Chloridium aseptatum M.J. Wei & H. Zhang, 2018

Wei, Ming-Jie, Zhang, Huang, Dong, Wei, Boonmee, Saranyaphat & Zhang, Di, 2018, Introducing Dictyochaeta aquatica sp. nov. and two new species of Chloridium (Chaetosphaeriaceae, Sordariomycetes) from aquatic habitats, Phytotaxa 362 (2), pp. 187-199 : 191-192

Chloridium aseptatum M.J. Wei & H. Zhang , sp. nov. ( Fig. 2 )

Type: — THAILAND. Chiang Rai: Khun Korn, on submerged wood, 26 February 2011, H. Zhang, e38 (holotype: MFLU 11-1051), ex-type culture MFLUCC 11-0216.

Index Fungorum number: —IF 554800; Facesoffungi number: —FoF 04770

Etymology: —In reference to the aseptate conidia.

Colonies on natural substrate, effuse, thin hairy, greenish-grey or brown. Mycelium partly superficial, partly immersed, consisting of branched, septate, smooth, thin-walled, subhyaline to pale hyphae. Stroma none. Setae and hyphopodia absent. Conidiophores 30–100 × 7–10 μm wide, macronematous, mononematous, scattered, solitary, cylindrical, robust at the base, erect, straight or slightly flexuous, unbranched, brown, fading towards the apex, septate, smooth, percurrently proliferating. Conidiogenous cells monophialidic, integrated, terminal, cylindrical, with a conspicuous collarette, subhyaline to pale brown. Conidia 9–12 × 6–9 μm, acrogenous, solitary or formed in slimy masses, obovoid to broadly obovoid, hyaline, unicellular, smooth, thin-walled, containing one guttula. Sexual morph: Undetermined.

Known distribution:— Thailand.

Culture characteristics: — On PDA, colony circular, reaching 11 mm in 5 days at 25°C, cream yellow and smooth in the center, white and slightly hairy on the outer edge, dry, edge entire.

Notes: — Based on the combined gene analysis, Chloridium aseptatum has a close relationship with Chloridium gonytrichii F.A. Fernández & Huhndorf (= Melanopsammella gonytrichii ) (100/99/1.00). Morphologically, C. gonytrichii has lateral conidiogenous cells, which is very different from C. aseptatum ( Fernández et al. 2005) . C. aseptatum is most similar to Chloridium xigazense Y.M. Wu & T.Y. Zhang in having flaring collarette and proliferating conidiogenous cells, and conidia produced singly, but conidia of the latter species is often adhering in chains and with a dark hilum at the subtruncate ( Wu & Zhang 2013).

Figures

FIGURE 2. Chloridium aseptatum (holotype, MFLU11-1051). a–b. Colonies on substrate. c. Germinating conidia d. Conidiophores from culture. e–j. Proliferating conidiophores bearing conidia. f. is from culture. k–l. Conidia. m–n. Culture on PDA. Bars: b–d = 50 μm, e = 30 μm, f = 110 μm, g = 25 μm, h = 35 μm, i = 20 μm, j = 30 μm, k–l = 15 μm.