|gills on hymenium|
|cap is conical or flat|
|hymenium is adnexed|
|stipe has a ring|
|spore print is brown to reddish-brown|
|ecology is saprotrophic|
Pholiotina rugosa is a common lawn mushroom which is widely distributed and especially common in the Pacific Northwest. It also grows on woodchips, rich soil and compost. It has been found in Europe, Asia and North America. It contains the same mycotoxins as the death cap. It is more commonly known as Conocybe filaris as this is the name it is likely to appear under in field guides. However, Conocybe filaris is a junior synonym of Pholiotina rugosa. Pholiotina rugosa has also been placed in the genus Conocybe, but its morphology and a 2013 molecular phylogenetics study place it in the genus Pholiotina. Pholiotina fimicola, which grows on dung and rich soil in North America is a possible synonym. Pholiotina arrhenii has also been considered a possible synonym, but a molecular phylogenetics study found it to be a distinct species.
Pholiotina rugosa has a cap which is conical, expanding to flat, usually with an umbo. It is less than 3 cm across, has a smooth brown top, and the margin is often striate. The gills are rusty brown, close, and adnexed. The stalk is 2 mm thick and 1 to 6 cm long, smooth, and brown, with a prominent and movable ring. The spore print is rusty brown.
This species is deadly poisonous. They have been shown to contain amatoxins, the same toxins found in the death cap, which are highly toxic to the liver and are responsible for many deaths by poisoning from mushrooms in the genera Amanita and Lepiota. They are sometimes mistaken for Psilocybe, especially Psilocybe cyanescens and Psilocybe subaeruginosa species due to their similar looking pileus (cap).
- "Pholiotina filaris (Fr.) Singer (1936)". MycoBank. International Mycological Association. Retrieved 2015-10-18.
- "Pholiotina rugosa (Peck) Singer (1946)". MycoBank. International Mycological Association. Retrieved 2015-10-18.
- "Conocybe pusilla (Quél.) Romagn. (1937)". MycoBank. International Mycological Association. Retrieved 2015-10-18.
- Hausknecht A, Krisai-Greilhuber I, Voglmayr H (2004). "Type studies in North American species of Bolbitiaceae belonging to the genera Conocybe and Pholiotina". Österreichische Zeitschrift für Pilzkunde. 13: 153–235.
- Hausknecht, Anton; Kalamees, Kuulo; Knudsen, Henning; Mukhin, Viktor (2009). "The genera Conocybe and Pholiotina (Agaricomycotina, Bolbitiaceae) in temperate Asia" (PDF). Folia Cryptogamica Estonica. 1345: 23–47.
- Tóth, Annamária; Hausknecht, Anton; Krisai-Greilhuber, Irmgard; Papp, Tamás; Vágvölgyi, Csaba Vágvölgyi; Nagy, László G. (2013). "Iteratively Refined Guide Trees Help Improving Alignment and Phylogenetic Inference in the Mushroom Family Bolbitiaceae". PLOS ONE. 8 (2). doi:10.1371/0056143.
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