Barbatosphaeria lignicola
Barbatosphaeria lignicola Z.L. Luo, H.Y. Su & K.D. Hyde
Index Fungorum number: IF 555658, Facesoffungi number: FoF 05430
Etymology: Referring to this fungus dwelling on wood
Holotype: HKAS 84005
Saprobic on decaying wood submerged in freshwater habitats. Sexual morph: Ascomata immersed, globose to subglobose, dark brown to black, 380–400 μm high, 270–320 μm diam., aggregated in circular groups, occasionally solitary. Neck black, cylindrical, straight to slightly flexuous, converging radially. Peridium 25–40 μm thick, leathery to fragile, 2-layered. Outer layer consisting of thick-walled, brown, polyhedral to elongate cells of textura prismatica to textura angularis, towards the interior grading into several layers of thin-walled pale brown to subhyaline flattened cells. Paraphyses septate, slightly constricted at the septa, wider near the base, tapering toward the tip, longer than asci. Asci 19–31 × 4–6 μm (x̄ = 25 × 5 μm, n = 30), 8-spored, unitunicate, clavate in sporiferous part, tapering toward the stipe, ascal apex broadly rounded to obtuse. Ascospores 5–7 × 1–2 μm (x̄ = 6 × 1.5 μm, n = 20), arranged obliquely 1–2-seriately in the sporiferous part of the ascus, allantoid, U- to horseshoe shaped, narrow to pinted at both ends, aseptate, non-constricted, hyaline. Asexual morph Undetermined. (Luo et al. 2019)
Material examined: CHINA, Yunnan Province, Cangshan Mountain, saprobic on decaying wood submerged in Heilong stream, 15 March 2014, Z.L. Luo, S-105, (HKAS 84005, holotype).
Notes: Barbatosphaeria lignicola mostly resembles B. hippocrepida in having globose to subglobose, dark brown to black ascomata, black, cylindrical neck, septate paraphyses wider near the base, tapering toward the tip, longer than asci and slightly constricted at the septa, unitunicate, 8-spored asci and allantoid, U- to horseshoe shaped, hyaline, aseptate, non-constricted, similar size of ascospores (Réblová & Štěpánek 2009). However, B. lignicola differs from B. hippocrepida in having smaller ascomata (380–400 × 270–320 vs. 350–500 × 400–650 μm), ascospores tending to group in the apex of the sporiferous part while ascospores of B. hippocrepida tend to group in the middle of the sporiferous part, leaving the apex empty. Phylogenetic analyses show that Barbatosphaeria lignicola is distinct from other Barbatosphaeria species.
References
Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.
Réblová M, Štěpánek V (2009) New fungal genera, Tectonidula gen. nov. for Calosphaeria-like fungi with holoblastic-denticulate conidiogenesis and Natantiella gen. nov. for three species segregated from Ceratostomella. Mycol Res 113:991–1002.
Fig. 1. Barbatosphaeria lignicola (HKAS 84005, holotype) a Specimen. b, c Appearance of necks on substrate. d Horizontal section through ascomata. e, f Section through ascomata. g, h Structure of peridium. i Paraphyses. j–n Ascus. o–p Ascospore. Scale bars: e, f 150 μm, g–i 30 μm, j–p 5 μm.
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