Hydrophilomyces digitatus F.Picard

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 49

Hydrophilomyces digitatus F.Picard

MB#195295

Fig. 7C

Bulletin de la Société Mycologique de France 25: 245 ( Picard 1910). – Ecteinomyces digitatus (F.Picard) Thaxt. ( Thaxter 1912a: 212) [not registered in MB]. – Misgomyces digitatus (F.Picard) Thaxt. ( Thaxter 1931: 297) [MB#263206]. –

Type: [Type lost!] [Ind. loc.] “Fixé, par paquets de nombreux individus, à la face inférieure de l’élytre gauche d’ Ochthebius marinus Paykull. … Très commun à Trappes (Seine-et-Oise) dans les canaux attenant à l’étang de St.-Quentin” [France]

Diagnostic features

Receptacle consisting of 6–14 superposed cells, curved to strongly arcuate. Perithecium rather variable, straight to arcuate, broadest near the basal quarter, abruptly tapering towards a narrow, cylindrical neck, then broadened at the level of the septa between w 2 and w 3. [Detailed description: Santamaria 2003]

Distribution and hosts

Known on Ochthebius (Col. Hydraenidae ) from France (type), Sweden, Portugal and Spain ( Santamaria 2003).

Collections examined from Denmark

On Ochthebius marinus (Paykull, 1798) (Col. Hydraenidae )

DENMARK – Lolland, Falster, Møn (LFM) • Keldskov ; 54°39.681′ N, 11°33.593′ E; PF66; 15 Oct. 2019; JP 1516; JP det.; ZMUC C-F-124271 . – Nordøstsjaelland (NEZ) • Kalvebod Faelled ; 55°35.117′ N, 12°32.693′ E; UB46; 24 Mar. 2020; JP 1638; JP det.; ZMUC C-F-124368 .

On Ochthebius minimus (Fabricius, 1792) (Col. Hydraenidae )

DENMARK – Lolland, Falster, Møn (LFM) • Røgbølle Sø ved Sørup ; 54°42.608′ N, 11°34.757′ E; PF66; 15 Oct. 2019; JP 1519; JP det.; ZMUC C-F-124274 .

Remarks

First record from Denmark. The classification of Hydrophilomyces species occurring on Ochthebius is difficult. Further studies using modern molecular techniques are needed. Hydrophilomyces digitatus is best separable from other species by the absence of any remarkable character.

Figures

Fig. 7. Hydrophilomyces spp., mature thalli. A–B. H. coneglianensis Speg. Thallus from female (A) and from male hosts (B). – C. H. digitatus F.Picard. – D–E. H. gracilis T.Majewski. – F–G. H. hamatus T.Majewski. Abbreviations: acc = accessory cell; bf = buffer cells. Scale bars: 50 µm. Photographs from slides ZMUC C-F-122709 (A), ZMUC C-F-124088 (B), ZMUC C-F-124274 (C), ZMUC C-F-124043 (D–F), and ZMUC C-F-124042 (G).