Page author: Julie Jones
Inocybe rimosa
straw-colored fibre-head, split fibrecap, deadly Inocybe

Distribution: Broad

Conservation Status: Not of concern

Identification Notes:

Inocybe rimosa is a highly variable species that has gone by many different names, including I. fastigiata. Its size ranges from fairly small to, more commonly, medium to large (for an inocybe) and it is relatively robust. The cap is cone-shaped at first and then expands, usually retaining a prominent broad umbo; color is (rarely) whitish to (usually) yellowish brown or tawny with the center remaining darker and somewhat reddish and the edges being more yellowish; the surface is rather silky, strongly fibrillose, and prone to extensive radial splitting (it is “rimose,” hence the species epithet). The odor is usually spermatic. The gills are pale grayish when young and eventually become dull coffee brown. The stipe is whitish to pale yellowish, somewhat fibrillose, powdery at the apex, and has a slightly enlarged base, but not an abrupt bulb. The spores are smooth, elliptical or somewhat bean-shaped, 9--15 x 5--8.5 µm; the cheilocystidia are thin-walled and cylindrical to somewhat club-shaped; pleurocystidia are lacking. I. sororia is very similar, but has brighter yellow coloration and an odor of green corn.

Accepted Name:
Inocybe rimosa (Bull.: Fr.) P. Kumm.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Inocybe rimosa in the Consortium of Pacific Northwest Herbaria database.

CalPhotos: Inocybe rimosa photos.

4 photographs:
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