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Pluteus aurantiorugosus

[ Basidiomycota > Agaricales > Pluteaceae > Pluteus . . . ]

by Michael Kuo

What a gorgeous mushroom! Listed as rare in field guides, Pluteus aurantiorugosus is easily recognized by its habitat on wood, its pink spore print, and its scarlet to deep orange cap. I have found exactly one specimen in twenty years of mushroom hunting, so I will add my "yes" to the chorus of authors who say it is infrequently encountered.

Description:

Ecology: Saprobic on decaying hardwood logs and stumps; growing alone or in small groups; summer and fall; widely distributed in North America, but encountered more frequently east of the Rocky Mountains. The illustrated and described collections are from Illinois and Québec.

Cap: 2-5 cm; convex at first, becoming broadly convex to nearly flat, sometimes with a central bump; dry or moist; bald, or slightly granular; the margin not lined, or only faintly lined, at maturity; bright scarlet to orange when young, fading to orangish yellow in age.

Gills: Free from the stem; close or nearly crowded; short-gills frequent; whitish, becoming pinkish; often with yellowish edges.

Stem: 3-6 cm long; 0.5-1 cm thick; equal; finely hairy and fibrous; whitish to yellowish above, but flushed with the cap color below; basal mycelium white or yellowish.

Flesh: Pale yellowish; unchanging when sliced.

Odor and Taste: Not distinctive.

Spore Print: Pink.

Microscopic Features: Spores 5.5-8 x 4-5 µ; ellipsoid; smooth; hyaline and uniguttulate in KOH; inamyloid. Hymenial cystidia infrequent; widely lageniform; thin-walled; to 50 x 15 µ. Pileipellis a cystoderm with inflated terminal elements. Clamp connections absent.

REFERENCES: (Trog, 1857) Saccardo, 1896. (Kauffman, 1918; Homola, 1972; Smith, Smith & Weber, 1979; Lincoff, 1992; Barron, 1999; McNeil, 2006; Miller & Miller, 2006; Minnis & Sundberg, 2010; Justo et al., 2011; Kuo & Methven, 2014.) Herb. Kuo 09280301.


 

Pluteus aurantiorugosus

Pluteus aurantiorugosus

Pluteus aurantiorugosus

Pluteus aurantiorugosus

Pluteus aurantiorugosus

Pluteus aurantiorugosus

Pluteus aurantiorugosus
Spores



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Kuo, M. (2015, May). Pluteus aurantiorugosus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/pluteus_aurantiorugosus.html