Dangeardiella Sacc. & P. Syd., Syll. fung. (Abellini) 14(2): 683 (1899).
Index Fungorum number: IF 1410; Facesoffungi number: FoF 06671, 5 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on stalks and petioles of ferns. Sexual morph: Ascomata black, clustered or loosely scattered, immersed to erumpent, subglobose or elliptical, uni-loculate or sometimes multiloculate with very reduced partition walls, forming indistinct slit-like ostiole. Peridium thin, comprising a few layers of dark brown cells arranged in a textura angularis. Hamathecium composed of hyaline, hyphae-like, numerous, aseptate pseudoparaphyses. Asci 8-spored, bitunicate, cylindrical, short pedicellate with rounded ends. Ascospores overlapping biseriate, hyaline, straight, narrowly fusoid with sharp to narrowly rounded ends, 5–10 septate, constricted at the primary septum. Asexual morph: Unknown (Adapted from Thambugala et al. 2014).
Type species: Dangeardiella macrospora (J. Schröt.) Sacc. & P. Syd.
Notes: Dangeardiella was introduced by Saccardo and Sydow (1899) with D. macrospora as type species. Dangeardiella is characterized by black, clustered or loosely scattered ascomata, cylindrical, short pedicellate with rounded ends asci and narrowly fusoid with sharp to narrowly rounded ends, 5–10 septate ascospores. Obrist (1959) added the new species Dangeardiella fusiformis to Dangeardiella. Barr (1987) accommodated Massarina in the Lophiostomataceae and suggested Lophiostomataceae, sensu stricto to accommodate Dangeardiella together with Massarina, Lophiostoma and four other morphologically similar genera (Liew et al. 2000; Hyde et al. 2013). Hawksworth et al. (1995) treated Dangeardiella in Dothideales, genera incertae sedis. Kirk et al. (2008) placed Dangeardiella in Melanommataceae. In the phylogenetic analysis of Liew et al. (2000) based on SSU gene, a strain of Dangeardiella formed a distinct lineage in Pleosporales together with Melanomma pulvis-pyrius, Herpotrichia diffusa and Pleomassaria siparia. Liew et al. (2000) did not place Dangeardiella in any family since Melanommataceae was not monophyletic as previously reported by Barr (1987, 1990) and Hawksworth et al. (1995). Lumbsch and Huhndorf (2010) treated Dangeardiella under Dothideomycetes, genera incertae sedis. Dangeardiella resembles members of Lophiostomataceae in having superficial to semi-immersed, carbonaceous, ascomata, with slit-like ostioles, cylindrical asci and narrowly fusiform ascospores. Thambugala et al. (2014) could not examine the type material of D. macrospora and provided an updated illustration of the genus based on a specimen collected by Lind in Petrak’s herbarium. Thambugala et al. (2014) tentatively placed Dangeardiella in Pleosporales, genera incertae sedis based on morphological similarities with Pleosporales and phylogenetic evidence based on SSU gene. Dangeardiella is currently in Pleosporales, genera incertae sedis and more taxa with DNA sequence data is needed to resolve and confirm the taxonomy of the genus.