Ceratomyces pyrenaeus Santam.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 29

Ceratomyces pyrenaeus Santam.

MB#460468

Fig. 2F–H

Nova Hedwigia 68 (3–4): 352 (Santamaria 1999). –

Type: SPAIN • “ Lleida ( Lérida ): Vielha e Mijaran ; Pleta de Mulleres , Boca Sud del Túnel de Vielha , below the margins of pronotum and elytra of Hydrobius fuscipes (Linné) ( Coleoptera, Hydrophilidae , Hydrophilinae ), 17.V.1986, leg. C. Hernando, SS1805c (Holotype)”; BCB .

Diagnostic features

Perithecial apex bearing two horn-like excrescences on opposite sides ( Fig. 2G , arrows): one on the ventral side which is conspicuous, rigid, sigmoidal, and the other on the dorsal side which is broadened at the base and rounded at the apex. Both horns are formed by distal outer wall cells.

Distribution and hosts

Until now, the species was only known from the type. Other than the Danish material newly reported here, it is worth to mention its hitherto unreported presence in USA, according to a slide sent by Dr Richard Benjamin to SS many years ago which was labelled: “on anterior inflexed margins of elytra of Hydrobius fuscipes (L.), Wyoming, Albany Co, Pole Mountain, Wildlife Refuge, 5 May 1949, G.K.Todd coll. RKB1755” (slide is kept in BCB with the number SSE·355).

Collections examined from Denmark

On Hydrobius rottenbergii Gerhardt, 1872 (Col. Hydrophilidae )

DENMARK – Nordøstsjaelland (NEZ) • Amager Faelled ; 55°38.631′ N, 12°34.729′ E; UB47; 15 Apr. 2018; JP 1036; JP det.; ZMUC C-F-123550 , C-F-123551 .

Remarks

First record from Denmark. The distribution of this species is very patchy, probably due to lack of research. The host was previously considered as a subspecies of Hydrobius fuscipes (Linnaeus, 1758) .

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).