Pleosporales » Phaeoseptaceae » Pleopunctum

Pleopunctum pseudoellipsoideum

Pleopunctum pseudoellipsoideum N.G. Liu, K.D. Hyde & J.K. Liu

Index Fungorum number: IF556524; Facesoffungi number: FoF 06115

Etymology: in reference to its similar morphology with P. ellipticum

Holotype: MFLU 19-0686

 

Saprobic on submerged wood. Sexual morph: Undetermined. Asexual morph: Colonies clustered in several small groups, sporodochial, punctiform, black, shining. Mycelium partly immersed in natural substratum, composed of hyaline to pale brown, septate hyphae. Conidiophores reduced to conidiogenous cells. Conidiogenous cells up to 19.5 μm long, 3.5 μm wide, holoblastic, monoblastic, integrated, determinate, cylindrical, easily broken off, pale brown to brown, smooth-walled, thick-walled. Conidia 35.5–66 × 26.5–40 μm (subtending cells included) (x̄ = 51.5 × 30 μm, n = 15), solitary, dry, ellipsoidal, subglobose, subcylindrical or obovoid, rounded at the apex, multi-septate, muriform, slightly constricted at the septa, brown to black, paler to hyaline at the base; basal cells (subtending cells) subhyaline to hyaline, cuneiform, always swollen to globose, up to 15 μm diam., straight, smooth, thin-walled. (Descriptions from Dong et al. 2020)

 

Material examined: CHINA, Yunnan Province, Qujing, on submerged wood in a stream, 10 May 2017, C.X. Liu, L43 (HKAS 102147).

 

Notes: HKAS 102147 clusters with Pleopunctum pseudoellipsoideum with high bootstrap support. HKAS 102147 has identical LSU and ITS sequence data with the ex-type strain of P. pseudoellipsoideum (MFLUCC 19-0391) and seven nucleotide differences in TEF sequence data, which indicate they are conspecific. Our collection has wider conidia than the holotype (35.5–66 × 26.5–40 μm vs. 39–59 × 19–28 μm) (Liu et al. 2019). This is a new habitat record for P. pseudoellipsoideum from freshwater. We directly sequenced from conidia because the culture was contaminated. (Notes from Dong et al. 2020)

 

 

Fig. 1 Pleopunctum pseudoellipsoideum (HKAS 102147, new habitat record). a, b Colonies on submerged wood. c–f Conidiogenous cells with conidia. g, h Conidia. Scale bars: c–h = 20 μm

 

References

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Diversity 105:319–575

Liu NG, Hyde KD, Bhat DJ, Jumpathong J, Liu JK (2019) Morphological and phylogenetic studies of Pleopunctum gen. nov. (Phaeoseptaceae, Pleosporales) from China. Mycosphere 10:757–775

 

Recent Genus

1
Neochlamydotubeufia
Neohelicomyces

Recent Species

Neohelicomyces submersus
Neohelicomyces hyalosporus
Neohelicomyces grandisporus