Laboulbeniomycetes (Fungi, Ascomycota) of Denmark Author Santamaria, Sergi Unitat de Botànica, Departament de Biologia Animal, de Biologia Vegetal i d’Ecologia, Facultat de Biociències, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès (Barcelona), Spain. sergi.santamaria@uab.cat Author Pedersen, Jan Natural History Museum of Denmark (Zoological Museum), University of Copenhagen, Universitetsparken 15, 2100 København Ø, Denmark. japedersen@snm.ku.dk text European Journal of Taxonomy 2021 2021-11-26 781 1 425 http://dx.doi.org/10.5852/ejt.2021.781.1583 journal article 305924 10.5852/ejt.2021.781.1583 592281fb-ec34-447a-869b-e2722722534e 2118-9773 5828924 Siemaszkoa ramificans T.Majewski MB#363463 Fig. 13D–G Polish Botanical Studies 2: 224 ( Majewski 1991 ) . – Type : “ On Ptenidium turgidum Thomson. Bt. Bialowieza National Park , sect. 256, 18.6.1989 ( 4489 – holotype )”; KRAM . [ Poland ] Diagnostic features Receptacle consisting of (4–)5–6 superposed cells (cell I included). Appendage ramified into several branches above 2 nd –5 th cell; some of the branches bear narrowly elongated, flask-shaped antheridia ( Fig. 13E–F , arrows). Cells of the base of the appendage typically inflated ( Fig. 13D , *). Perithecium appears to be terminal on the receptacle axis. Perithecial apex asymmetric, with a protruding lip. [Detailed description: Majewski 1994b ] Fig. 13. Siemaszkoa spp. A –C . S. ptenidii (Scheloske) I.I.Tav. & T.Majewski. Mature thalli showing protruding lip in A (*), and a trichogyne stump in B (arrow). Thallus in B has developed two mature perithecia. – D–G . S. ramificans T.Majewski. D . Mature thallus showing cells of the base of the appendage typically inflated (*). E–F . Immature thalli showing antheridia (arrows). G . Mature thallus. Scale bars: A, D = 20 µm; B–C, E–G = 50 µm. Photographs from slides ZMUC C-F-123285 (A), ZMUC C-F-123972 (B), ZMUC C-F-123227 (C), ZMUC C-F-122719 (D), ZMUC C-F-122797 (E–F), ZMUC C-F-124322 (G). Distribution and hosts Only known from Poland ( type ) on species of the genus Ptenidium (Col. Ptiliidae ). Collections examined from Denmark On Ptenidium turgidum Thomson, 1855 (Col. Ptiliidae ) DENMARK – Nordøstjylland (NEJ) • Vesterskoven i Tofte Skov ; 56°50.346′ N , 10°13.361′ E ; NJ70; 7 Aug. 2013 ; JP 318 ; JP det.; ZMUC C-F-122797 . – Nordøstsjaelland (NEZ) • Stampeskov ved Rådvad ; 55°48.367′ N , 12°33.322′ E ; UB48; 23 Mar. 2017 ; JP 239 ; JP det.; ZMUC C-F-122719 . – Sydsjaelland (SZ) • Enemaerket ved Naesbyholm ; 55°22.429′ N , 11°36.776′ E ; PG63; 17 Nov. 2019 ; JP 1562 ; JP det.; ZMUC C-F-124322 . Remarks First record from Denmark and first since it was originally described. Unusual short thalli have been collected under the head of one host specimen, and we have decided to assign them to S. ramificans because of characters of the perithecial apex and the base of the appendage ( Fig. 13D ). A photo of this species is given here for the first time.