Eusynaptomyces hydrobii (T.Majewski) I.I.Tav.

Santamaria, Sergi & Pedersen, Jan, 2021, Laboulbeniomycetes (Fungi, Ascomycota) of Denmark, European Journal of Taxonomy 781, pp. 1-425 : 30-32

Eusynaptomyces hydrobii (T.Majewski) I.I.Tav.

MB#105312

Fig. 3B–D

Mycologia Memoirs 9: 220 ( Tavares 1985). – Basionym: Rhynchophoromyces hydrobii T.Majewski, Acta Mycologica 7(2): 274 ( Majewski 1972a) [MB#322804]. –

Type: “ On metasternum of Hydrobius fuscipes L. (Col., Hydrophilidae ): Lomianki Dolne , Nowy Dwor Maz. county, small water body south of village, 24.4.1970, leg. T. Majewski ”; KRAM. (fig. 7a – holotype,…) ( TM 245 , Majewski, 2008: 69). [ Poland]

Diagnostic features

Receptacle very variable in length and number of cells, consisting of 11–80 superposed cells. Perithecium nearly straight to ± arcuate, with an almost undistinguished venter, tapering distally to an undifferentiated, rounded apex. [Detailed descriptions: Sarna & Milewska 1978; Majewski 1994b]

Distribution and hosts

Only known from Poland on Hydrobius and Hydrophilus Geoffroy, 1762 (Col. Hydrophilidae ).

Collections examined from Denmark

On Hydrobius rottenbergii Gerhardt, 1874 (Col. Hydrophilidae )

DENMARK – Nordøstsjaelland (NEZ) • Amager Faelled ; 55°38.631′ N, 12°34.729′ E; UB47; 15 Apr. 2018; JP 1036; JP det.; ZMUC C-F-123552 .

Remarks

First record from Denmark. Second world record, the first outside the type country. The separation of this species from reduced forms of Eusynaptomyces benjaminii Scheloske is difficult because such thalli lack the horn on the perithecial apex, which is not the case for the Danish thalli. The host was previously considered as a subspecies of Hydrobius fuscipes . A photo of this species is given here for the first time.

Figures

Fig. 3. A. Eusynaptomyces enochri Scheloske; reduced form showing the lateral outgrowth (arrow). – B–D. Eusynaptomyces hydrobii (T.Majewski) I.I.Tav.; mature thalli. – E. Rhynchophoromyces anacaenae Scheloske; mature thallus with broken appendage. –F. Thripomyces italicus Speg.; mature thallus showing the characteristic broadened cells at the base of the receptacle (*). Scale bars: 50 µm. Photographs from slides ZMUC C-F-122569 (A), ZMUC C-F-123552 (B–D), ZMUC C-F-123749 (E), and ZMUC C-F- 122983 (F).