Lecidella greenii U. Ruprecht & Türk  

Mycobank MB 517793

Thallus crustose, whitish, grey, beige, well-developed, rimose to areolated and sometimes granulose; chasmolthitic and epilithic, up to 1 mm high and 5 cm in diam. Pycnidia infrequent, up to 0.2 mm; photobiont Trebouxia sp. Apothecia in dense groups; visible margin when young, inconspicuous when old and large; black, matt disk, flat to convex, up to 1.2 mm in diameter, sessile, constricted at the base. Epihymenium up to 10 µm, olive to dark green; hymenium 80–90 µm, hyaline to light brownish when mature, inspersed; Paraphyses simple, 1–2 µm in diam., rarely anastomosing, flexuous, slightly adglutinated, end cell dark green to olive and slightly thickened to 4 x 4 µm; subhymenium up to 40 µm, hyaline to light green; hypothecium hyaline, inspersed with brown crystals; excipulum to 200 µm broad, I–, hyaline, dark green margin, of radiate hyphae; asci of the Lecidella-type, 40–50 µm long; ascospores 8/ascus, non-septate, hyaline, 10–11(–12) x 6–7(–8) µm, broadly ellipsoid, length-width index 1.5–1.6. Secondary chemistry: chemotype I: nil, chemotype II: stictic acid chemosyndrome; spot tests: K– or K+ yellow, I–, C–.