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 Microsomyces Thaxt. MB#3190 Memoirs of the American Academy of Arts and Sciences 16: 184 ( Thaxter 1931 ) . – Type species: M. psammoechi Thaxt. Brief description Monoecious. Receptacle three-celled. Cell I continues in a branched rhizoidal haustorium that penetrates the host. Cell II becomes ± corticated by small cells, some of which giving rise to perithecia or secondary appendages bearing flask-shaped antheridia. Cell III supports a simple primary appendage ending in a solitary spinose flask-shaped antheridium. Perithecium outer wall with four cells for each vertical row. Remarks The genus consists of two species, of which one in Europe. Benjamin (1985) studied the morphology of the genus, especially of the second species, Microsomyces telephani , and emended the generic description. This work is a must to understand the complicate morphological structure of thalli in this unusual genus.