Pleosporales » Lophiostomataceae

Crassiclypeus

Crassiclypeus A. Hashim., K. Hiray. & Kaz. Tanaka, in Hashimoto et al., Stud. Mycol. 90: 167 (2018).

 Index Fungorum number: IF 823131; Facesoffungi number: FoF 08273, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on wood. Sexual morph: Ascomata scattered to gregarious, immersed, subglobose. Ostiolar neck elongated, laterally compressed, surrounded by a well-developed clypeus. Peridium composed of elongated, brown cells, surrounded by brown hyphae. Pseudoparaphyses numerous, septate, branched and anastomosed. Asci bitunicate, fissitunicate, clavate, 8-spored. Ascospores fusiform, hyaline, uniseptate, with a narrow bipolar sheath. Asexual morph: Conidiomata pycnidial, globose to subglobose, superficial to immersed. Peridium composed of subglobose to rectangular, brown cells. Conidiophores absent. Conidiogenous cells phialidic, ampulliform, hyaline, smooth. Conidia subglobose with rounded ends, hyaline, smooth, aseptate (adapted from Hashimoto et al. 2018).

Type species: Crassiclypeus aquaticus A. Hashim., K. Hiray. & Kaz. Tanaka

Notes: Crassiclypeus is characterised by scattered to gregarious immersed ascomata, elongated, laterally compressed ostiolar neck, fissitunicate, clavate, 8-spored asci and fusiform, hyaline, uniseptate ascospores surrounded with a bipolar sheath. The asexual morph is characterised by pycnidial, globose to subglobose conidiomata, ampulliform, hyaline, smooth conidiogenous cells and subglobose conidia with rounded ends. Crassiclypeus resembles Flabellascoma but can be differentiated based on the ascomatal wall and phialidic conidiogenous cells, the latter having a peridium with 1 zone and phialidic conidiogenous cells while the former has peridium with 2 zones and holoblastic conidiogenous cells (Hashimoto et al. 2018). Crassiclypeus also resembles Neotrematosphaeria but can be differentiated in that Neotrematosphaeria has a poorly developed peridium at the base and lacks a clypeated ostiolar neck (Thambugala et al. 2015, Hashimoto et al. 2018). Crassiclypeus has also been compared to Lentistoma in having similar clypeated ostiolar neck but the former differs in having a well-developed peridium while that of Lentistoma is less-developed (Hashimoto et al. 2018). Crassiclypeus is a distinct and well-supported genus in Lophiostomataceae. Molecular markers available for Crassiclypeus include ITS, LSU, BTUB and RPB2.

 

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