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Species Information
Summary: Features include a light reddish brown to blackish, rough and/or concentrically grooved, tough-fleshed fruitbody that is shelf-like, bracket-like, or growing flat on wood with the pore surface exposed, pores that are circular to angular or maze-like and yellowish brown to reddish brown, tough flesh that is yellowish brown to reddish brown, growth on conifers, and microscopic characters including setae in the hymenium. It is a major cause of timber loss.
Porodaedalea pini is found in BC, WA, OR, ID, AB, MB, NWT, NB, NF, NS, ON, PE, PQ, SK, YT, AK, AL, AR, AZ, CA, CO, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MS, MT, NC, NH, NJ, NM, NV, NY, OH, PA, SC, SD, TN, TX, UT, VA, VT, WI, WV, and WY, (Gilbertson).
Cap: 2-20cm broad and 1-15cm thick, shelf-like, hoof-like, or bracket-like, may be fan-shaped; tough or woody; tawny to rusty brown becoming brown to reddish brown or brownish black when old, margin sometimes brighter; "surface hard, often crusty but not shiny", "rough or cracked, minutely hairy or roughened (like sandpaper) at first", often concentrically grooved when old, (Arora), bracket-like, bent outward from pore surface flat on wood to form shelf-like cap, or entirely flat on wood, caps up to 9cm x 13cm x 8cm, hoof-shaped or applanate [flattened]; upper surface light reddish brown to blackish; hirsute [hairy] toward margin, becoming bald and incrusted when old, zoned and grooved; margin reddish brown and hirsute, or sometimes yellowish brown and tomentose, rounded, (Gilbertson), margin acute (Allen)
Flesh: less than 1cm thick, tough; tawny to rusty reddish or ocher, (Arora), up to 3cm thick, corky; reddish brown or yellowish brown, "lustrous on cut surface", "usually with one or more thin black layers, in younger specimens often appearing duplex because of the hirsute upper layer", (Gilbertson)
Pores: "2-5 per mm, round to irregularly sinuous"; ochraceous tawny to rusty brown becoming brown; tube layer 0.2-0.5cm thick, (Arora), 2-3 per mm, circular to angular or daedaleoid [maze-like], yellowish brown, thick-walled; tube layers indistinctly stratified, each up to 0.6cm thick, light colored within a ground that is the same color as the flesh above it and continuous with the flesh, (Gilbertson)
Chemical Reactions: cap tissue blackening in KOH (Arora), all parts black in 3% KOH (Miller)
Odor: none (Miller)
Taste: unknown (Miller)
Microscopic: spores 4.5-7 x 3.5-5 microns, oval, smooth, inamyloid, colorless or becoming slightly yellowish in older hymenia; basidia 4-spored, 12-14 x 5-6 microns, broadly clavate, simple-septate at base; setae abundant, 40-50 x 10-14 microns, subulate [awl-shaped] to ventricose, thick-walled; hyphae of context of two types: 1) 3.5-7.5 microns wide, brown in KOH, thick-walled or thin-walled, rarely branched, simple-septate, 2) 2-3 microns wide, colorless, thin-walled, rarely branched, simple-septate, (Gilbertson), "spores 4-6 x 3.5-5 microns, round or nearly round, smooth", (Arora)
Spore Deposit: brown (Arora), pale brown (Miller)
Habitat / Range
perennial, single or more often in rows or columns up and down living or recently fallen conifers, mostly on older trees, (Arora), single or imbricate [shingled] on living conifers, a few reports on hardwoods, associated with a white pocket rot of the heartwood of living conifers, (Gilbertson), conks visible year round (Miller)
Similar Species
Porodaedalea 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, whereas P. 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, (Ginns(28)). See also SIMILAR section of Porodaedalea cancriformans and Phellinopsis overholtsii.
