locq.
Leucocoprinus birnbaumii Etymology
Leucocoprinus is derived from the Greek Leucos meaning white and Coprinus, the name of a genus that until recently contained all of the mushrooms commonly referred to as inkcaps. (Following recent research based on molecular analysis, the majority of the inkcaps have been evicted from the genus Coprinus, which is now recognized as a member of the family Agaricaceae; most of the inkcaps are now included in the family Psathyrellaceae.) Certainly, apart from its stem ring the Plant Pot Dapperling looks very much like a yellow Parasola plicatilis, commonly referred to as the Pleated Inkcap.
The specific epithet birnbaumii honours a Czech gardener who found this mushroom growing in a hothouse in 1839.
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