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Gymnopilus luteofolius

[ Basidiomycota > Agaricales > Strophariaceae > Gymnopilus . . . ]

by Michael Kuo

This fantastic fungus showed up in my back yard this fall, fruiting from treated lumber (!) set down around a landscaping area. Its pale yellow gills contrast nicely with the purplish red cap and stem apex, and its partial veil becomes a flimsy ring or ring zone that catches the bright orange spores as they fall from the gills. My collection demonstrated bluish green staining on the cap and stem and, although green stains were not included in the original description of the species (Peck, 1875), subsequent collectors (e.g. Stamets, 1996) have documented the phenomenon. Other distinguishing features for Gymnopilus luteofolius include its bitter taste, the purplish pink sliced flesh, and microscopic features--including relatively small, finely warted spores and abundant cheilocystidia.

Description:

Ecology: Saprobic on the deadwood of conifers (including commercial lumber), and occasionally reported on the wood of hardwoods; usually growing in clusters; summer and fall, or over winter in warm climates; apparently widely distributed in North America. The illustrated and described collection is from Illinois.

Cap: 3-6 cm; convex, becoming planoconvex or flat; dry; densely to sparsely covered with small, innate scales, especially over the center; purplish red to pinkish brick red, fading to pinkish or yellowish (or somewhat mottled with these colors); often stained green in places; the margin not lined.

Gills: Attached to the stem by a notch; close; pale yellow at first, becoming deeper yellow and developing rusty brown discolorations; eventually becoming rusty overall; when very young covered by a thin partial veil.

Stem: 4-6 cm long; 4-6 mm thick; more or less equal; purplish pink near the apex, but brownish overall; fibrillose; with a flimsy, ephemeral ring or with a ring zone near the apex; basal mycelium white.

Flesh: Whitish; turning purplish pink in the cap when sliced.

Odor and Taste: Taste strongly bitter; odor not distinctive.

Chemical Reactions: KOH black on cap surface.

Spore Print: Bright orange-brown.

Microscopic Features: Spores 5.5-8 x 3.5-4.5 µ; more or less ellipsoid; finely warty; brownish orange in KOH; weakly dextrinoid. Pleurocystidia not found. Cheilocystidia abundant; lecythiform, fusoid-ventricose, capitate, or cylindric; thin-walled; 20-30 x 3-5 µ. pileipellis a poorly defined cutis; elements brownish in KOH, 2.5-5 µ wide, sometimes upright.

REFERENCES: (Peck, 1875) Singer, 1951. (Hesler, 1969; Arora, 1986; Stamets, 1996; Barron, 1999.) Herb. Kuo 10251403.


Further Online Information:

Gymnopilus luteofolius at MykoWeb

 

Gymnopilus luteofolius

Gymnopilus luteofolius

Gymnopilus luteofolius

Gymnopilus luteofolius

Gymnopilus luteofolius

Gymnopilus luteofolius

Gymnopilus luteofolius
KOH

Gymnopilus luteofolius
Spore print

Gymnopilus luteofolius
Spores

Gymnopilus luteofolius
Cheilocystidia



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Cite this page as:

Kuo, M. (2015, January). Gymnopilus luteofolius. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/gymnopilus_luteofolius.html