Alloarthopyrenia Phukhams., Lücking & K.D. Hyde, in Hyde et al., Fungal Diversity 80: 131 (2016)
Saprobic on tree branches in terrestrial, temperate forest habitats. Thallus and photobiont absent. Sexual morph: Ascomata solitary, erumpent, carbonaceous, apically ostiollate, periphysate. Involucrellum distinct, dark brown. Excipulum prosoplectenchymatous, brownish above, colorless below. Hamathecium comprising 0.5–1 µm wide paraphysoids, hyaline, straight, branched and anastomosing, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, clavate, short pedicellate, with a non-amyloid ocular chamber. Ascospores irregularly arranged to biseriate, fusiform ellipsoid to oblong, hyaline, uniseptate, euseptate, with secondary constrictions in each cell, rough-walled, constricted at the septum, with a gelatinous halo. Asexual morph: Unknown (adapted from Hyde et al. 2016).
Type species: Alloarthopyrenia italica Phukhams., Camporesi, Ariyawansa & K.D. Hyde
Notes: Alloarthopyrenia is unique in having a yellow thallus, clavate to cylindrical uni-seriate asci, and 3-septate ascospores. Alloarthopyrenia is morphologically and phylogenetically a distinct and well-defined genus in Trypetheliaceae. Molecular markers available for Alloarthopyrenia are ITS, LSU and SSU.