E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
Features include a white sappy fruitbody with a coarsely hairy to bristly cap, a fragrant odor, flesh that is zoned or dries very dense, growth on hardwood in association with a white rot, and microscopic characters. The description is derived from Gilbertson(1) except where noted.

Tyromyces galactinus has been found in BC, WA, OR, NS, PQ, AL, AR, DE, IA, IN, KY, LA, MA, ME, MN, MO, MT, NC, NY, OH, PA, TN, VA, and WV, (Gilbertson).

Cap:
up to 8cm wide, 12cm long, and 1-3cm thick at base, bracket-like; semicircular, broadly attached or dimidiate, soft, watery and sappy when fresh, rigid when dry; "white to pale gray when fresh, becoming more yellow to pale ochraceous when dry"; at first strigose [coarsely hairy] to tomentose, "by age and drying more tufted to scrupose, especially towards the base, more consistently tomentose towards the margin", normally not zoned

Flesh:
"slightly duplex, lower part dense and zonate, often with a few resinous bands and drying cartilaginous, upper part looser and more fibrous"

Pores:
4-6 per mm, angular, thin-walled, entire to torn or toothed when old; white to cream, more yellowish to pale ochraceous when dry; tube layer up to 1cm thick, colored as pore surface

Odor:
slight fragrant odor when fresh

Microscopic:
spores 2.5-3 x 2-2.5 microns, elliptic to oval, colorless, inamyloid, thin-walled; basidia 4-spored 12-16 x 4-6 microns, clavate, with basal clamp; cystidia absent; hyphae monomitic, "generative hyphae with clamps, in the context thin-walled, 4-7 microns wide and branched, in the upper part partly in strands and more sparingly branched, in the trama more narrow, 2-5 microns wide"