In this paper, new species and formae of the genus Gloeandromyces (Ascomycota, Laboulbeniales) are described and illustrated. These are: Gloeandromyces dickii sp. nov. on Trichobius joblingi from Nicaragua and Panama; G. pageanus f. alarum f. nov. on Tri. joblingi from Panama; G. pageanus f. polymorphus f. nov. on Tri. dugesioides and Tri. joblingi from Panama and Trinidad; and G. streblae f. sigmomorphus f. nov. on Tri. joblingi from Panama. Gloeandromyces pageanus on Tri. dugesioides from Panama as described in Nova Hedwigia 105 (2017) is referred to as G. pageanus f. pageanus. Support for these descriptions of species and formae comes from phylogenetic reconstruction of the large subunit ribosomal DNA and from the application of species delimitation methods (ABGD, bPTP, GMYC). Host specialization results in phylogenetic segregation by host species in both G. pageanus and G. streblae and this may represent a case of incipient speciation. A second mechanism driving diversity involves position-induced morphological adaptations, leading to the peculiar morphotypes that are associated to growing on a particular position of the integument (G. pageanus f. alarum, G. streblae f. sigmomorphus).

Current affiliation Faculty of Science University of South Bohemia Branišovská 31 37005 České Budějovice Czech Republic

Department of Organismic and Evolutionary Biology and Farlow Reference Library and Herbarium of Cryptogamic Botany Harvard University 22 Divinity Avenue Cambridge MA 20138 USA

Herbario UCH Universidad Autónoma de Chiriquí Apartado Postal 0427 David Panama

Smithsonian Tropical Research Institute Apartado Postal 0843 03092 Balboa Panama

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