Marasmius nigripes var. albus Corner, Beih.

Honan, Amy H., Desjardin, Dennis E., Perry, Brian A., Horak, Egon & Baroni, Timothy J., 2015, Towards a better understanding of Tetrapyrgos (Basidiomycota, Agaricales): new species, type studies, and phylogenetic inferences, Phytotaxa 231 (2), pp. 101-132 : 129

Marasmius nigripes var. albus Corner, Beih. Nova Hedwigia 111: 75. 1996. Fig. 11e–g

Holotype:— SINGAPORE. Singapore Botanic Gardens , 15 June 1929, leg. EJH Corner (E #192522!).

The holotype collection consists of 3 basidiomes in fair condition, two attached to undetermined dicotyledonous leaves, one loose in packet, all 3 parasitized by a white mold. Description of dried holotype: Pileus pallid. Stipe slightly eccentric to central, non-insititious. Basidiospores (7–) 8–10.2 × 7.8–9 μm, tetrahedral, hyaline, inamyloid. Basidia 4-sterigmate. Basidioles clavate. Pleurocystidia absent. Lamellar edges sterile. Cheilocystidia 24–32 × 6.5–9 μm, irregularly cylindrical, sometimes lobate, apex often with a smooth capitulum or diverticulate, densely and coarsely diverticulate elsewhere, hyaline, thin-walled. Pileipellis a well-developed Rameales -structure of coarsely diverticulate hyphae 3–6 (–9) μm diam., non-gelatinized, non-incrusted, hyaline; diverticula knobby, obtuse, irregular in outline; terminal cells coarsely diverticulate or often with a smooth, bulbous capitulum, similar to the cheilocystidia. Pileus trama of weakly gelatinized, smooth hyphae 2.5–6 (–10) μm diam., hyaline, inamyloid. Stipe tissues not observed; material too scanty. Clamp connections present.

Status: This may be the oldest name for the pure white Tetrapyrgos with short, eccentric stipe and intervenose lamellae from SouthEast Asia and vicinity. Petch (1948: 27) reports a white form of M. subcinereus that represents this species but did not formally describe it as new. We accept Marasmius nigripes var. albus as a synonym of T. subcinerea .

Figures

FIGURE 11. Anatomical features for: Marasmius dichromopus (Spegazzini 2690—Holotype a–d). a. Basidiospores. b. Basidiole. c. Cheilocystidia apices. d. Pileipellis terminal cells. Marasmius nigripes var. albus (Corner E192522—Holotype e–g). e. Basidiospores. f. Cheilocystidia. g. Pileipellis terminal cells. Scale bar = 10 μm. Illustrated by D.E. Desjardin.