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Species Information
Summary: Features include a brown or gray brown, hairy cap and stem, bitter taste, sometimes an iodine odor, and annual growth usually on the ground under conifers. Jahnoporus hirtus is fairly common in the Pacific Northwest.
It is found in BC, WA, OR, ID, AZ, CA, CO, MI, NF, NY, and PQ, (Gilbertson).
Cap: 5-18cm, convex to flat or somewhat irregular; brown to dark brown or grayish brown; dry, with short, stiff, erect or matted hairs, (Arora), up to 15cm across, circular; upper surface grayish to pale purplish brown, not zoned; hispid [bristly] or scurfy to tomentose or becoming bald, rugose [wrinkled] or smooth; margin colored as surface, (Gilbertson), convex to somewhat irregular, fan-shaped, (Lincoff)
Flesh: thick, firm, rather tough; white, (Arora), up to 1cm thick, corky, whitish, not zoned, (Gilbertson)
Pores: 1-2 per mm, adnate to decurrent, white to creamy, drying yellowish, tube layer 0.2-0.6cm thick, (Arora), 1-2 per mm, angular, decurrent on stem, white to cream-colored, may be torn, tube layer up to 0.8cm thick, colored as flesh and continuous with it, (Gilbertson)
Stem: 2-10cm x 0.7-3cm, usually lateral or off-center, equal or narrowing downward, solid, firm, rather tough; colored as cap; hairy, (Arora), up to 10cm long and 4cm wide, central to lateral, simple or branched; tan to pale purplish brown, tomentose to bald, (Gilbertson), surface typically brown and velvety (Ginns(28))
Odor: according to Daniel Stuntz has iodine odor soon after picking (Arora), some with an odor of iodine evident soon after picking (Ginns(28)), pleasantly fragrant, nut-like, (Gilbertson)
Taste: very bitter (Arora)
Microscopic: spores 12-17 x 4.5-6 microns, spindle-shaped or cylindric, (Arora), spores 12.5-17 x 4.5-5.5 microns, fusiform, smooth, inamyloid, colorless; basidia 32-43 x 9-12 microns, 4-spored, clavate, with basal clamp, sterigmata swollen and up to 2.5 microns wide; cystidia lacking; context hyphae generative, 5-11 microns wide or with inflated parts up to 16 microns wide, colorless in KOH, moderately thick-walled, with occasional branching, with abundant clamp connections, trama hyphae 2.5-4 microns wide, thin-walled with clamp connections, (Gilbertson)
Spore Deposit: white (Arora)
Habitat / Range
annual, single or in groups on ground, "around old stumps and trees (especially conifers), sometimes also on wood (often buried)", (Arora), usually on ground under conifers, apparently from roots or other buried wood, (Gilbertson)
Similar Species
Bondarzewia occidentalis is more likely to grow in clusters, is not as bitter, and has warted amyloid spores, (Arora). Albatrellus species have different spores (Gilbertson). See also SIMILAR section of Scutiger pes-caprae and Bondarzewia mesenterica.
