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 Genus Phaulomyces Thaxt. MB#3983 Memoirs of the American Academy of Arts and Sciences 16: 259 ( Thaxter 1931 ) . – Type species: P. corylophodis Thaxt. Adelomyces Thaxt., Memoirs of the American Academy of Arts and Sciences 16: 306 ( Thaxter 1931 ) [MB#79] Brief description Probably all species are monoecious. Lower receptacle two-celled. Antheridia sessile or subsessile, on the basal cell of the primary appendage ( Fig. 11E , an); proliferating into branches in older thalli. Remarks The genus consists of 14 species, of which eight in Europe, two in Denmark . The most recently described species are P. mediterraneus ( Santamaria & Rossi 1999 ) , and P. ptilii ( Majewski 1999 ) . In this genus we find some of the smallest species of Laboulbeniales , with thalli not reaching 50 µm of length, like P. perparvus Santam. ( Santamaria 1992a ) . Fig. 11. A–B . Euphoriomyces unilateralis T.Majewski. A . Paired thalli. B . Thallus with two perithecia, the lower immature, the upper overmature. – C . Phaulomyces euaestheti (Thaxt.) I.I.Tav. , mature thallus with two perithecia and with the probable cell III labelled (III?). – D–E . Phaulomyces octotemni (T.Majewski) I.I.Tav. D . Paired thalli. E . Five thalli with a labelled antheridium (an) on the right immature thallus. Scale bars: A–B = 20 µm; C–E = 50 µm. Photographs from slides ZMUC C-F-123798 (A–B), ZMUC C-F-122484 (C), ZMUC C-F-124330 (D), ZMUC C-F-124329 (E). Key to the Danish species 1. Third cell of the receptacle slightly flattened to isodiametric. Appendage ramified with rather long branches; up to 250 µm long. Perithecium bent towards the appendage. On Col. Ciidae ........................................................................................... P. octotemni (T.Majewski) I.I.Tav. – Third cell of the receptacle elongate, about twice longer than broad. Appendage unbranched; up to 180 µm long. Perithecium straight, or if bent, pointing towards the opposite direction of the appendage. On Col Staphylinidae Euaesthetinae ................................. P. euaestheti (Thaxt.) I.I.Tav.