Helodiomyces elegans F.Picard

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 24-26

Helodiomyces elegans F.Picard

MB#239522

Fig. 2A–C

Bulletin de la Société Mycologique de France 29: 558 ( Picard 1913). –

Type: [Not designated] [Ind. loc.] [Type lost!] “Sur le dessous et les côtés du corps de Parnus prolifericornis F., ruisseau du Verdanson, derrière l’École d’Agriculture, Montpellier (Hérault); et sur Parnus hygrobates Kies. , mare de Gramont, environs de Montpellier (commune de Castelnau)”. [France]

Diagnostic features

See the genus description. [Detailed descriptions: Majewski 1994b; Santamaria 2003; De Kesel & Haelewaters 2014b]

Distribution and hosts

Common on Dryops Olivier, 1791 (= Parnus Fabricius, 1792 ) (Col. Dryopidae ) from Europe ( France, Poland, United Kingdom, Germany, Italy, Finland, Hungary, Spain, Andorra) and Africa ( Algeria) ( Majewski 2008). Recently reported from Czech Republic ( Rossi et al. 2010), Sweden ( Huggert 2010), the Netherlands ( Haelewaters et al. 2012), and Belgium ( De Kesel & Haelewaters 2014b).

Collections examined from Denmark

On Dryops anglicanus Edwards, 1909 (Col. Dryopidae )

DENMARK – Sydsjaelland (SZ) • Holmegårds Mose ; 55°17.685′ N, 11°47.928′ E; PG73; 26 Apr. 2020; JP 1606; JP det.; ZMUC C-F-124360 .

On Dryops auriculatus (GeoffroY, 1785) (Col. DrYoPIdAe )

DENMARK – Lolland, Falster, Møn (LFM) • Ulvshale ; 55°2.301′ N, 12°16.244′ E; UB20; 27 Apr. 2013; JP 180; JP det.; ZMUC C-F-122659 . – Nordøstjylland (NEJ) • Gammel Enge i Tofte Skov ; 56°49.175′ N, 10°13.763′ E; NH79; 24 May 2005; JP 108; JP det.; ZMUC C-F-122585 . – Sydjylland (SJ) • Lakolk ; 55°8.325′ N, 8°29.618′ E; MG61; 31 May 2013; JP 107; JP det.; ZMUC C-F-122583 .

On Dryops griseus (Erichson, 1847) (Col. Dryopidae )

DENMARK – Lolland, Falster, Møn (LFM) • Ulvshale ; 55°2.301′ N, 12°16.244′ E; UB20; 27 Apr. 2013; JP 179; JP det.; ZMUC C-F-122658 .

On Dryops luridus (Erichson, 1847) (Col. Dryopidae )

DENMARK – Østjylland (EJ) • Klostermølle ; 56°2.432′ N, 9°41.629′ E; NH41; 14 Feb. 2019; JP 1352; JP det.; ZMUC C-F-123891 .

On Dryops similaris Bollow, 1936 (Col. Dryopidae )

DENMARK – Nordøstsjaelland (NEZ) • Amager Faelled ; 55°38.631′ N, 12°34.729′ E; UB47; 15 Apr. 2018; JP 1035; JP det.; ZMUC C-F-123547 • Asserbo Plantage ; 56°1.984′ N, 12°0.817′ E; UC11; 28 Apr. 2019; JP 1454; JP det.; ZMUC C-F-124005 .

Remarks

First record from Denmark. Only the length and number of receptacular cells is variable depending on where the thalli grow on host body.

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).