Perithecia: immersed in the host thallus, subglobose, 100200 µm wide, scattered or slightly aggregated, not producing neither distinct galls, nor deformations or necrotic patches in the host thallus; wall: dark brown in the upper part of ascomata, paler in the lower part; centrum: I-, K/I-; hamathecium: interascal filaments abundant, branched, anastomosing, 1-2 µm thick; asci: ±: clavate, 65-90 x 14-22 µm, with distichously arranged ascospores, (6-)8-spored; ascospores: dark brown, 1-septate, ellipsoid, with both cells ±equal in shape, or lower cell sometimes slightly narrower, usually not constricted at the septum, coarsely verruculose, commonly with a distinct gelatinous sheath, 17-25 x 6-11 µm.; Host: thallus of Dimelaena oreina; World distribution: Spain and Mexico; Sonoran distribution: Chihuahua.; Notes: The relatively large, coarsely ornamented ascospores with a distinct gelatinous sheath c. 2 µm wide are distinctive of this species. Dimelaena oreina hosts a further species with perithecioid ascomata, 8-spored asci and brown ascospores: Endococcus oreinae Hafellner. Its ascospores are brown to pale brown, smaller, 16-20 x 5-7 µm, not ornamented and without a gelatinous sheath, and, like all species of Endococcus, the ascomata show persistent periphysoids and lack interascal filaments.
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