''Bolbitius titubans'', also known as ''Bolbitius vitellinus'', is a widespread

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

mushroom A mushroom or toadstool is the fleshy, spore-bearing fruiting body of a fungus, typically produced above ground, on soil, or on its food source. ''Toadstool'' generally denotes one poisonous to humans. The standard for the name "mushroom" is t ...

found in

America The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

and

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a Continent#Subcontinents, subcontinent of Eurasia ...

. It grows chiefly on dung or heavily fertilized soil, and sometimes on grass. It is nonpoisonous.

Description

The

mushroom cap The pileus is the technical name for the cap, or cap-like part, of a basidiocarp or ascocarp (fungal fruiting body) that supports a spore-bearing surface, the hymenium.Moore-Landecker, E: "Fundamentals of the Fungi", page 560. Prentice Hall, 1972 ...

is between 1.5–7 cm, and grows from egg-shaped when young to broadly convex, finally ending up nearly flat. The cap's color starts yellow or bright yellow, and fades to whitish or greyish with age. The gills are free from the stem or narrowly attached to it, are fragile and soft, and fade from whitish or pale yellowish to rusty cinnamon with age. The stem is 3–12 cm tall and 2–6 mm wide, is whitish-yellow with a fine mealy powdering, and is very delicate. The

spores In biology, a spore is a unit of sexual or asexual reproduction that may be adapted for dispersal and for survival, often for extended periods of time, in unfavourable conditions. Spores form part of the life cycles of many plants, algae, f ...

are brown, elliptical, and smooth. The mushroom's edibility is unknown but it is too small to be worthwhile. A similar species is ''Bolbitius aleuriatus''.

References

Bolbitiaceae {{Agaricales-stub