Helodiomyces F.Picard

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 24

Genus Helodiomyces F.Picard

MB#2266

Bulletin de la Société Mycologique de France 29: 557 ( Picard 1913). –

Type species: H. elegans F.Picard (by monotypy).

Brief description

Monoecious. Receptacle multicelled and uniseriate. Primary appendage subtended by cell VII ( Fig. 2A , VII). Perihecium solitary with a base consisting of two parallel cells (VI and VI’) ( Fig. 2A , VI, VI’). Outer wall of perithecium consisting of four vertical rows of many cells. An extra, short row of cells on the posterior side of the perithecium. Perithecial ostiole surrounded by four slender and rather long ligules ( Fig. 2C , li).

Remarks

Monotypic. Seems not to be closely related with any other genus of Laboulbeniales .

Figures

Fig. 2. A–C. Helodiomyces elegans F.Picard. A. Mature thallus with labelling of cells VI, VI’ and VII. B–C. Details of perithecium, including ligules (li) in C. – D. Autoicomyces aquatilis (F.Picard) I.I.Tav.; mature thallus showing the perithecial outgrowth (arrow). – E. Autoicomyces humilis (Thaxt.) Thaxt.; mature thallus at the base of a host claw, and a sporeling on the right. – F–H. Ceratomyces pyrenaeus Santam.; mature thalli showing labelled perithecial excrescences (arrows in G). Scale bars: 50 µm. Photographs from slides ZMUC C-F-122583 (A–C), ZMUC C-F-122567 (D), ZMUC C-F-122566 (E), ZMUC C-F-123551 (F), and ZMUC C-F-123550 (G–H).