Chaetarthriomyces spiralis Santam.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 110

Chaetarthriomyces spiralis Santam.

MB#474853

Fig. 22C–D

Nova Hedwigia 72 (3–4): 379 ( Santamaria 2001a). –

Type: “ Spain. Jaén: Santiago–Pontones , Parque Natural de Cazorla , Segura y Las Villas , río Aguamulas , below the head of Chaetarthria seminulum (Herbst) ( Coleoptera, Hydrophilidae ), 12.V.1990, leg. S. Santamaria, BCB–Mycotheca SS·0945 [Holotypus]”; BCB.

Diagnostic features

Primary appendage strongly arcuate, consisting of up to 12 isodiametric cells culminated with a rounded uppermost cell. Perithecium with a blunt apex, with the wall cells spirally arranged and distinctively brown-pigmented ( Fig. 22D ). [Detailed description: Santamaria 2003]

Distribution and hosts

Grows on the underside of the head of Chaetarthria (Col. Hydrophilidae ) in Spain (type) and Poland ( Majewski 2008).

Collections examined from Denmark

On Chaetarthria seminulum (Herbst, 1787) (Col. Hydrophilidae )

DENMARK – Nordvestsjaelland (NWZ) • Flyndersø ved Dybesø ; 55°58.151′ N, 11°45.621′ E; PH60; 4 Nov. 2017; JP 722; JP det.; ZMUC C-F-123214 .

Remarks

First record from Denmark. This species is much larger and significantly less frequent than C. crassiappendicatus . The development of two viable perithecia on the same thallus is exceptional ( Fig. 22D ).

Figures

Fig. 22. Chaetarthriomyces spp. A–B. C. crassiappendicatus Scheloske. Mature thalli with labelled antheridia (arrows). –C–D. C. spiralis Santam. Mature thalli. Scale bars: 50 µm. Photographs from slides ZMUC C-F-123215 (A–B), ZMUC C-F-123214 (C–D).