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Species Information
Summary: Features include 1) resupinate growth on pine, 2) a fruitbody that is cream to pinkish or brownish or brownish purple, lighter and fringed / radially fingered toward the margin, the surface with umbos at various points, 3) spores that are cylindric to almost kidney-shaped, 4) cystidia of 2 types: thick-walled encrusted and thin-walled, and 5) often individual brown-walled hyphae traversing a colored area. The description is derived from Weresub(2).
Peniophora pseudopini has been found in BC, OR, AB, MB, NT, ON, PQ, MA, ME, NH, NY, PA, and WI, (Ginns).
Fruiting body: round or confluent to somewhat spread out but not broadly so, "typically distinctly umbonate at one or several points, to irregularly tuberculate" to convoluted brain-like, often raised or reflexed when old, texture soft-ceraceous [waxy] to subindurated [somewhat hardened] or tough; "cream or rose-tan or flesh, to rosy brown to brown, to dusky or brownish purple, generally darkest in color centrally, particularly at umbos, usually abruptly lighter toward edge", rarely concolorous throughout; more or less pruinose; margin of actively growing fruiting body "typically white fimbriate, often with pronounced radial fingering", when old still fingered but lacking fimbriation or subvernicose [appearing somewhat varnish-like], or abruptly entire, raised or downcurved and incurved
Microscopic: SPORES (5.5)6-7.2(7.7) x (1.7)2.2(2.5) microns, cylindric, straight to almost kidney-shaped; BASIDIA about 4.5-5.5 microns broad at apex, flexuous-clavate; CYSTIDIA of 2 types: 1) "abundant to rare, projecting or not; when mature, wall of stalk thin, emphasized, or thickened, swollen sometimes to the point of capillarity of the lumen; where brown hyphae frequent, sometimes arising from these with brown stalks; full length as much as 60 microns though frequently shorter, particularly in the hymenium; apex sometimes capped only with a scatter of crystals but characteristically heavily encrusted, from 8 x 5.5 microns to as much as 40 x 15 microns", 2) gloeocystidia generally abundant, but varying from rare, "observed throughout the context and in the hymenium, but typically and most regularly in the upper subicular, transition, and lower subhymenial areas", variable in shape, "most typically strongly vesiculose to globoid", on narrowed stem, "with or without a hyphal rostrum", variable also in size of expanded part: up to 50 microns long (averaging 25 microns), up to 20 microns or more wide but generally 10-15 microns wide; IN SECTION, either colorless or browned "in zones (a) in the basal part of the subiculum or (b) from the transition area halfway or fully into the hymenium or in patches throughout the context, brownish due either to a deposit between hyphae or an impregnation of the walls or cytoplasmic content of the hyphae", context depth (less hymenium) typically 175-350 microns, subiculum "typically looking as if hyphae embedded in a matrix, composed of clearly parallel and mainly horizontal hyphae" (in radial section), transition area more or less gradual, HYPHAE 3.5-7 microns wide (occasionally up to 9.5 microns), "with walls only slightly thickened or swollen to as much as 3 microns in width", subhymenial hyphae "usually with walls considerably narrower than those of the subiculum" "where hyphal outlines may become indefinite through gelatinization, erosion, or cross-striation", most hyphae with colorless walls except in darker-colored patches, but individual brown-walled hyphae traversing a predominantly colorless area, with swollen, attenuate, or contorted or dichotomously branched tips in subhymenium or hymenium, when present, are strongly diagnostic of this taxon
Habitat / Range
on pine, rarely other conifers, usually attached dead branches or dead saplings, (Weresub), on bark of dead branches; fallen limbs; bark of dead saplings; associated with a white rot; associated with red heartwood stain in mature Pinus contorta [Lodgepole Pine]; on Abies (fir), Picea (spruce), Pinus (pine), Pseudotsuga (Douglas-fir), (Ginns)
Similar Species
Peniophora pini of eastern North America differs microscopically: brown-walled hyphae and tips are not seen traversing colorless areas; and vesiculose gloeocystidia (over 12 microns wide and 2:1 in ratio of width to length) may be rare to absent (subsp. duplex), or radial section with distinct subiculum as in pseudopini but of mainly interwoven rather than parallel hyphae, these separable, brittle, often exceeding 7 microns wide with walls typically greatly swollen, sometimes to as much as 4.5 microns in width (as opposed to hyphae that rarely exceed 7 microns, with walls only slightly thickened or to as much as 3 microns in width), (subsp. pini), (Weresub).
