Chaetarthriomyces crassiappendicatus Scheloske

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 108-110

Chaetarthriomyces crassiappendicatus Scheloske

MB#327992

Fig. 22A–B

Parasitologische Schriftenreihe 19: 97 ( Scheloske 1969; as C. crassappendicatus ). –

Type: [In?] “Auf den Elytren und nahe der Basis der Schenkel der Hinterbeine von Chaetarthria seminulum (Col. Hydrophilidae ). Die Wirte stammen von einer feuchten Wiese in Ufernähe des Hembach bei Schwand/ Nürnberg sowie aus dem flachen Wasser (zwischen Pflanzen) eines Weihers bei Dechsendorf/Erlangen, Deutschland. Holotypus Abb. 10”. [ Germany]

Diagnostic features

Primary appendage consisting of 5–6 isodiametric cells culminated with a rounded uppermost cell; the intermediate cells separate 1–2 small and short antheridia at one or at opposite sides ( Fig. 22A , arrows). Perithecium showing a short neck and a ± bent, asymmetric, subacute apex. [Detailed descriptions: Majewski 1994b; Santamaria 2003]

Distribution and hosts

On Chaetarthria (Col. Hydrophilidae ) from Germany (type), Poland ( Majewski 1972a), Spain ( Santamaria 1989), United Kingdom (Weir 1996), Sweden ( Huggert 2010), and the Netherlands (Haelewaters et al. 2014).

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-123215 .

Remarks

First record from Denmark. The finding of this species in Denmark was expected by its presence in the neighbouring countries. The thalli of this fungus can easily be overlooked due to their small size.

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).