Tubeufiales » Tubeufiaceae » Pseudohelicomyces

Pseudohelicomyces menglunicus

Pseudohelicomyces menglunicus J.F. Li, Rungtiwa Phookamsak & K.D. Hyde, in Phookamsak et al., Fungal Diversity Notes: 10.1007/s13225-019-00421-w, [87] (2019)

Index Fungorum number: IF555770         Facesoffungi number: FoF05763

 

Sexual morph: Undetermined. Asexual morph: Mycelium immersed on the substrate, composed of septate, branched, smooth, thin-walled, subhyaline to dark brown hyphae. Conidiophores (106–)130–

220 × 9–13(–13.5) μm, macronematous or micronematous, paler towards the apex, hyaline to light brown, thinwalled, smooth, septate, branched, straight or flexuous, cylindrical, tapering towards the apex. Conidiogenous cells (20–) 23.5–32(–36) × (4–)4.5–5.5(–6) μm ( = 4.5 × 5.3 μm, n = 10), holoblastic, integrated, intercalary and sometimes terminal, determinate or sympodial, occasionally small and discrete, denticulate, denticles cylindrical, often narrow, hyaline, smooth. Conidia (18–)20–33(–34) × (21.5–)25–30(–40) μm ( = 22.5 × 27.2 μm, n = 20), pleurogenous or acropleurogenous, solitary, simple, subhyaline to paler yellowish brown, septate, slightly constricted at the septa, planate to cochleate, smooth, thin-walled, hygroscopic.

 

Culture characteristics: Conidia germinating on PDA within 14 h and germ tubes produced from all cells. Colonies growing on PDA, hairy, brown to dark brown, reaching 5 mm in 15 days at 23 °C, mycelium partly superficial, partly immersed, slightly effuse, radially striate, with irregular edge, subhyaline to dark brown; conidia sporulating within 15 days on PDA.

 

 

Material examined: CHINA, Yunnan Province, Xishuangbanna, on unidentified seed, 15 August 2014, J.F.mLi, H-26 (KUN-HKAS 85795, holotype), ex-type living culture, MFLUCC14-0689.

 

GenBank Accession No: ITS = MK335914, SSU = MK335915, TEF1-a = MK335916.

 

Notes: Pseudohelicomyces menglunicus resembles species of Helicosporium Nees and Neohelicosporium Y.Z. Lu et al. in morphological characters, but is obviously unique in conidiophores and conidia. Pseudohelicomyces menglunicus differs from Helicosporium and Neohelicosporium species in having flexuose, branched and hyphae-like conidiophores, and smooth-walled conidia. In the phylogenetic analysis, P. menglunicus forms a separated lineage, sister to P. aquaticus Y.Z. Lu et al. with moderate support (76% ML and 0.97 BYPP). Jayasiri et al. (2019) introduced a new sexual morph species, P. quercus Jayasiri et al. on fruit of Quercus sp. from Thailand. The species also formed a clade with P. aquaticus and P. menglunicus (pre-analysis, data not shown). A comparison of ITS and TEF1-a nucleotide bases shows that P. menglunicus differs from P. quercus in 37/569 bp (6.5%) of ITS and 28/912 bp (3.1%) of TEF1-a. Hence, P. menglunicus is introduced as a new asexual morph species.