Helicotruncatum
Helicotruncatum Y.Z. Lu, J.C. Kang & K.D. Hyde, in Lu et al., Fungal Diversity 92: 220 (2018).
Index Fungorum number: IF 554859; Facesoffungi number: FoF 04730, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on decaying wood. Sexual morph: Unknown. Asexual morph: hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, velvety black; on corn meal agar, slow-growing, thin, effused brownish grey. Mycelium composed of brownish grey hyphae. Conidiophores macronematous, mononematous, cylindrical, erect, stout, unbranched, septate, brownish grey, smooth-walled. Conidiogenous cells holoblastic, monoblastic, integrated, sympodial, cylindrical, terminal, or lateral due to proliferation of the conidiophore, truncate at apex after conidial secession, with broad, flat point of conidial attachment, smooth-walled. Conidia solitary, acropleurogenous, helicoid, the basal cell truncate with thickened lateral walls, coiled 1–2 times, not becoming loose in water, 10–16-septate, dilute fuliginous, smooth-walled (adapted from Lu et al. 2018).
Type species: Helicotruncatum palmigenum (Penz. & Sacc.) Y.Z. Lu & K.D. Hyde
Notes: Helicotruncatum is characterised by macronematous, mononematous, cylindrical, erect conidiophores, holoblastic, monoblastic, integrated conidiogenous cells, and solitary, acropleurogenous, helicoid conidia. Helicotruncatum differs from other genera in Tubeufiaceae in having conidiophores and conidia with a thickened lateral wall. Helicotruncatum palmigenum was introduced as Helicoma palmigenum by Linder (1929) based on the size of the conidia and number of septa. Matsushima (1971) described a new record of Helicoma palmigenum. Goos (1986) studied Matsushima’s specimen and synonymized Helicoma westonii under H. palmigenum based on morphology. Tsui and Berbee (2006) provided ITS and LSU sequence data (NBRC 32663) for H. palmigenum. In the phylogenetic analysis of Lu et al. (2018), H. palmigenum clustered in a distinct lineage far from Helicoma and hence was accommodated in the new genus Helicotruncatum. Hongsanan et al. (2020b) provided a new geographical record for H. palmigenum from freshwater in Thailand. Helicotruncatum is morphologically and phylogenetically a distinct genus in Tubeufiaceae. Molecular markers available for Helicotruncatum are ITS, LSU, SSU, RPB2 and TEF-1.
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