Siemaszkoa ptenidii (Scheloske) I.I.Tav. & T.Majewski

MB#323555

Fig. 13A–C

Mycotaxon 3: 204 (Tavares & Majewski 1976). – Basionym: Misgomyces ptenidii Scheloske, Parasitologische Schriftenreihe 19: 135 (Scheloske 1969) [MB#334359]. –

Type: “ In einzelnen Exemplaren auf Halsschild und Elytren von Ptenidium sp. ( Pt. fuscicorne ?) (Col. Ptiliidae). – Die Funde stammen aus dem Gesiebe (Bodenstreu) aus Erlenbruchwäldern bei Schwand/Nürnberg und aus Genist an Weihern bei Dechsendorf/Erlangen. Deutschland. Holotypus Abb. 36”. [Germany]

Diagnostic features

Receptacle consisting of 5–9 superposed cells (cell I included). Appendage unbranched, seeming like a prolongation of the receptacle axis. Antheridia unknown. Perithecium narrow and elongate, lateral to the thallial axis. Perithecial apex asymmetric, showing a protruding lip (Fig. 13A, *). [Detailed descriptions: Majewski 1991, 1994b]

Distribution and hosts

Only known from Germany (type), Poland (Majewski 1973c), and Belgium (De Kesel et al. 2020). Occurs on Ptenidium (Col. Ptiliidae).

Collections examined from Denmark

On Ptenidium fuscicorne Erichson, 1845 (Col. Ptiliidae)

DENMARK – Fyn (F) • Gyldenstens inddaemmede Strand; 55°34.447′ N, 10°7.211′ E; NG75; 2 Apr. 2014; JP 684; JP det.; ZMUC C-F-123172 • Rishave; 55°33.475′ N, 10°24.013′ E; NG85; 19 Apr. 2018; JP 1066; JP det.; ZMUC C-F-123583 . – Lolland, Falster, Møn (LFM) • Ulvshale; 55°2.636′ N, 12°15.638′ E; UB20; 26 May 2018; JP 1113; JP det.; ZMUC C-F-123633 • Vest for Bandholm; 54°50.303′ N, 11°28.050′ E; PF57; 3 Jan. 2019; JP 1341; JP det.; ZMUC C-F-123880 . – Nordøstjylland (NEJ) • Syd for Krogsagergård; 56°37.534′ N, 9°45.551′ E; NH47; 24 Nov. 2019; JP 1551; JP det.; ZMUC C-F-124312 . – Nordøstsjaelland (NEZ) • Eriksholm Skov; 55°41.771′ N, 11°47.912′ E; PG77; 4 Nov. 2017; JP 734; JP det.; ZMUC C-F-123227 • Indelukket ved Frederiksborg Slot; 55°56.191′ N, 12°17.861′ E; UC30; 19 Mar. 2017; JP 682; JP det.; ZMUC C-F-123170 • Lyngen ved Ølstykke; 55°47.738′ N, 12°10.253′ E; UB28; 15 May 2013; JP 870; JP det.; ZMUC C-F-123366 • Mølleå ved Farum Lillevang; 55°49.093′ N, 12°18.496′ E; UB38; 24 Feb. 2018; JP 993; JP det.; ZMUC C-F-123500 • Stampeskov ved Rådvad; 55°48.332′ N, 12°33.138′ E; UB48; 14 Apr. 2013; JP 790; JP det.; ZMUC C-F-123285 . – Nordvestjylland (NWJ) • Vest for Vinderup; 56°28.727′ N, 8°44.810′ E; MH85; 19 Jan. 2015; JP 768; JP det.; ZMUC C-F-123262 . – Nordvestsjaelland (NWZ) • Bognaes Skov på Tuse Naes; 55°44.966′ N, 11°45.817′ E; PG78; 10 Dec. 2013; JP 887; JP det.; ZMUC C-F-123385 . – Sydsjaelland (SZ) • Denderup Sø i Denderup Vaenge; 55°15.075′ N, 11°57.366′ E; PG82; 9 Apr. 2019; JP 1426; JP det.; ZMUC C-F-123972 (2 slides) • Gammel Kalvehave; 54°59.745′ N, 12°8.232′ E; UA19; 25 Apr. 2019; JP 1453; JP det.; ZMUC C-F-124003 . – Vestjylland (WJ) • Velling; 56°3.078′ N, 8°18.596′ E; MH51; 16 Dec. 2018; JP 1269; JP det.; ZMUC C-F-123797 .

On Ptenidium intermedium Wankowiez, 1869 (Col. Ptiliidae)

DENMARK – Sydsjaelland (SZ) • Praestø; 55°6.913′ N, 12°2.035′ E; UB11; 25 Apr. 2019; JP 1431; JP det.; ZMUC C-F-123978 .

On Ptenidium pusillum (Gyllenhal, 1808) (Col. Ptiliidae)

DENMARK – Lolland, Falster, Møn (LFM) • Nyord; 55°2.885′ N, 12°12.380′ E; UB20; 27 Apr. 2013; JP 840; JP det.; ZMUC C-F-123335 .

Remarks

First record from Denmark. Sometimes coexists with S. flexa on the same host specimen. Although many immature thalli have been studied, we have not detected the presence of antheridia. A well-distinguished trichogyne stump may be seen on the outer side of the perithecium (Fig. 13B, arrow), which suggests the existence of antheridia. Rarely, some thalli bear a second mature perithecium (Fig. 13B). Thalli from host underside show inflated receptacular cells with constricted septa (Fig. 13B).