 Description： |
Basidiocarp at first forming orbicular patches, then widely effuse, adnate, membranaceous, 120-300 μm thick in section (aculei excluded). Hymenial surface Pale Ochraceous-Salmon or Cartridge Buff, hydnoid, cracked; margin paler, thinning, arachnoid. Aculei separate or fused, 3-6 per mm, subulate, 200-600 × 70-150 μm. Hyphal system monomitic; generative hyphae nodose-septate. Subiculum indistinctly bi-layered. Basal layer with compact texture, variably thick, up to ca. 40 μm; generative hyphae horizontal, colorless, ± agglutinated. Medullary layer constituting main part of subiculum, with rather loose texture; generative hyphae irregularly interwoven, colorless, distinct or not, slightly tortuous, 1.5-3 μm diam., thin-walled; quasi-binding hyphae numerous, colorless, 1-2 μm diam., thin- or slightly thick-walled. Hymenial layer with rather compact texture, thin. Crystals scattered through-out section. Trama with compact texture, full of yellowish brown excreted material. Cystidia variably abundant, immersed or slightly projecting, cylindrical or tubular, usually swollen near apices, slightly flexuous, with homogeneous contents, 40-10 × 6-11 μm, thin-walled. Basidia subcylindrical or subclavate, 14-18 × 4.5-5.3 μm, 4-sterigmate. Basidiospores broadly ellipsoid or subglobose, with a minute apiculus, smooth. thin-walled, with homo-geneous contents, 5-5.7 × 3.3-4 μm, IKI-, CB-. |
| Specimens： |
Taiwan. Nantou: Sun-Moon Lake, alt. 800 m, on branch of Castanopsis kusanoi, 26 Oct 1988, Wu 881026-18 (H, TNM). |
| Note： |
Jülich (1978) transferred this species to the genus Radulodon Ryvarden, but the basidiospores of that genus are globose or subglobose and have thicker walls. Pseudolagarobasidium calcareum resembles P. subvinosum in forming orbicular patches in its early basidiocarp development, in having a hydnoid hymenial surface, in the shape of its cystidia, basidia and basidiospores and in the homogeneous spore contents. The quasi-binding hyphae in P. calcareum may have evolved fairly recently and may therefore be of minor taxonomic importance. I could not find basidiospores in the holotype of P. calcareum; the measurements given for the spores in the protologue are 3 × 1.5 μm, and may be of exotic origin. Another Australian specimen, reported by Jülich (1978), has a looser consistency than the type and my Taiwanese collections, and its quasi-binding hyphae are not so clear as those of the other two specimens. |
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Phylum：Basidiomycota >> Class： Basidiomycetes >> Order： Polyporales