Crassiperidium M. Matsum. & Kaz. Tanaka, in Matsumura, Kato, Hashimoto, Takahashi, Shirouzu & Tanaka, Mycosphere 9(6): 1259 (2018).
Index Fungorum number: IF 555726; Facesoffungi number: FoF 06671, 5 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on host. Sexual morph: Ascomata scattered, immersed, depressed globose to globose, ostiolate. Ascomatal wall composed of rectangular to polygonal, pale brown to brown cells. Hamathecium numerous, cellular, septate. Asci fissitunicate, cylindrical to clavate, pedicellate, 4–8-spored. Ascospores broadly fusiform, straight, thick-walled, with a submedian septate, 1–3-septate, hyaline, smooth-walled. Asexual morph: Conidiomata pycnidial, scattered, immersed, globose to subglobose, ostiolate. Conidiomatal wall composed of angular, pale brown to brown cells. Conidiophores absent. Conidiogenous cells annellidic, doliiform to ampulliform. Conidia cylindrical, truncate at the base, multi-septate, hyaline, smooth, without sheath (Adapted from Matsumura et al. 2018).
Type species: Crassiperidium octosporum M. Matsum. & Kaz. Tanaka
Notes: Crassiperidium was introduced by Matsumara et al. (2018) with C. octosporum as type species. Crassiperidium is characterized by scattered, immersed, depressed globose to globose, ostiolate ascomata, cylindrical to clavate asci and broadly fusiform, 1–3-septate, hyaline ascospores. The asexual morph is characterized by pycnidial, scattered conidiomata, annellidic, doliiform to ampulliform conidiogenous cells and cylindrical, multi-septate conidia lacking a sheath. Crassiperidium resembles Asteromassaria but can be differentiated based on the asexual morph in that the latter has acervular conidiomata and crescentic to falcate, multi-septate, brown conidia while Crassiperidium has pycnidial conidiomata, cylindrical, multi-septate, hyaline conidia (Sivanesan 1984; Wijayawardene et al. 2016). Crassiperidium is also similar to Pseudoasteromassaria but the latter belongs to Latoruaceae and can be differentiated from Crassiperidium in having pigmented ascospores and phialidic conidiogenesis (Ariyawansa et al. 2015). Crassiperidium is currently in Pleosporales genera incertae sedis. It seems that Crassiperidium should be accommodated in a new family as the two species C. ostosporum and C. quadrisporum forms a distinct and well-supported monophyletic lineage in Pleosporales. More taxa with DNA sequence data are required to confirm the taxonomic placement of the genus. Molecular markers available for Crassiperidium include SSU, LSU and RPB2.