Asymmetrispora Thambugala & K.D. Hyde, Fungal Divers. 74: 249 (2015).
MycoBank number: MB 551259; Index Fungorum number: IF 551259; Facesoffungi number: FoF 00833; 2 morphological species (Index Fungorum 2020), 2 species with molecular data.
Type species – Asymmetrispora tennesseensis (Mugambi, A.N. Mill. & Huhndorf) Thambugala & K.D. Hyde, Fungal Divers. 74: 248 (2015).
≡ Misturatosphaeria tennesseensis Mugambi, A.N. Mill. & Huhndorf, in Mugambi & Huhndorf, Stud. Mycol. 64: 114 (2009).
Notes – Asymmetrispora was introduced by Thambugala et al. (2015b) to accommodate A. tennesseensis (type species) and A. mariae based on asymmetrical ascospores. These species were previously known as Misturatosphaeria tennesseensis and M. mariae, respectively. Asymmetrispora species differ from Misturatosphaeria in having semi-immersed to erumpent, globose to pyriform ascomata, without a subiculum, and pale to dark brown, fusiform to broadly clavate, muriform, smooth-walled, ascospores lacking a mucilaginous sheath (Mugambi & Huhndorf 2009a, Zhang et al. 2013b). Jaklitsch et al. (2016b) illustrated a broad description on Floricolaceae and synonymized Asymmetrispora species under Teichospora and considered T. trabicola as type species. A. tennesseensis and T. trabicola (type species of Teichospora), show distinct morphological differences, such as A. tennesseensis has fusiform, 3-septate ascospores, hyaline when young, pale brown to dark brown at mature with constricted middle septum, whereas T. trabicola has brown and muriform, ellipsoid to clavate ascospores (Jaklitsch et al. 2016b). According to the muti-gene phylogeny herein, Asymmetrispora species are nested more distantly from Teichospora species (Fig. 152). Therefore, based on morphological and phylogenetic ambiguities of Asymmetrispora species with Teichospora species, we consider Asymmetrispora as an individual genus in Teichosporaceae.
Figure 152 – Phylogram generated from maximum likelihood analysis (RAxML) of genera in Teichosporaceae based on ITS, LSU, and tef1 sequence data. Maximum likelihood bootstrap values equal or above 70 %, Bayesian posterior probabilities equal or above 0.90 (MLBS/PP) are given at the nodes. An original isolate number is noted after the species name. The tree is rooted to Hermatomyces tectonae (MFLUCC 14-1140) and H. thailandica (MFLUCC 14-1143). The ex-type strains are indicated in bold. Hyphen (-) represents support values below 70 % MLBS and 0.90 PP.