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Species Information
Summary: Features include shelf-like to flat growth on wood, a dull reddish brown upper surface that is grooved, zoned, and tomentose or with stiff erect hairs, the upper tomentum separated by a thin dark layer from the lower flesh, the pore surface bright yellowish brown before darkening, and microscopic characters including hymenial setae.
Porodaedalea chrysoloma has been found in BC, WA, OR, ID, AB, MB, NB, NF, NS, NWT, ON, PQ, SK, YT, AK, AZ, CA, CO, MA, ME, MI, MN, MT, NH, NV, NM, NY, PA, UT, VT, WI, and WY, (Gilbertson).
Cap: bent outwards to form cap from pore surface growing flat on wood, or shelf-like, up to 5cm wide, often entirely flat during early stages, shingled in clusters on standing trees, often in rows on fallen trees, caps thin and applanate (flattened), dimidiate [roughly semicircular] to elongate; upper surface dull reddish brown to bright yellowish brown at the margin; tomentose to hispid [with stiff erect hairs], grooved, zoned; margin usually wavy, slightly lobed, sharp, narrowly sterile underneath, (Gilbertson), 1-8cm, thin, flat, crust-like, with sharp margin; "orangy brown to russet brown with a paler margin, becoming dark brown to blackish"; with concentric rings and hairy ridges, (Phillips)
Flesh: tough-fibrous; reddish brown, with a thin black line separating the soft upper tomentum from the lower context, dense lower layer up to 0.3cm thick, tomentum up to 0.1cm thick, (Gilbertson), 0.1-0.3cm thick, "tawny or dingy yellow, separated from cap hair by black line", (Phillips)
Pores: 1-3 per mm in most, 4-6 per mm in others, angular to slightly daedaleoid [maze-like]; bright yellowish brown at first, darkening; glancing [showing a change in appearance from dull to lustrous when the orientation to light is changed]; walls thin, entire to torn, entire tube layer up to 1cm thick, indistinctly stratified, inner surface ochraceous, paler than trama and flesh, (Gilbertson), 2-5 per mm, angular to elongate; bright ocher-tawny; tube layer up to 0.5cm, accumulating layers annually, (Phillips)
Microscopic: spores 4-5.5 x 4-5 microns, oval to nearly round, smooth, inamyloid, colorless, becoming pale yellowish brown, becoming slightly thick-walled; basidia 4-spored, 10-12 x 5-6 microns, clavate, simple-septate at base; setae abundant, 25-60 x 7-10 microns, subulate, thick-walled, bright reddish brown in KOH; hyphal system dimitic: hyphae of fibrous context 2-4 microns wide, "thin-walled and almost hyaline to thick-walled and bright reddish brown in Melzer''s reagent, darker brown in KOH, septate, occasionally to often branched, closely interwoven into a compact tissue", hyphae of upper tomentum 2-5 microns wide, "thin-walled and yellowish to thick-walled and bright reddish brown, septate, with rare branching", "dark layer between lower context and tomentum composed of dark, closely interwoven hyphae"; trama hyphae 2-3 microns wide, colorless to yellowish brown, thin-walled to slightly thick-walled, septate, with rare to occasional branching, (Gilbertson), spores 4.5-5.5 x 4-5 microns, nearly round, smooth, (Phillips)
Spore Deposit: light brown (Phillips)
Habitat / Range
perennial or sometimes annual, on living and dead conifers in all genera of Pinaceae, causing a white pocket rot, "pathogenic in true firs, killing sapwood, and causing stem cankers in which the basidiocarps develop", (Gilbertson), sometimes perennial, "in dense overlapping clusters or partly fused rows on decaying or living conifer trunks", (Phillips)
Similar Species
Porodaedalea pini has context up to 3cm thick, margin is typically blunt, pores are typically 2-3 per mm, setae are mostly 10-14 microns in diameter, and skeletal hyphae are 3.5-7.5 microns in diameter, whereas P. chrysoloma has context up to 0.4cm thick, margin is typically acute, pores are typically 4-6 per mm but some 1-3 per mm, setae are mostly 7-10 microns in diameter, and skeletal hyphae are 2-4 microns in diameter, (Ginns(28)). See also SIMILAR section of Fuscoporia viticola.
