Agaricus fuscofibrillosus
Key to Gilled Mushrooms KeyThis is a key to gilled mushrooms, that is, mushrooms having a definite cap with a fertile surface consisting of gills. The fruiting body usually also has a stem, although that may be lateral or absent (usually, then, the mushroom is growing from wood). You can use this key to identify mushrooms that you find.
Agaricales OrderFruiting body containing fibers (usually in the stalk)
Agaricus GenusGills free
Spore print chocolate brown
Annulus almost always present, usually membranous
The gills are usually pink or silvery-grey at first, but are colored chocolate brown at maturity from the developing spores
The cap and stalk are usually some sort of white or greyish brown, but may have fibrils or scales that are darker (like the portobello)
Growing on the ground, wood chips, or other organic debris
Sanguinolenti SectionFlesh stains red when bruised or in age. No color reaction with KOH
Fibrillose Sanguinolenti SubSectionCap fibrillose, sometimes clumping together in tufts, as in the photo
Usually flattened at the disk - - that is, the cap is completely flat in maturity, very bluntly conical when young
Here are the characters that distinguish this species from the others in its group. For its more general characters, see higher up on the page.
If there's just a few words or a microscopic feature here, a more thorough description can be found above.
Diagnosis
- Cap up to 2 3/4" across; light brown; completely covered with a dense, uniform layer of dark brown to reddish brown fibrils
-
Quickly reddening when cut
Microscropic Characters
Comments
The cap dimensions are according to A. E. Bessette, D. W. Fischer & A. R. Bessette (1997) . Arora (1986) gives the cap as up to 5 1/4" across, but he seems to be using a broader species concept.
