Collybiopsis bambusicola Q.Y. Zhang, J. Si & H.J. Li, 2023

Zhang, Qiu-Yue, Zhou, Meng, Shi, Feng-Ming, Si, Jing & Li, Hai-Jiao, 2023, Collybiopsis bambusicola sp. nov. in Yunnan Province, Southwestern China, Phytotaxa 578 (1), pp. 125-135 : 129-131

Collybiopsis bambusicola Q.Y. Zhang, J. Si & H.J. Li , sp. nov. ( Figures 2–3 )

MycoBank no.—845655

Etymology:— Bambusicola (Lat.) : refers to the species that inhabit dead bamboo.

Diagnosis:—This species notably has nearly poroid hymenophores radially arranged from the base of the stipe, oblong ellipsoid basidiospores, and gregarious on dead bamboo.

Habitat and distribution:—Gregarious on dead bamboo, at present only discovered from its type locality with three collections, mid-summer.

Type:— CHINA. Yunnan Province: Honghe, Jinping County, Fenshuiling Nature Reserve , E 103°28′, N 22°53′, 16 August 2019, Dai 20745 (Holotype, BJFC 032412 ) .

Description: —Basidiomata annual, gregarious, gelatinous when fresh, brittle when dry. Pilei conchoidal, reniform or round, 2–5 mm broad; pileal surface cream to cinnamon when fresh, becoming brownish gray upon drying, powdery, convex to plane, striate to sulcate; context concolorous with pileal surface, thin, 0.2–1 mm ( Figure 2 ). Hymenophore concolorous with pileal surface, lamellate; lamellae forked and transverse veined to nearly poroid, radially arranged as if a concentric ring centered on the base of the stipe, close with 1–2 series of lamellulae; lamellae surface powdery. Stipe eccentric, yellow near the pileus and to reddish brown near the base, terete, solid, 1–2 × 0.5–1 mm ( Figure 2 ). Odor and taste indistinct.

Basidiospores 6–8.3(–9.2) × 3–4.3 μm, L = 7.43 μm, W = 3.89 μm, Q = 1.87–1.95 (n = 60/2), oblong ellipsoid, hyaline, thin-walled, smooth, with one or two guttules, IKI–, CB– ( Figure 3a ). Basidia 25−32 ×6−8 µm, clavate, 2– spored, sterigmata 3–6 μm long; basidioles narrowly clavate to lanceolate. Pleurocystidia absent. Cheilocystidia 15–27 × 7–12 µm, clavate to pyriform to coralloid, with one or more broad finger-like projections at the apex ( Figure 3e ). Pileipellis hyphae interwoven, smooth to diverticulate, thin-walled, 2–6 µm in diameter; terminal cells free-form or “antler-shaped”, with broad finger-like projections ( Figure 3c ). Tramal hyphae subparallel, hyaline, some part swollen, thin-walled, 1.5–4 μm in diameter ( Figure 3e ). Hyphae in stipe parallel along stipe, sometimes swollen, slightly thickwalled, 4−6 µm in diameter ( Figure 3d ); Caulocystidia hyaline, thin-walled, smooth, clavate to irregular, 9–14 × 4.5–8 µm ( Figure 3b ); Clamp connections present in all tissues.

Additional specimens examined (paratypes): — CHINA. Yunnan Province: Honghe, Jinping County, Fenshuiling Nature Reserve , E 103°28′, N 22°53′, on dead bamboo, 16 August 2019, Dai 20739 ( BJFC 032406 ), Dai 20740 ( BJFC 032407 ) .

Figures

FIGURE 2. Basidiomata of Collybiopsis bambusicola.

FIGURE 3. Microscopic structures of Collybiopsis bambusicola (Dai 20745, holotype). a Basidiospores. b Caulocystidia. c Pileipellis. d Medullary hyphae of the stipe. e A section of lamellae trama, including cheilocystidia and hymenium. Illustration by Qiu-Yue Zhang.