Details about map content are available here Click on the map dots to view record details.
Species Information
Summary: Features include 1) large semicircular, flattened fruitbodies without a stem 2) growth mostly on true fir (also hemlock and in eastern North America oak), 3) an upper surface that is bumpy, pitted, and whitish (buff) to darker brown, 4) a thick, rounded margin colored as the upper surface or ivory-colored, 5) yellowish brown to reddish brown mottled flesh, 6) a whitish (buff) to darker brown pore surface with a sheen that varies with incident light, 7) exudation of amber water droplets from the upper surface and pore surface when fresh, and 8) microscopic characters, including nearly round, colorless spores and strongly ventricose, hooked setae.
Pseudoinonotus dryadeus has been found in BC, OR, AR, AZ, CA, GA, IL, IN, KY, LA, MD, MO, NC, NM, NY, OH, OK, PA, TN, TX, VA, and WV, (Gilbertson). It also occurs in Europe, Asia, (Breitenbach)
Cap: 7.5-40cm wide, "single or sometimes fused, convex to irregular, with thick rounded margin, exuding water drops when young; whitish to gray, becoming gray-yellow, red-brown, or blackish; flat-hairy, becoming smooth; uneven to warty or bumpy", (Lincoff), up to 23cm x 35cm x 15cm, without stem, single or imbricate [shingled], applanate (horizontally flattened), semicircular, annual; upper surface buff to dark brown, margin the same color or sometimes ivory; not zoned, very finely tomentose or bald, becoming cracked when old, (Gilbertson)
Flesh: 1.5-5cm thick, soft and spongy when fresh; yellow-brown to rust-brown, (Lincoff), up to 10cm thick, soft, fibrous, zoned, cut surface appearing mottled because of streaks of darker softer tissue; "bright yellowish-brown at first to reddish-brown in older specimens", (Gilbertson)
Pores: 3-5 per mm, "round to angular; whitish to gray-brown, often with silvery sheen, becoming dark"; tube layer 0.5-3cm thick, (Lincoff), 4-6 per mm, circular or angular, with thin entire walls; "buff, often with exuding droplets of amber liquid in fresh specimens, becoming dark brown and cracking with age"; tube layer up to 2cm thick, colored as flesh, (Gilbertson)
Stem: none or very short
Chemical Reactions: flesh black with KOH (Lincoff)
Odor: intensely unpleasant (Breitenbach)
Taste: mild, somewhat acidic, (Breitenbach)
Microscopic: spores 6-8 x 5-7 microns, nearly round, smooth, dextrinoid, cyanophilous, colorless, becoming thick-walled; basidia 4-spored, 14-16 x 9-11, broadly clavate to ovoid; setae usually frequent, rare in some specimens, 25-40 x 9-16 microns, ventricose, usually hooked; context hyphae 5-14 microns, "varying from pale brown in KOH and thin-walled to dark brown and thick-walled, with occasional branching, simple-septate", with a gummy incrustation in some areas, trama hyphae 5-9 microns wide, thin-walled to moderately thick-walled, uniformly pale brownish, simple-septate, with rare branching, (Gilbertson), spores 7-8.5 x 6.5-8 microns, round, smooth; setae present, (Lincoff)
Spore Deposit: yellow-white (Buczacki)
Habitat / Range
annual, primarily on Abies (fir) in the Pacific Coast region, in eastern North America primarily on Quercus (oak); typically developing at ground line at the base of trees or from roots at some distance from base, causes white rot of heartwood in butts and roots of living true firs and oaks, (Gilbertson), on live and dead Abies (true fir), Tsuga (hemlock), and Quercus (oak), causing a white rot, (Ginns)
Similar Species
Inocutis dryophilus also occurs on oaks but "has a hard, dark-brown mycelial core which is permeated with light veins, and in addition lacks setae", (Breitenbach). See also SIMILAR section of Inocutis dryophila and Onnia tomentosa.
