Tubeufiales » Tubeufiaceae

Pseudohelicoon

Pseudohelicoon Y.Z. Lu & K.D. Hyde, in Lu et al., Fungal Diversity 92: 254 (2018).

 Index Fungorum number: IF 554919; Facesoffungi number: FoF 04748, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on submerged decaying woody substrate. Sexual morph: Unknown. Asexual morph: Hyphomycetous, helicosporous. Colonies on natural substratum dark-brown, somewhat glistening, effuse. Mycelium partly immersed but mostly superficial, consisting of branched hyphae and short conidiophores bearing conidia, pale yellowish-brown, smooth, branched, closely septate, slightly constricted at the septa. Conidiophores macronematous, mononematous, cylindrical, erect, straight, arising as short branches more or less at right angles to the subtending hyphae, yellowish-brown or somewhat darker than the subtending hyphae, unbranched, aseptate, smooth walled. Conidiogenous cells monoblastic, integrated, terminal, determinate. Conidia solitary, dry, acrogenous, medium brown, helicoid, smooth, distinct multiseptate, slightly constricted at the septa, tightly coiled 7–13 times in a clockwise direction to form a subglobose or broadly elliptical body, usually incorporated with mucilaginous substances such that no gaps are visible between adjacent coils, non-hygroscopic; conidial secession schizolytic at the delimitating septum of the conidiogenous cell, giving rise to a short pedicel at the base (Goh & Hyde 1996, Goh & Kuo 2018, Lu et al. 2018).

Type species: Pseudohelicoon subglobosum (Goh & C.H. Kuo) Y.Z Lu & Hyde

Notes: Pseudohelicoon was introduced by Lu et al. (2018) with P. subglobosum as type species. Pseudohelicoon is characterised by dark-brown effuse colonies, superficial pale yellowish-brown mycelium, yellowish-brown micronematous conidiophores, monoblastic conidiogenous cells, dry, acrogenous subglobose or broadly elliptical conidia. Pseudohelicoon resembles Helicoon in having nonproliferating, ellipsoidal to doliiform conidia. Helicoon is polyphyletic with species distributed among the Orbiliales (Goh & Kuo 2018) and Pleosporales (Tsui & Berbee 2006, Goh & Kuo 2018). Pseudohelicoon phylogenetically belongs to Tubeufiaceae and can be differentiated from Helicoon based on DNA sequence data. Molecular markers available for Pseudohelicoon are ITS and LSU.

 

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