Staurothele succedens  

Thallus superficial, grey-green to brown (often growing with a black film of cyanobacteria), not cracked, the surface roughened or with an almost micro-squamulose appearance, composed of lobed and branched goniocyst-like units 0.35-0.5 mm wide.
Anamorph: no information available.
Teleomorph: ascomata perithecia,  one quarter to half-immersed in the thallus, forming projections 300-500 µm diam., black, naked or with a few thallus granules, black, the surface sometimes roughened. Involucrellum present. Hymenial gel I+ red (I+ blue at very low concentrations of iodine), K/I+ blue. Hymenial algal cells 3-7.5 × 1.5-2.5 μm, 1.3-4.5 times as long as wide. Interascal tissue absent, periphyses and periphysoids present. Asci clavate, the wall thickened above, with an ocular chamber, after dehiscence with a delicate extruded endotunica, I–, K/I–, 8-spored. Ascospores (29.5-) 34-42.5 (-46) × (15-) 17-21.5 (-23) μm, (1.3-) 1.5-2.5 (-3.1) times as long as wide, ellipsoidal to cylindric-ellipsoidal or ovoid, irregularly muriform with up to 7 transverse septa and 2-3 longitudinal divisions, hyaline, smooth, thin-walled, without an epispore, gelatinous sheath or appendages.