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 10.5852/ejt.2021.781.1583 2118-9773 5828924 Phaulomyces octotemni (T.Majewski) I.I.Tav. MB#105670 Fig. 11D–E Mycologia Memoirs 9: 273 ( Tavares 1985 ) . – Basionym : Euphoriomyces octotemni T.Majewski, Acta Mycologica 9(2): 232 ( Majewski 1973c ) [MB#313989]. – Type : “ On Octotemnus glabriculus Gyll. (Col., Cisidae ): Berezki , Ustrzyki Dolne county (Bieszczady Mts.), in small polypores on lying trunks of trees in a beech wood on the right bank of Wolosaty stream ( 650 m ), 12.9.1972 leg. T. Majewski ( TM. … 1040 – holotype )”; KRAM . [Host family is a Ciidae , not Cisidae ] Diagnostic features Third cell of the receptacle ± isodiametric, sometimes slightly flattened. One, more rarely two, perithecia for each thallus; bent towards the appendage.Appendage very elongate if undamaged, up to 250 µm long, 3–4 times as long as thalli. [Detailed description: Majewski 1994b ] Distribution and hosts Only known on the species type host from Poland ( type ) and Spain ( Santamaria 1995b ). Collections examined from Denmark On Octotemnus glabriculus (Gyllenhal, 1827) (Col. Ciidae ) DENMARK – Østjylland (EJ) • Almose i Fjeld Skov ; 56°24.698′ N , 10°27.948′ E ; NH95; 23 Nov. 2019 ; JP 1569 ; JP det.; ZMUC C-F-124329 , C-F-124330 . – Lolland, Falster, Møn (LFM) • Keldskov ; 54°39.977′ N , 11°33.286′ E ; PF66; 15 Oct. 2019 ; JP 1515 ; JP det.; ZMUC C-F-124270 . – Nordøstsjaelland (NEZ) • Hørsholm Arboret ; 55°52.017′ N , 12°30.373′ E ; UB49; 13 Nov. 2019 ; JP 1544 ; JP det.; ZMUC C-F-124304 , C-F-124305 . Remarks First record from Denmark . Although the host is common and widespread in Denmark , the fungus seems to be quite rare. Exactly as occurs with P. euaestheti there are problems with understanding where the primary septum is located. The successive formation of first and second perithecia if any, is driven likewise in both species. According to literature, antheridia are unknown in P. octotemni . Nevertheless at least in one of the studied immature thalli we suspect the presence of one flask-shaped antheridium on the first cell of the appendage ( Fig. 11E , an), similarly to described for P. euaestheti .