|Major Groups > Gilled Mushrooms > Dark-Spored > Psathyrella > Psathyrella spadiceogrisea|
by Michael Kuo
Psathyrella spadiceogrisea is a large, springtime Psathyrella, appearing in both hardwood and conifer forests. Aside from its larger size, it is virtually indistinguishable from Psathyrella pseudovernalis in macroscopic features; both species feature brown caps, wisps of veil material along the cap margin, dark brown spore prints, and snap-able white stems. Under the microscope, however, Psathyrella spadiceogrisea features utriform (rather than fusoid-ventricose) hymenial cystidia--and its gill edges bear inconspicuous (rather than conspicuous) sphaeropedunculate elements.
Ecology: Saprobic; growing scattered to gregariously or in small clusters in hardwood or conifer forests, often near woody debris; spring and early summer; apparently widely distributed in North America.
Cap: 2-8 cm; convex, broadly conical, broadly bell-shaped, or nearly flat at maturity; bald; the margin finely lined; medium brown to yellow-brown, fading markedly as it dries out to brownish buff; when young with wisps of veil tissue, especially along the margin.
Gills: Attached to the stem; close or nearly distant; pale brownish to whitish at first, becoming dark brown.
Stem: 4-12 cm long; up to 1 cm thick; equal; fragile; whitish; bald or finely silky; sometimes grooved near the apex; without a ring.
Flesh: Thin; fragile; brownish.
Odor and Taste: Not distinctive.
Chemical Reactions: KOH on cap surface negative.
Spore Print: Very dark brown with a hint of purple.
Microscopic Features: Spores 6-10 x 3-5.5 µ; ellipsoid; with a pore; smooth; dark brown in KOH. Pleurocystidia utriform; thin-walled; to about 50 x 15 µ. Cheilocystidia utriform; scattered; thin-walled. Sphaeropedunculate elements on gill edge inconspicuous; subglobose, without apical necks. Pileipellis hymeniform/cellular.
Kits van Waveren (1985) reduced a number of species to mere "forms" of Psathyrella spadiceogrisea, including Psathyrella vernalis. Like several authors (e.g. Orton, 1986 and Hansen & Knudsen, 1992) I disagree with this approach.
Cite this page as:
Kuo, M. (2011, January). Psathyrella spadiceogrisea. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/psathyrella_spadiceogrisea.html