Tengiomyces indicus (Varghese & V.G. Rao) Réblová, Mycotaxon 70: 408 (1999)
Basionym: Chaetosphaerella indica Varghese & V.G. Rao, Biovigyanam 5(1): 2 (1979)
MycoBank number: MB 450371; Index Fungorum number: IF 450371; Facesoffungi number: FoF 10002; Fig. 10
Saprobic on wood. Sexual morph: Ascomata 200–250 µm (x̄ = 230 µm, n = 5) diam., perithecial, superficial, solitary to gregarious, globose to subglobose, coriaceous, dark brown to black, surrounded by setae, seated on sparse, brown, septate, branched hyphae 3–8 µm wide, ostiolate, with papilla. Setae 3.5–11 µm wide, brown to dark brown, spine-like, straight, acute, aseptate, opaque, unbranched. Peridium 20–26 µm wide, comprising two layers, outer layer composed of brown cells of textura angularis; inner layer membranaceous, composed of hyaline cells of textura prismatica. Paraphyses septate, evanescent. Asci 60–70 × 10–15 µm, 8-spored, unitunicate, cylindrical to clavate, broadly rounded to truncate and thickened at the apex, with short pedicel. Ascospores 10–15 × 4–5.5 µm (x̄= 13 × 5 µm, n = 20), bi-seriate, ellipsoidal to clavate, with broadly rounded ends, straight to slightly curved, 3-septate, two middle cells pale brown to brown, two end cells hyaline to subhyaline, slightly constricted at the septa, smooth- walled. Asexual morph (associated): Hyphomycetous, spadicoides-like. Mycelium semi-immersed to superficial. Conidiophores 3.5–8 µm wide, arising from superficial hyphae growing from the base of the perithecial initials and mature ascomata, macronematous, mononematous, unbranched or branched in the lower parts, cylindrical, pale brown, straight, flexuous in the lower parts, septate, not constricted or slightly constricted at the septa, apical cells rounded. Conidiogenous cells 4–6 × 5–6 µm, polytretic, integrated, intercalary and terminal. Conidia 14–18 × 5.5–10 µm (x̄ = 15 × 7.5 µm, n = 20), obpyriform to clavate, broadly rounded at the apex, 2–3-septate, not constricted or slightly constricted at the septa, brown or the pigment fades from apex to bottom (adapted from Réblová 1999a).
Material examined: China, An-Hui, LangYa Shan, on dead wood of a deciduous tree, 20 June 1933, S.Q. Deng (BPI-622100); Guiana, Saint Laurent, Piste Balate, 12 km from Saint Laurent, 20 m elev, on dead branch, A. Rossman, C. Feuillet and L. Skog, 19 November 1986 (BPI-622098). Known hosts and distribution: On dead stems of a dicotyledoneous plant in India (type locality) (Varghese and Rao 1979); on dead wood of a deciduous tree in China (Réblová 1999a); on dead branch in Guiana.
Notes: Réblová (1999a) introduced Tengiomyces indicus after examining the holotype of Chaetosphaerella indica (AMH 3871), collected by Varghese in India (Varghese and Rao 1979) and a sample BPI 622100 collected by Deng in China. We re-examined two authentic specimens (622100 and 622098) which were determined by Réblová (mentioned in the label of material) and found that they were dry and observed only ascomata and evanescent asci and ascospores. We also found a spadicoides-like taxon by T. indicus on the natural substrate (Fig. 10h–i).
Fig. 10 Tengiomyces indicus: a–c (BPI-622098); d–f, h, i (BPI-622100); g, j (redrawn from Réblová 1999a). a Her- barium material. b–d Ascomata on host. e Squashed ascoma with dark brown setae. f Ascus. g Ascus with ascospores. h Conidiophore with conidium. i Conidium. j Conidiophores of spadicoides-like from nature. Scale bars: b, d = 500 µm, c = 200 µm, e = 100 µm, f–h, j = 20 µm, i = 10 µm