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Species Information
Summary: Features include a salmon-pink pore surface growing flat on wood, mild taste, and microscopic characters. The online Species Fungorum, accessed April 20, 2020, gave the current name as Rhodonia placenta but Mycobank, accessed the same day gave the current name as Postia placenta. The name in Rhodonia is used here because of the support provided in Shen, L.L.(1) where Rhodonia is separated in the phylogeny from most of Postia. The description is derived from Gilbertson(1) except where noted.
Postia placenta has been found in BC, WA, ID, AB, ON, AZ, CO, MD, MI, MT, NM, NV, and NY, (Gilbertson).
Cap: up to 30cm across, growing flat on wood with pore surface exposed, tough when fresh, rigid when dry, not readily separable; margin up to 0.1cm wide, narrowly sterile, pale pinkish, fimbriate [fringed]
Flesh: less than 0.1cm thick, tough when dry; whitish or very pale salmon-pink, not zoned
Pores: 3-4 per mm, circular to angular, "sometimes splitting apart to form large circular depressions", with thick walls that become thin and torn; salmon-pink, often cream to pale buff on drying; tube layer up to 0.3cm thick, "cutting cheesy", continuous with the flesh, salmon-pink
Odor: strong, astringent, (Buczacki)
Microscopic: spores 5.5-7 x 2-2.5 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 17-25 x 5-6 microns, clavate, with basal clamp; cystidia absent; hyphae monomitic, hyphae of subiculum 2-4.5 microns wide, colorless in KOH, thick-walled to thin-walled, often branched, with clamp connections, hyphae of trama similar, gloeoplerous hyphae present
Spore Deposit: white (Buczacki)
Habitat / Range
annual, on dead wood of conifers, associated with brown cubical rot of dead conifer wood, (Gilbertson), on conifers, rarely on Populus, (Ginns), late summer to fall (Buczacki)
Similar Species
See also SIMILAR section of Ceriporiopsis pseudoplacenta.
