Lecanora printzenii Pérez-Ortega, Vivas & Hafellner  

Mycobank MB 517790

Thallus composed of areoles, ± dispersed or aggregated, esorediate; areoles irregularly rounded, up to 0.3 mm in diam. and height, convex, surface yellowish green, dull. Photobiont Trebouxia-like, cells up to 20 µm in diam. Apothecia rounded, flexuose when mature, rarely single, often crowded; sessile, constricted at the base, especially when mature, (0.3–)0.5–1(–1.3) mm in diam.; disc greenish when young but soon becoming blackish, often pruinose when mature; margin prominent, persistent, matt and greenish when young but soon at least partly becoming melanized, black and shiny, with the exception of a narrow band, the closest part to the disc that remains greenish. Amphitecium corticated, up to 200 µm in the middle part, composed of a medulla of irregularly entangled hyphae and crowded algae; cortex composed of hyphae with thick walls, strongly gelatinized, with narrow lumina 0.5–1 µm; cortex 5–40 µm in the upper part, 20–70 µm in the middle part, 25–50 µm in the lower part, colourless within, outer part melanized. Hypothecium 20–40 µm high, hyaline; subhymenium 5–15 µm high; hymenium 50–65 µm; colourless; epihymenium ca. 10 µm, dark blackish green, K–; paraphyses weakly branched, anastomosed, 1–2 µm wide, expanded at the apex up to 5 µm, with a blackish green pigment surrounding the apices. Asci clavate, of Lecanora–type and with rostrate dehiscence, 35–40 × 9–14 µm (n = 10). Ascospores hyaline, simple, 7–11 x 4–6 µm (n = 40). Pycnidia not seen. Secondary chemistry: K–, C–, P+ yellow (amphitecium) or P–.