Coenogonium flammeum L. I. Ferraro, Michlig & Lücking  

Mycobank MB 517758

Thallus crustose, corticolous, continuous, thin, smooth, pale olive-grey, 2–5 cm diam., with cartilaginous corticiform layer, shiny; white prothallus present. Photobiont Trentepohlia, cells angular-rounded, in irregular plates or short threads, 6–10 µm diam. Apothecia sessile, rounded, 0.6–1.2 mm diam. and 150–200 µm high; disc at first plane but becoming slightly convex, deep orange-brown to red-brown; margin thin, not prominent, minutely denticulate (especially when young), creme-colored. Excipulum paraplectenchymatous with radiating cell rows in outer parts, 70–150 µm broad, colourless to pale orange peripherally, I+ sordid yellow-brown; outermost cells elongated and thin-walled. Hypothecium 15–25 µm high, colourless to pale yellowish. Hymenium 90–100 µm high, colourless, I+ (pale) blue then quickly sordid green, then reddish brown. Asci 70–80 × 5–6 µm. Ascospores uniseriate, ellipsoid, 1-septate, 8–11 × 2.5–3.5 µm, 3–3.5 times as long as broad. Pycnidia not observed. Chemistry: no substances detected by TLC.