Tubeufia geniculata
Tubeufia geniculata (C.H. Kuo & Goh) Y.Z. Lu & K.D. Hyde
≡ Helicomyces geniculatus C.H. Kuo & Goh, Mycoscience (2018)
Index Fungorum number: IF 554914; Facesoffungi number: FoF 04820
Etymology: geniculatus, referring to the distinct geniculation of conidiophores.
Holotype: TNM F31100
Sexual morph Undetermined. Asexual morph Colonies on natural substratum effuse, white, arachnoic, ceraceous, coarsely flocculose, forming cottonlike mycelium layer. Mycelium mostly superficial, partly immersed, composed of branched, septate, subhyaline to pale brown, smooth hyphae. Stalked sclerotia often present, yellowish brown to medium brown, spherical, muriform, 14–23.5 µm in diam. Setae arising from superficial mycelium, branched, multiseptate, up to 120 µm long, 4–6 µm wide, uniform in width, subhyaline to pale brown, gradually becoming hyaline toward the rounded apex, sterile or bearing conidiophores. Conidiophores macronematous, mononematous, arising as lateral branches from creeping hyphae or as a single lateral branch from the setae, short, unbranched, distinctly geniculate due to sympodial proliferation of conidiogenus cell, subhyaline
to very pale brown, 5–8-septate, 23–50 µm long, 4–6 µm wide. Conidiogenous cells polyblastic, sympodial. Conidia acrogenous, dry, holoblastic, attached eccentrically, seceding schizolytically
from conidiogenous cells and leaving a refractive scar on the conidiogenous loci, hyaline, hygroscopic, 29–36 µm in diam.
Material examined: CHINA, Taiwan, Chiayi County, Juchi Township, on decaying wood submerged in a freshwater stream, 5 February 2017, Chang-Hsin Kuo, NCYU-U2-1 (TNM F31100, holotype).
Notes: This species was introduced as Helicomyces geniculatus by Kuo and Goh (2018) based on phylogeny and morphology. However, we compare its morphology with our new collections and other known Helicomyces species, and its morphology does not correspond to the generic concept of Helicomyces but fits well into Tubeufia. Furthermore, our phylogenetic result shows that two isolates of H. geniculatus (BCRC FU30849 and NCYU U2-1B) cluster within Tubeufia and share a sister relationship to Tubeufia abundata with good bootstrap support, and phylogeny support that they are distinct species (Lu et al. 2018). Therefore, we synonymize it under Tubeufia as T. geniculata. (Lu et al. 2018)
Freshwater distribution: Taiwan, China (Kuo and Goh 2018; Lu et al. 2018)
Fig 1 Helicomyces geniculatus (TNM F31100, holotype). A Colonies on natural substratum. The erect setae are clearly visible. B Group of conidia, setae, conidiophores, and sclerotia. C Branched hyphae, conidiophores, and sclerotia. D Highlight of a sclerotium. E A conidiophore with geniculations, arising as lateral branch from the shaft of branched setae, and producing conidia. F A conidiophore with geniculations, producing conidia. Scale bars: A = 200 µm, B–F = 20 µm. (Kuo and Goh 2018)
Fig 2 Helicomyces geniculatus (TNM F31100, holotype). A, B Conidiophores bearing conidia. C A conidiophore showing distinct geniculations. D A conidiophore arising as a lateral branch from the seta. E–K Conidia. Scale bars: 20 µm. (Kuo and Goh 2018)
References
Lu YZ, Liu JK (Jack), Hyde KD, Jeewon R, Kang JC, Fan C, Boonmee S, Bhat DJ, Luo ZL, Lin CG, Eungwanichayapant PD (2018) A taxonomic reassessment of Tubeufiales based on multi-locus phylogeny and morphology. Fungal Divers 92:131–344. https://doi.org/10.1007/s13225-018-0411-y
Kuo CH, Goh TK (2018) A new species and a new record of Helicomyces from Taiwan. Mycoscience 59:433–440. https://doi.org/10.1016/j.myc.2018.04.002
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