Lempholemma corticola M. Schultz & T. Sprib.  

Mycobank MB 517794

Thallus corticolous, blackish olivaceous, ecorticate or thallus granules and apothecia pseudocorticate, gelatinous when wet, granulose to irregularly areolate, granules ca. 65–165 µm wide, effuse to later aggregated forming irregularly shaped areoles, 0.6–2.5 mm wide giving the thallus a very uneven appearance, fixed to the substrate by pale rhizohyphae. Isidia and soralia lacking. Apothecia small, 0.25–0.37 mm, subglobose, adnate with slightly constricted base to stipitate, disc at first punctiform, eventually opened, pale brownish, plane, thalline margin thin, 25–30 µm thick, soon receding. Excipulum proprium thin but distinct, composed of few interwoven hyphae, pale, basally 5 µm thick, laterally ca. 10 µm thick, apically widened and seen from above as pale ring. Hymenium clear, 110–120 µm high, KOH/IKI+ blue, paraphyses distinct, sparsely branched, apically widened. Asci broad cylindrical to obclavate, 75–80 x 12–15 µm, wall thin, not amyloid, tip not thickened. Ascospores 8/ascus, simple, ellipsoid to broad ellipsoid, hyaline, (10.5–)13–19(–20.5) x (6–)6.5–8(–9) µm. Pycnidia and pycnoconidia not seen. Ascomata developing from tangle of generative hyphae. Photobiont Nostoc in bead-like chains. Secondary chemistry: nil.