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Agrocybe paludosa

[ Basidiomycetes > Agaricales > Bolbitiaceae > Agrocybe . . . ]

by Michael Kuo

As it is currently defined, Agrocybe paludosa represents a way of looking at mushrooms, rather than a fungal species in the natural world. Theoretically, it is an Agrocybe with a dainty ring and a very skinny stem, typically found in wet places (bogs, marshes, flooded meadows, and so on)--but research by Flynn and Miller (1990) was not able to uphold Agrocybe paludosa as a biological species (see the Agrocybe praecox cluster for more information), and the authors suggest that observing differences in physical features may not be particularly useful for separating the natural species in this group.

I assigned the illustrated collection (sorry about the poor quality of the photo) to Agrocybe paludosa several years ago, before reading Flynn and Miller--and I am retaining the label (as well as this Web page) in order to demonstrate the kind of mushroom that corresponds to the description of physical features used in field guides and keys to delineate the "species"--despite the fact that "Agrocybe praecox cluster" is probably a more scientifically accurate label.


Ecology: Saprobic; growing alone or gregariously in wet woodland areas (bogs, marshes, flood plains, and so on); summer and fall; widely distributed in northern North America.

Cap: 1.5-3 cm; convex, becoming broadly convex or flat; smooth; thinly slimy when fresh; olive gray when young, but soon fading to dirty buff; the margin sometimes slightly lined.

Gills: Attached to the stem; close; pale grayish becoming purplish brown, then cinnamon brown in maturity.

Stem: 5-8 cm long; 2-3 mm thick; more or less equal; fairly smooth; with a thin, tissue-like ring; pale, or becoming dull brown near the base.

Flesh: Pale and thin.

Taste: Not distinctive; odor not distinctive.

Spore Print: Dull brown to cinnamon brown.

Microscopic Features: Spores 9-11 x 4.5-6.5 µ; elliptical; smooth; truncated. Pleurocystidia more or less fusoid-ventricose; 35-50 x 15-20 µ. Cheilocystidia similar but smaller.

REFERENCES: (Lange) Kühner & Romagnesi, 1987. (Smith, Smith & Weber, 1979; Moser, 1983; Hansen & Knudsen, 1992.) Herb. Kuo 08300402.

This site contains no information about the edibility or toxicity of mushrooms.


Agrocybe paludosa

Agrocybe paludosa

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Kuo, M. (2006, September). Agrocybe paludosa. Retrieved from the MushroomExpert.Com Web site: