Pleosporales » Lophiostomataceae


Crassiclypeus A. Hashim., K. Hiray. & Kaz. Tanaka

Index Fungorum number: IF 823131


Saprobic on submerged dead twigs of woody plant. Sexual morph: Ascomata scattered to gregarious, immersed, subglobose, dark brown to black, ostiolate. Ostiolar neck crest-like, elongate, laterally compressed, surrounded by a well-developed clypeus. Peridium uniform, composed of elongate, brown cells, surrounded by brown hyphae. Pseudoparaphyses numerous, trabeculate, filiform, hyaline, septate, branching and anastomosing. Asci 8-spored, bitunicate, fissitunicate, clavate, pedicellate, apically rounded with an ocular chamber. Ascospores fusiform, hyaline, septate, smooth, with an internal chamber and a narrow sheath which drawn out at both ends (Hashimoto et al. 2018). Asexual morph: Coelomycetous. Conidiomata pycnidial, superficial to immersed, scattered, or clustered in small groups, globose to subglobose. Peridium composed of subglobose to rectangular, brown cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells phialidic, ampliform, hyaline, smooth. Conidia subglobose with rounded ends, hyaline, aseptate, smooth (Hashimoto et al. 2018). (Description from Dong et al. 2020)


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


Notes: Crassiclypeus was introduced to accommodate the freshwater species C. aquaticus collecte

d in Japan (Hashimoto et al. 2018). The asexual morph has subglobose conidia formed in culture (Hashimoto et al. 2018). Crassiclypeus aquaticus clusters basal to Flabellascoma with moderate bootstrap support. Crassiclypeus aquaticus shares similar morphological characters with F. fusiforme in having fusiform, hyaline ascospores with a narrow, bipolar sheath. However, an internal chamber was not observed in the ascospores of F. fusiforme. (Notes from Dong et al. 2020)


List of freshwater Crassiclypeus species

Crassiclypeus aquaticus A. Hashim., K. Hiray. & Kaz. Tanaka, Studies in Mycology 90: 167 (2018)

Freshwater distribution: Japan (Hashimoto et al. 2018)



Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Hashimoto A, Hirayama K, Takahashi H, Matsumura M, Okada G, Chen CY, Huang JW, Kakishima M, Ono T, Tanaka K (2018) Resolving the Lophiostoma bipolare complex: generic delimitations within Lophiostomataceae. Stud Mycol 90:161–189


About Freshwater Fungi

The webpage Freshwater Fungi provides an up-to-date classification and account of all genera of freshwater fungi.


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