Hydrophilomyces gracilis T.Majewski

MB#315332

Fig. 7D–E

Acta Mycologica 10: 272 (Majewski 1974). –

Type: “ On Cercyon granarius Er. (Col., Hydrophilidae): Kurzeszyn Nowy, Rawa Mazowiecka county, on flooded meadows near the Rawka River, 18.8.1972 leg. T. Majewski (TM. 1076 – holotype)”; KRAM. [Poland]

Diagnostic features

Receptacle slender, consisting of up to 44 flattened cells. Buffer cells absent. Perithecial neck straight. [Detailed description: Majewski 1994b]

Distribution and hosts

On Cercyon (Col. Hydrophilidae) from Poland (type), Greece (Castaldo et al. 2004), and maybe from Belgium (De Kesel et al. 2020).

Collections examined from Denmark

On Cercyon littoralis (Gyllenhal, 1808) (Col. Hydrophilidae)

DENMARK – Lolland, Falster, Møn (LFM) • Tjørnebjerg ved Kramnitse; 54°41.586′ N, 11°16.980′ E; PF46; 19 May 2019; JP 1463; JP det.; ZMUC C-F-124043 . – Nordøstsjaelland (NEZ) • Boserup Strand; 55°40.086′ N, 12°1.806′ E; UB17; 11 May 1900; coll. unknown Dry0031; unknown det.; ZMUC C-F-124101 . – Nordvestsjaelland (NWZ) • Bjerge Sydstrand; 55°33.493′ N, 11°9.730′ E; PG35; 1 May 2013; JP 300; JP det.; ZMUC C-F-122779 .

On Cercyon marinus Thomson, 1853 (Col. Hydrophilidae)

DENMARK – Lolland, Falster, Møn (LFM) • Mandemarke; 54°58.014′ N, 12°29.479′ E; UA39; 8–13 Jun. 2013; O. Karsholt 178; JP det.; ZMUC C-F-122657 .

Remarks

First record from Denmark. According to the large quantity of Cercyon studied without success, this and the next species may be considered as very rare. This species grows on the tip of the elytra.