Campanella tenuitunicata Singer, Mycologia

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 : 126-127

Campanella tenuitunicata Singer, Mycologia 47: 764. 1955. Fig. 10a–c

Synonym: Pterospora tenuitunicata (Singer) E. Horak, Sydowia 36: 138. 1983.

Holotype:— ARGENTINA. Catamara Prov.: Valle del Rio Campo, cerca de Santa Rosa, elev. 1650 m, on wood of Schinus sp. ( Anacardiaceae ), 18 January 1952, R Singer T 1750 ( LIL!).The holotype specimen consists of 7 whole or fragmented basidiomes loose in the box, in poor condition, plus fragments of woody substrate. Description of dried holotype: Basidiomes sessile, attached laterally or by a small pseudostipe within 1 mm of the pileus margin. Pileus plano-convex, pale brown. Lamellae distant to remote, strongly anastomosed and intervenose, narrow. Basidiospores 8–11.5 × 5–7.4 μm, broadly ellipsoid, a few with a lateral bulge, not tetrahedral, smooth, hyaline, inamyloid, thin-walled. Basidia 4-sterigmate. Basidioles clavate. Lamellae reviving poorly and most elements collapsed; hymenial cystidia few observed, narrowly tibiiform, smooth, lacking diverticula, hyaline, thin-walled.Pileipellis a well-developed Rameales -structure of densely diverticulate hyphae, only a few hyphal layers thick, non-gelatinized; hyphae 2.5–5 μm diam., hyaline; diverticula crowded, 0.5–2 × 0.5–1.2 μm, irregularly cylindrical, sometimes lobed, hyaline. Pileus trama heavily gelatinized; hyphae 2–5 μm diam., loosely interwoven, cylindrical, branched, non-incrusted, hyaline, thin-walled. Clamp connections present.

Status: Based on the highly gelatinized pileus trama, cheilocystidia lacking diverticula, a reduced lateral stipe or pseudostipe, and the rarely bulging, ellipsoid spores, this represents a species of Campanella , not Tetrapyrgos . Horak (1983) made the initial transfer to Pterospora , but he never subsequently transferred the species to Tetrapyrgos (cf. Horak 1987). Horak suggested that C. tenuitunicata was closely related to C. austrochilensis , C. alba , C. peullensis , and T. subdendrophora . Without analyses of new material of C. austrochilensis and C. peullensis (see above), the relationships amongst these species remain ambiguous.

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.