Xenomeris
Xenomeris Syd., in Sydow & Werdermann, Annls mycol. 22(1/2): 185 (1924).
Index Fungorum number: IF 5819; Facesoffungi number: FoF 12531, 11 morphological species (Species Fungorum 2022), no molecular data available.
Pathogenic on host. Hemi-biotrophic as small leaf spots 2 mm diam., dispersed, rarely confluent, amphigenous, flat, black, circular or irregular forming dark brown to black leaf spots. Sexual morph: Ascostromata solitary, scattered, or in groups, superficial to sometimes semi-immersed, dark brown to black. Peridium composed of an inner layer of brown cells of textura angularis and outer layer of textura globulosa. Hamathecium composed of dense, anastomosing, branching cellular pseudoparaphyses. Asci 8-spored, bitunicate, clavate to subcylindrical, with a short, narrow pedicel, thickened and rounded at apex, with an indistinct ocular chamber. Ascospores 2-seriateto partially overlapping, hyaline to pale olivaceous brown when immature, pale brown when mature, ellipsoidal or cylindrical to clavate, uniseptate, conspicuously constricted at the septum, smooth and thick-walled, the lower cell slightly attenuated and rounded towards the base, the upper cell with a rounded apex. Asexual morph: Sclerophoma sp. and Hormonema sp. (Sivanesan 1984).
Type species: Xenomeris pruni Syd.
Notes: Xenomeris is characterised by solitary, scattered, superficial to sometimes semi-immersed ascostromata, clavate to subcylindrical asci and 2-seriateto partially overlapping, hyaline to pale olivaceous brown ascospores. The asexual morph of Xenomeris reported is Sclerophoma sp. and Hormonema sp. (Sivanesan 1984). In the phylogenetic analysis of Winton et al. (2007) based on LSU, SSU and ITS, Xenomeris raetica and X. juniperi clustered in Capnodiales. Lumbsch and Huhndorf (2010), Kirk et al. (2013), and Wijayawardene et al. (2017, 2020) listed Xenomeris in Dothideomycetes genera incertae sedis. The generic type has not been sequenced. Fresh collections with DNA sequence data are needed to confirm the systematic position of Xenomeris.
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