Introducing Dictyochaeta aquatica sp. nov. and two new species of Chloridium (Chaetosphaeriaceae, Sordariomycetes) from aquatic habitats Author Wei, Ming-Jie Yunnan Institute of Food Safety, Kunming University of Science & Technology, Kunming 650500, People’s Republic of China Author Zhang, Huang Yunnan Institute of Food Safety, Kunming University of Science & Technology, Kunming 650500, People’s Republic of China Author Dong, Wei Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai, 50200, Thailand & Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand Author Boonmee, Saranyaphat Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand Author Zhang, Di text Phytotaxa 2018 2018-07-24 362 2 187 199 http://dx.doi.org/10.11646/phytotaxa.362.2.5 journal article 10.11646/phytotaxa.362.2.5 1179-3163 13702920 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. 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. 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 ).