First record of Harpellales, Orphellales (Kickxellomycotina) and Amoebidiales (Mesomycetozoea) from Bulgaria, including a new species of Glotzia Author Valle, Laia Guardia Unitat de Botanica, Dept. Biologia Animal, Biologia Vegetal i d'Ecologia. Fac. Biociences. Universitat Autonoma de Barcelona. 08193 - Bellaterra (Barcelona), Spain https://orcid.org/0000-0001-8295-1093 laia.guardia@uab.cat Author Stoianova, Desislava Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences. Sofia, Bulgaria https://orcid.org/0000-0001-8040-7158 text MycoKeys 2020 67 55 80 http://dx.doi.org/10.3897/mycokeys.67.52055 journal article http://dx.doi.org/10.3897/mycokeys.67.52055 1314-4049-67-55 CE9642BF68865BC2B7929C4F7076DCAE Graminella bulbosa Leger & Gauthier, 1937 ex Manier, 1962. Figs 11-13 Specimens examined. Site 2: slide BUL-2-5; Site 8: slides BUL-8-1, BUL-8-2. Notes. This species is characterised by the unusual formation of vegetative propagules from the bulbous basal cells (Fig. 12 ), a feature only shared with the related genus Gauthieromyces ( Lichtwardt 1983 ). Graminella bulbosa was described from France ( Leger and Gauthier 1937 ; Manier 1962). The species is also known from Spain ( Valle 2007 ), Portugal ( Valle 2013a ) and Italy ( Valle et al. 2013 ). Graminella bulbosa has been reported associated with various species of Baetis and related genera, very frequently within the hindgut of B. rhodani (Pictet). This species of mayfly is common and widespread in Europe and it also hosted Bulgarian specimens of G. bulbosa in the surveyed rivers, together with B. alpinus (Pictet). In fact, the genus Baetis bears different Harpellid species, including the more common Legeriomyces ramosus , occasionally sharing the same gut lumen with Graminella bulbosa . Bulgarian specimens of G. bulbosa show the typical small and numerous trichospores (Fig. 13 ), measuring 8 -11 x 2 µm in our collections. These measurements are midway between G. bulbosa and G. microsporus (see discussion for further information). Unfortunately, only immature zygospores were observed (Fig. 11 arrowhead).