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Description type:Original description 
Description:Stalpersia orientalis Parmasto, sp. nova Fig. 1
Basidiome irregularly pileate, semiorbicular, irregularly flabelliform or orbicular, shortly stipitate or dimidiate, 2-5 cm in diam, white or cream coloured, when dried slightly yellowish, watery soft, fleshymembranaceous or subcartilagineous when fresh, light in weight, when dried almost horny. Stipe (when present) up to 2 cm long and 5-10 mm in diam, with 1-3 pilei. Pileal surface uneven, glabrous or slightly floccose, without pileipellis (cuticle); margin slightly dentate or lobed; hymenium radially lowfolded or plicate, merulioid (sometimes like in Plicaturopsis nivea), white or creamish (Munsell: 5 Y 9/3). With a light smell of flour or without odour.
Hyphal system monomitic; generative hyphae densely radially arranged, thin-walled, with clamps, sparsely branched, 3.5-6 µm diam; gloeoplerous hyphae present, slightly flexuose, thin-walled, with yellowish granulose content, 4-6 µm in diam, some forming tramal gloeocystidia 40-90 x 8-12 µm; subhymenial hyphae densely interwoven, with very thin walls. Gloeocystidia embedded, broadly clavate, obtuse, 30-50 x 8-12 µm; basidia subutriform, 35-40 x 6-8(-10) µm, soon collapsing, with 4 sterigmata 4-6 µm long; spores broadly ellipsoid or almost tear-shaped, 5.5-6.8 x 4.0-4.8(-5) µm, with a large hilum 1-1.5 µm; long, sometimes with a big guttula, slightly thick walled, densely echinulate (spinulose), spines conical, 0.5-1 µm long, amyloid.
Holotype. Russia, Primorsk Tern, Distr. Ternei, Sikhote-Alin Nature Reserve, Maisa (45'15.5' N, 136°28' E), on forest litter in an Abies forest, 15 Sep 1990 E. Parmasto (TAA 151103). Paratype. Sikhote-Alin Nature Reserve, Ust-Serebryanka (45'07.5'N, 136°22.5' E), on rotten wood in a floodplain deciduous forest, 14 Sep 1987 I. Parmasto (TAA 126153). Etymology: orientalis, eastern.
Remarks. The species is possibly a mycorrhiza fungus able to develop in forest litter.
Mean spore size (µm) and Q value in the type specimens:
6.29 x 4.49 1.40 (TAA 151103)
6.00 x 4.14 1.36 (TAA 126153, spore print)
 
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