Panaeolus affinis

Panaeolus affinis (E. Horak) Ew.Gerhardt


synonyms:
Copelandia affinis E. Horak

Macroscopic feat.:
  • Cap/Pileus: Up to 25 mm wide. Hemispherical when young, then convex or rounded-humped. Gray brown. Strongly hygrophanous, drying pale, often with olive tone against the grooved edge. Apex wrinkled. Flesh whitish to pale gray-brown, with blue-green staining (type-study).
  • Gills/Lamellae: Attached, gray to pale brown, with a distinct olive tone, pied, mottled, and with a white/sterile gill edge.
  • Stem/Stipe: Stipe approximately 85 x 3 mm, slender, cylindrical, whitish/pale gray brown, staining blue-green when injured, base white-tomentose, dry, pruinose at the top, fibrillose toward base, hollow, brittle/fragile.

Microscopic feat.:
  • Basidio/Spores: 9-11.5 (13) x 7-8.5 x 5-5.5, smooth, opaque, clearly prolate, flattened in face-view, always longer than wide, germ pore even/flush.
  • Basidia: Basidia mostly 4-spored, rarely 2-spored. Approximately 20-25 x 8-10 µm. Sulphidia absent.
  • Pleurocistidia: Metuloids with yellow brown cell walls. Similar to the cyanescens-type, approximately 40-60 x 13 - 20 around, frequently apically encrusted with crystals.
  • Cheilocystidia: Cheilocystidia ventricose to bottle-shaped, tip often capitate-subcapitate, hyaline, approx 20-35 µm long.

Habitat: On soil between leaf litter. Occasionally rotten wood.

Studied material: Holotype from New Guinea, Papua, Bulolo, (Agathis Res, Horak, 2.2.1972, p.p.maj. Copelandia affinis (ZT 72/121)). As yet, this species is known only from New Guinea (Asia). Only two collections were examined (the type and one other) as part of Gerhardt's Type Study.

Discussion: This species is distinguished from Panaeolus cyanescens mainly by the smaller spores. It should also be mentioned that the soil or decomposing wood substrates would make this Panaeolus very unique. Panaeolus lentisporus, is very similar, but its spores are even more flattened, also has even broader spores with an extremely prominent protruding germ pore.

Comment: The type material collected was abundant and in good condition. In Gerhardt's research he found that a few specimens differed significantly in its spore for. He separated these into a collection that he labeled as No. 72/121-a, distinguished from the remaining material. From No. 72/121-a, he described Panaeolus lentisporus. The majority of the collection was in agreement with the characteristics given in the original description. Horak's dimensions for the spores were 9-10 x 7.5-9 x 5-6.5 µm (which is shorter). This may be because Horak had not measured spores that were produced from 2-spored basidia. Also, two-sterigmate basidia were not mentioned in Horak's description.

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© psilosophy 2001-2022