Campanella candida var. stipitata 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 : 123

Campanella candida var. stipitata Singer, Mycologia 47: 765. 1955. Fig. 8h–j

Synonyms: Campanella stipitata (Singer) Singer, Beih. Nova Hedwigia 29: 86 1969.

Pterospora stipitata (Singer) E. Horak, Sydowia 36: 136. 1983.

Tetrapyrgos stipitata (Singer) E. Horak, Sydowia 39: 103. 1987 [1986].

Holotype:— ARGENTINA. Catamarca Prov.: Valle del Rio Campo, near Santa Rosa , elev. 1650 m, on fallen branches of dicotyledonous tree ( Schinus ?), 18 January 1952, R Singer T 1760 ( LIL!). The protologue incorrectly reports the date collected as 1954.

The holotype specimen consists of one intact basidiome, plus woody fragments of a dicotyledonous plant, probably Schinus sp. ( Anacardiaceae ). Description of dried holotype: Pileus plano-convex, venose, brown. Lamellae distant, strongly intervenose-anastomizing, narrow, brown. Stipe strongly eccentric to nearly lateral, about 2 × 0.5 mm, white-pruinose, subinsititious, arising from a very narrow ring of mycelium. Basidiospores few observed, 7.5–7.7 × 4.8–5.0 μm ellipsoid, without a lateral bulge (neither triangular nor tetrahedral), smooth, hyaline, inamyloid, thin-walled. Basidia not observed. Basidioles 22–29 × 5.5–7.5 μm clavate, clamped. Hymenial cystidia common, of two types: 1) metuloids, 32–55 × 9.5–12.5 μm, fusoid-ventricose, acute, hyaline, with walls up to 4.5 μm thick, often with apical resinous exudates (similar to metuloids in Campanella simulans as suggested by Singer 1955); 2) scattered leptocystidia 33–38 × 8–10 μm clavate, hyaline, thin-walled (not narrowly lageniform like C. tenuitunicata as suggested by Singer 1955). Pileipellis a thin Rameales -structure of densely diverticulate hyphae, hyaline, non-gelatinous, non-incrusted. Pileus trama of strongly gelatinized hyphae 2–5 μm diam., cylindrical, hyaline, inamyloid, thin-walled, smooth, clamped.

Status: We accept this as a species of Campanella , correctly named C. stipitata , similar to C. simulans but differing from the latter in forming smaller basidiospores, more sharply acute metuloids, and the presence of a stipe. The lack of triangular-bulging or tetrahedral basidiospores and lack of hymenial cystidia with central diverticula suggest that it does not belong in Tetrapyrgos .

Figures

FIGURE 8. Anatomical features for: Campanella aequatorialis (Singer B7128—Holotype a–c). a. Basidiospore. b. Two types of cheilocystidia. c. Pileipellis terminal cells. Singer (B1546) material of Campanella alba (d–e). d. Basidiospore. e. Cheilocystidia. Lagerheim (31 January 1892) material of Campanella alba (f–g). f. Basidiospores. g. Cheilocystidia. Campanella candida var. stipitata (Singer T1760—Holotype h–j). h. Basidiospores. i. Basidioles. j. Two types of hymenial cystidia. Scale bar = 10 μm. Illustrated by D.E. Desjardin.