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 Chitonomyces paradoxus (Peyr.) Thaxt. MB#170184 Fig. 21E Memoirs of the American Academy of Arts and Sciences 12: 287 ( Thaxter 1896: 287 ) . – Basionym : Heimatomyces paradoxus Peyr., Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. Wien . Mathematisch-naturwissenschaftliche Classe. Abteilung 1 68: 251 ( Peyritsch 1873 ) [MB#249906] . – Type : [Not designated] [Ind. loc.] [Type lost?!] “Mit der vorhergehenden Art auf Laccophilus minutus Sturm und L. hyalinus Degeer ”. [ Austria ] Heimatomyces unciger Thaxt. ( Thaxter 1895: 478 , as uncigerus ) [MB#245659]. – Chitonomyces unciger (Thaxt.) Thaxt. ( Thaxter 1896: 288 , as uncigerus ) [MB#175610] Chitonomyces truncatus Speg. ( Spegazzini 1915b: 47 ) [MB#176303] Diagnostic features The ascogenous cavity inside the perithecium appears nearly horizontal, strongly curved, u-shaped. The ostiole is surrounded by obtuse, usually prominent and asymmetrical lips ( Fig. 21E , *). The perithecium bears a variably elongated horn-like outgrowth arising from the upper outer wall cell of the anterior row. [Detailed descriptions: Thaxter 1916 , 1924 ; Sugiyama 1973 ; Majewski 1994b ; Santamaria 2001b , 2003 ; De Kesel & Werbrouck 2008 ; Goldmann & Weir 2012 ] Distribution and hosts More common than Ch. melanurus with which it often coexists on the same host individual, occupying a similar position but just below it. Reported on Laccophilus (Col. Dytiscidae ) in America : Grenada , Jamaica , USA , Trinidad & Tobago ( Santamaria et al. 1991 ), Bahamas ( Haelewaters et al. 2017 ); Asia : Indonesia , Japan , Taiwan , Thailand ( Santamaria et al. 1991 ), Korea ( Lee & Kim 1990 ), China ( Lee et al. 1995 ), Turkey ( Rossi 2016 ), Cambodia ( Try et al. 2017 ); Africa : Sierra Leone ( Rossi & Leonardi 2018 ); and Europe : Austria ( type ), Finland , France , Germany , Hungary , Italy , Poland , Russia , Spain , United Kingdom , former Yugoslavia ( Santamaria et al. 1991 ), Belgium ( De Kesel & Werbrouck 2008 ), Sweden ( Huggert 2010 ). Collections examined from Denmark On Laccophilus minutus (Linnaeus, 1758) (Col. Dytiscidae ) DENMARK – Bornholm (B) • Raghammer Odde ; 55°1.193′ N , 14°55.777′ E ; VA99; 22 Jun. 2018 ; JP 1146 ; JP det.; ZMUC C-F-123668 . – Nordvestsjaelland (NWZ) • Klintebjerg ved Klint ; 55°57.321′ N , 11°34.197′ E ; PH60; 16 Oct. 2017 ; JP 589 ; JP det.; ZMUC C-F-123078 . – Vestjylland (WJ) • Simmelmose ; 55°46.299′ N , 9°3.519′ E ; NG08; 2 Jun. 2019 ; JP 1478 ; JP det.; ZMUC C-F-124063 . Remarks First record from Denmark . Three forms of this species may be perfectly distinguished by morphological traits, depending on the hosts, being Laccophilus minutus , L. poecilus (= L. variegatus ) and L. hyalinus . These forms were described and illustrated by Majewski (1994b) and Santamaria (2001b , 2003 ). Further studies supported by molecular analysis might clarify the taxonomic position of these forms. Danish thalli belong to the form growing on L. minutus .