Dictyocheirospora heptaspora (Garov) D’souza, Boonmee & K.D. Hyde , in Boonmee et al., Fungal Diversity 80: 14 (2016). Fig. 73
≡ Cattanea heptaspora Garov., Rc. Ist. Lomb., Milano, ser. 2 8: 125 (1875).
MycoBank number: MB 551589; Index Fungorum number: IF 551589; Facesoffungi number: FoF 01256.
Saprobic on decaying wood submerged in freshwater habitats. Sexual morph: Undetermined. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Conidiomata on natural substratum sporodochia, superficial, compact, scattered, circular or subglobose, dark brown to black, velvety. Mycelium immersed, consisted of septate, branched, hyaline, smooth. Conidiophores micronematous, reduced, pale brown, smooth. Conidiogenous cells monoblastic, integrated, terminal, determinate, hyaline to pale brown. Conidia 72–86 µm (x̅ = 79 µm, SD = 7, n = 20) long, 20–26 μm (x̅ = 23 µm, SD = 3, n = 20) wide, acrogenous, solitary, cheiroid, smooth- walled, complanate, yellowish-brown to brown, consisting of 5–7 rows of cells, rows digitate, cylindrical, each rows composed of 10–12 cells, septate, constricted at septa.
Material examined – China, Yunnan Province, Lancang river, saprobic on decaying wood submerged freshwater, May 2017, Z.L. Luo, S-1992 (DLU 1992), living culture DLUCC 1992.
GenBank numbers – ITS: MT756244, LSU: MT756243, tef1: MT776563.
Notes – Phylogenetic analyses showed that our new isolate S-1992 clustered with Dictyocheirospora heptaspora (Fig. 75). Morphologically our species fits well with the morphological characters of D. heptaspora (Tsui et al. 2006). Therefore, we identified our new isolate as D. heptaspora.
Figure 73 – Dictyocheirospora heptaspora (DLU 1992) a Colonies on wood. b–g Conidia. h Germinating conidium. i, j Colonies on PDA from surface and reverse. Scale bars: b–h = 35 µm.
Figure 75 – Phylogram generated from maximum likelihood analysis (RAxML) of Dictyocheirospora species based on ITS, LSU and tef1 sequence data. Maximum likelihood bootstrap values equal or above 70 %, Bayesian posterior probabilities equal or above 0.90 (MLBS/PP) are given at the nodes. An original isolate number is noted after the species name. The tree is rooted to Periconia igniaria (CBS 379.86 and CBS 845.96). The ex-type strains are indicated in bold. Hyphen (-) represents support values below 70 % MLBS and 0.90 PP.