Hydrophilomyces atroseptatus T.Majewski

MB#363459

Fig. 6G

Polish Botanical Studies 7: 56 (Majewski 1994b). –

Type: “ On Limnebius aluta (Bedel), Sw. Smolniki, 12.8.1974, leg. A. Sarna (T.M. 1482 – Holotype)”; KRAM. [Poland]

Diagnostic features

Main appendage axis with dark constricted septa separating secondary branchlets or antheridia from corner cells (Fig. 6G, arrows); stout, not exceeding the perithecial apex, consisting of 9–12 flattened cells. [Detailed description: Santamaria 2003]

Distribution and hosts

Known from Poland (type) and Spain on Limnebius (Col. Hydraenidae) (Santamaria 2001a). According to Majewski (2008) the record of Hydrophilomyces limnebii on L. aluta (Balazuc 1990) from France probably belongs to H. atroseptatus .

Collections examined from Denmark

On Limnebius aluta Bedel, 1881 (Col. Hydraenidae)

DENMARK – Nordøstsjaelland (NEZ) • Storø i Gurre Sø; 56°2.208′ N, 12°29.057′ E; UC41; 7Apr. 2020; JP 1628; JP det.; ZMUC C-F-124366 . – Sydjylland (SJ) • Braenøre Mose; 55°23.906′ N, 9°25.714′ E; NG23; 5 Aug. 2018; JP 1168; JP det.; ZMUC C-F-123693 .

Remarks

First record from Denmark. The Danish material consists only of young thalli. Nevertheless the distinctive dark septa of this species confirm its classification (Fig. 6G, arrows). Hydrophilomyces limnebii also occurs on Limnebius, but may be easily distinguished by the absence of dark septa in corner cells and by the strongly bent perithecium. A photo of H. atroseptatus is given here for the first time, although in immature condition.