Muellerites
Muellerites L. Holm, Svensk bot. Tidskr. 62: 231 (1968).
Index Fungorum number: IF 3285; Facesoffungi number: FoF 07665, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on needle-like leaves of cypress. Sexual morph: Ascomata forming at the base of the leaves, solitary to gregarious, superficial, coriaceous, globose, black, with indistinct ostiole, easily removed. Peridium comprising a single layer composed of thick-walled, brown cells of textura angularis. Hamathecium of ca. 1 µm wide dense, septate, branch pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical, with a short pedicel, apically rounded with an ocular chamber. Ascospores 2-seriate, ellipsoid to fusiform, dark brown, 3–4-septate, straight to curved, rounded or with acute ends, smooth-walled, surrounded by a mucilaginous sheath. Asexual morph: Unknown (adapted from Dai et al. 2014).
Type species: Muellerites juniperi (E. Müll. & Arx) L. Holm
Notes: Muellerites is characterised by solitary to gregarious, superficial, coriaceous, globose ascomata, cylindrical asci, 2-seriate, ellipsoid to fusiform dark brown, 3–4-septate ascospores. Dai et al. (2014) re-examined the holotype specimen of M. juniperi and placed Muellerites in the family Dothidotthiaceae based on morphology. Muellerites differs from Dothidotthia in having solitary, gregarious ascomata with indistinct ostioles, and fusiform, 3–4-septate, dark brown ascospores while Dothidotthia has raised to erumpent ascomata with a central ostiole, pale brown to medium brown. transversely uniseptate ascospores (Senwanna et al. 2019). Crous (2018) placed Muellerites in Neocelosporiaceae based on phylogenetic analyses. Muellerites is a distinct genus in Neocelosporiaceae but more taxa with sequence data are needed to verify the taxonomic status of the genus.
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