Fellhanera borbonica Sérus., van den Boom & Brand  

Mycobank MB 517769

Thallus saxicolous, crustose, greyish green to pale grey, somewhat rimose and cracked (and then medulla seen at high magnification); prothallus indistinct. Photobiont chlorococcoid with cells green and globose, 5–8 µm diam. Apothecia rare, round, 0.5–0.7 mm in diam. and ca. 0.2 mm high, sessile and strongly constricted at the base, disc flat and eventually slightly convex, dark brown, with a violet hue (especially when fresh), margin thin but distinct, first slightly prominent and eventually flexuose and almost excluded, pale orange brown to brown; outer parts usually downy or with short whitish hairs, in young apothecia some connecting the apothecia to the thallus. Excipulum thin (c. 20–30 µm), inner parts typically paraplectenchymatous, becoming less typical towards the margin, and then made of densely interwoven hyphae with short hyphae protruding. Hypothecium 50–70 µm thick, dark brown to blackish, K–. Paraphyses strongly gelatinized, branched and not inflated at apices. Asci clavate, 50–60 x 10 µm, of the Byssoloma-type. Ascospores 8/ascus, ellipsoid, submurifom to muriform, 3(–4) transverse septa and (1–)2(–3) longitudinal or oblique ones, 18–20 x 5–7 µm, with a distinct halo (best seen in K). Pycnidia half-immersed in the thallus, ca. 0.1 mm in diam., wall pale orange, K–, C–, with a distinct gaping ostiole but no glut of conidia. Conidia numerous, typically biclavate (almost all conidia with both ends typically inflated and almost spherical), colourless, simple, 4–5 x 1.5–2 µm (width measured at extremities).