Tubeufiales » Tubeufiaceae » Neohelicosporium

Neohelicosporium taiwanense

Neohelicosporium taiwanense (C.H. Kuo & Goh) Y.Z. Lu & K.D. Hyde

Helicosporium taiwanense C.H. Kuo & Goh, Mycol. Prog. 17 (5): 563 (2018)

Index Fungorum number: IF 554882; Facesoffungi number: FoF 04810

Etymology: taiwanense, referring to the type locality: Taiwan.

Holotype: TNM F31001


Sexual morph: Undetermined. Asexual morph: Colonies on natural substratum effuse, white, finely arachnoid. Mycelium mostly superficial and partly immersed, composed of branched, septate hyphae, 2.5−4.5 μm wide. Stalked sclerotia absent. Conidiophores macronematous, mononematous, unbranched or branched, anastomosing, straight or flexuous, bearing small cylindrical conidiogenous denticles or short lateral conidiogenous branches along the shaft, occasionally geniculate, bearing several denticles at the apex, uniformly pale grayish brown, darker at the base, distinctly multiseptate (14−18), sometimes slightly constricted at the septa, 100−340 μm long, 4.7−5.4 μm wide. Conidiogenus cells mono- or more commonly polyblastic, integrated, determinate or with sympodial proliferations, cylindrical and bearing tooth-like projections; denticles distinct, cylindrical, 2.2−3.7 × 1−1.5 μm. Conidia hyaline, (34.7−)37−48(−53) μm diam, coiled (1.5−)2−2.25(−2.5) times; conidial filament hygroscopic, smooth-walled, 20−34-septate, (3.8−)4−5(−5.5) μm thick, conidial secession schizolytic. Secondary conidia absent. (Description from Kuo and Goh 2018)


Material examined: CHINA, Taiwan, Chiayi County, Juchi Township, on debarked wood submerged in a freshwater stream, 5 Feb. 2017, Chang-Hsin Kuo, NCYU-K1-1 (TNM F31001, deposited at National Museum of Natural Science, Taichung, Taiwan).


Notes: This taxon was described as Helicosporium taiwanense by Kuo and Goh (2018). However, our phylogenetic result shows that this taxon (BCRC FU30841) grouped within the genus Neohelicosporium and shares a sister relationship to N. laxisporum and N. irregulare with high bootstrap support. Furthermore, its morphology fits well into the generic concept of Neohelicosporium rather than Helicosporium. Therefore, we synonymize this taxon under Neohelicosporium as N. taiwanense. (Notes from Lu et al. 2018)


Freshwater distribution: Taiwan, China (Kuo and Goh 2018)


Fig. 6

Fig 1 Helicosporium taiwanense (TNM F31001, holotype). a, b Colonies on natural substratum. c Conidiophores and conidia. d−f Higher magnification of conidiophores showing conidiogenous denticles and conidial initials. g−v Conidia. Scale bars: a = 500 μm, b = 200 μm, c−v = 20 μm (Kuo and Goh 2018)