Rebentischia
Rebentischia P. Karst., Fungi Fenniae Exsiccati, Fasc. 9: no. 881 (1869).
Index Fungorum number: IF 4658; Facesoffungi number: FoF 00218, 10 morphological species (Species Fungorum 2022), no molecular data available.
Saprobic on decaying wood. Sexual morph: Ascomata superficial, solitary or scattered, globose-subglobose, black, coriaceous, ostiolate, sometimes collapsed when dry. Peridium thick, composed of cells of textura angularis, with dark brown to black cells. Pseudoparaphyses numerous, 1–2 μm wide, flexuous, hyaline, septate, branched. Asci 8-spored, bitunicate, fissitunicate, cylindric-clavate, short pedicellate, apically thickened. Ascospores biseriate, elongate-obovoid, trans-septate, brownish to dark brown, light at apex, base tapering to hyaline appendage. Asexual morph: Unknown (adapted from Boonmee et al. 2014).
Type species: Rebentischia pomiformis P. Karst.
Notes: The taxonomic position of Rebentischia has been controversial for several years and it was referred to different families (Saccardo 1877, 1883, Müller 1950, Arx & Müller 1975). Rebentischia is characterised by temperate saprobic lifestyle, darkly pigmented ascomata, bitunicate asci, and elongated, multiseptateascospores (Barr 1980). The latter also synonymized Rebentischia pomiformis with R. massalongi as formerly suggested by Arx and Müller (1975) and included it in Tubeufiaceae based on morphology. Barr (1980) pointed out that the asexual taxa such as asteromella-like fungi located near the ascomata of Rebentischia massalongi are possibly the asexual morph of Rebentischia. Boonmee et al. (2014) referred Rebentischia to Pleosporales based on morphology such as the darkened ascospores with a setiform basal appendage which is atypical of Pleosporales. Rebentischia is currently included in Pleosporales incertae sedis. More taxa are needed to resolve the correct taxonomic position of the genus.
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