Merismatium is a genus of lichenicolous (lichen-dwelling) fungi of uncertain familial placement in the order Verrucariales. The genus was circumscribed in 1898 by Friedrich Wilhelm Zopf.
Species , Species Fungorum (in the Catalogue of Life) accepts six species of Merismatium. Host information is from Diederich et al. (2018). Merismatium coccotremicola – host: Coccotrema Merismatium corae – host: Cora Merismatium deminutum – hosts: Polyblastia, Staurothele, Thelidium, Verrucaria Merismatium nigritellum – hosts: Catapyrenium, Leptogium, Lichenomphalia, Lopadium, Micarea, Mycobilimbia, Ochrolechia, Protoblastenia Merismatium peregrinum – host: Rimularia Merismatium thamnoliicola – host: Thamnolia
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