Tubeufiales » Tubeufiaceae » Neohelicosporium

Neohelicosporium parvisporum

Neohelicosporium parvisporum Y.Z. Lu, J.C. Kang & K.D. Hyde

Index Fungorum number: IF822056; Facesoffungi number: FoF 03571

Holotype: HKAS 97445.

Etymology: ‘parvisporum’ referring to smaller conidia than the other species.

 

Saprobic on submerged decaying wood. Sexual morph: Undetermined. Asexual morph: hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, white to light pink. Mycelium composed of partly immersed, partly superficial, hyaline to pale brown, septate, abundantly branched hyphae, with masses of crowded, glistening conidia. Conidiophores up to 420 μm long, 3.5–4.5 μm wide, micronematous, mononematous, flexuous, cylindrical, branched, septate, pale brown, smooth-walled. Conidiogenous cells 14.5–22.5 μm long, 3.5–4.5 μm wide, holoblastic, mono- to polyblastic, integrated, intercalary, cylindrical, with denticles, pale brown, smooth-walled. Conidia 14–24.5 μm diam. and conidial filament 2–4 μm wide ( = 18 μm diam., 3 μm wide, n = 50), 100–160 μm long, tightly coiled 2.5–3.25 times, becoming loosely coiled in water, rounded at the tip, multi-septate, verrucose, guttulate, hyaline.

 

Material examined: CHINA, Guangxi Province, He Chi City, on submerged decaying wood in a freshwater stream, 18 May 2016, Yong-Zhong Lu, XSL09-2 (HKAS 97445, holotype; GZAAS 16-0100, isotype); ex-type living culture, MFLUCC 17-1523 = GZCC 16-0088; CHINA, Guangxi Province, Fang Cheng Gang City, on submerged decaying wood in a freshwater stream, 14 May 2016, Yong-Zhong Lu, PF01-3 (GZAAS 16-0090, paratype), living culture, GZCC 16-0078; Ibid., PF08-2 (GZAAS 16-0112, paratype), living culture, GZCC 16-0100; THAILAND, Phang-Nga, Thap Put, Tham Thong Lang, on submerged decaying wood in a freshwater stream, 17 December 2015, Saranyaphat Boonmee, TL01-2 (MFLU 17-1154, paratype), living culture, MFLUCC 16-0218.

 

Notes: Neohelicosporium parvisporum was introduced by Lu et al. (2018), which was collected from a freshwater habitat. Phylogenetic analysis of combined ITS, LSU and TEF1-α sequence data showed that our isolate (MFLUCC 21-0107) clusters among isolates of N. parvisporum without statistical support. Our isolate has similar conidial and conidiophore morphology to N. parvisporum (MFLUCC 17-1523). However, our isolate has smaller conidiogenous cells (8–12 × 2.5–5 vs. 14.5–22.5 × 3.5–4.5 μm) and larger conidia (13.5–33 × 14–24.5 μm). A comparison of the ITS nucleotides of N. parvisporum (MFLUCC 17-1523 = GZCC 16-0088) and the new strain (MFLUCC 21-0107) revealed 9/550 (1.64%) nucleotide differences. (Notes from Boonmee et al. 2021)

 

Freshwater distribution: China (Lu et al. 2018), Thailand (Lu et al. 2018; Boonmee et al. 2018)