Gymnopus floridanus Murrill, Bull. Torrey Bot.

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 : 127-128

Gymnopus floridanus Murrill, Bull. Torrey Bot. Club 66: 158. 1939. Fig. 10d–g

Accepted as a synonym of Tetrapyrgos nigripes by Singer (1973) and Horak (1983).

Holotype:— UNITED STATES. Florida: Kelley’s Hammock, 10 miles northwest of Gainesville, on log of sweet gum ( Liquidambar styraciflua , Altingiaceae ), 3 August 1938, leg. West & Murrill ( FLAS F-18290!).

The holotype specimen consists of numerous basidiomes in fair condition. Description of dried holotype: Pileus convex with a central papilla, translucent-striate. Lamellae adnate to subdecurrent, distant, very narrow. Stipe silky, broad, non-insititious, with a distinct ring of basal white mycelium. Lignicolous. Basidiospores not observed; material immature; protologue indicates spores not found. Basidia not observed. Basidioles cylindrical to clavate. Pleurocystidia absent. Cheilocystidia scattered, 22–32 × 3–5 μm, narrowly clavate to cylindrical with an inflated apex, smooth, hyaline, inamyloid, thin-walled. Pileipellis a cutis of radially arranged, non-diverticulate hyphae, 2.5–8 μm diam.; terminal cells suberect to erect, cylindrical to clavate, smooth, sometimes geniculate, abundant over pileus disc and scattered elsewhere; all cells hyaline, inamyloid, subgelatinous, with walls up to 0.5 μm thick. Tramal hyphae interwoven, subgelatinous, similar to pileipellis hyphae with interspersed highly refractive, cylindrical to contorted oleiferous hyphae. Stipe tissue monomitic; cortical and medullary hyphae similar, subparallel, 2.5–6.5 μm diam., cylindrical, smooth, hyaline, inamyloid, thin-walled; with scattered oleiferous hyphae. Stipitipellis of numerous, clustered caulocystidia, irregularly clavate, smooth (lacking diverticula), hyaline, thin-walled. Clamp connections present.

Status: This taxon is of uncertain taxonomic position, but is certainly not a species of Tetrapyrgos . The material is immature, lacks basidiospores, and has non-diverticulate cheilocystidia, pileipellis and stipitipellis hyphae, excluding Tetrapyrgos from consideration.

Figures

FIGURE 10. Anatomical features for: Campanella tenuitunicata (Singer T1750—Holotype a–c). a. Basidiospores. b. Basidium. c. Hymenial cystidia. Gymnopus floridanus (F-18290—Holotype d–g). d. Basidioles. e. Cheilocystidia. f. Pileipellis terminal cells. g. Caulocystidia. Marasmius caesius (F-18263—Holotype h–k). h. Basidiospores. i. Basidium and basidiole. j. Cheilocystidia. k. Pileipellis terminal cells. Scale bar = 10 μm. Illustrated by D.E. Desjardin.