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 Add this item to the list   811192 Original description
Remarks (public):This new species somewhat resembles Ocellularia crocea (Kremp.) Overeem & D. Overeem in the ascomata with fissured and layered margin, but the chemistry is different, with O. crocea having an orange pigment in the medulla of the ascomata. Also, the thallus in that species contains the cinchonarum unknown and the ascospores are smaller. A pale yellow pigment is known from O. fecunda (Vain.) Hale, O. polydiscus Redinger, and O. rubropolydiscus M. Cáceres, Aptroot & Lücking (Cáceres et al. 2014), all also having medium-sized to large, transversely septate ascospores. However, O. fecunda has ascomata with entire margin and narrow pore and contains hypoprotocetraric acid, whereas O. polydiscus differs in the radially divided, grey disc and cinchonarum unknown chemistry. Both also lack a second pigment. Ocellularia rubropolydiscus does have an additional red pigment in the ascomata but the pigment reacts K+ purple and that species also contains the cinchonarum unknown. The new taxon was originally identified as O. xanthostroma (Nyl.) Zahlbr., but that species has ascomata with narrow pore and entire margin and an orange medulla, larger ascospores and, except for the pigment, lacks secondary substances. 
Description type:Original description 
Description:Thallus corticolous, epiperidermal, up to c. 5 cm diam., continuous; surface verrucose, olive-green; prothallus absent. Thallus in section 100–150 µm thick, with dense, paraplectenchymatous cortex, 10–20 µm thick, photobiont layer 20–40 µm thick, and medulla, 70–100 µm thick, strongly encrusted with large clusters of calcium oxalate crystals and also with numerous small, grey crystals, in surface view white. Photobiont Trentepohlia; cells rounded to irregular in outline, in irregular groups, dark olive-green, 8–11  6–10 µm. Ascomata rounded to somewhat irregular in outline, prominent to sessile, with nearly complete thalline margin, 1–1.5 mm diam., 0.3–0.4 mm high; disc covered by 0.1–0.2 mm wide pore; proper margin indistinct, becoming fissured, visible as thin, black teeth around the pore; thalline margin thick, irregularly fissured to lobulate and appearing layered in large ascomata, exposing a pale yellow, K+ orange medulla thinly mottled with a second, dark red, K+ green pigment, corticate portions olive-green. Excipulum brown below, apically or in upper half carbonized, 50–100 µm wide, laterally covered by brown, amorphous periderm and algiferous, corticate thallus containing large clusters of calcium oxalate crystals; columella present, carbonized, triangular to finger-like or becoming somewhat irregular, up to 150 µm broad; hypothecium prosoplectenchymatous, 10–15 µm high, hyaline to pale yellowish; hymenium 130–150 µm high, hyaline, clear; epithecium indistinct, 10–15 µm high, hyaline. Paraphyses unbranched, apically smooth; periphysoids absent; asci oblong to fusiform, 130–140  20–25 µm. Ascospores 8 per ascus, irregularly arranged, oblong, 9–11-septate, 50–60  9–11 µm, 5–6 times as long as wide, hyaline, distoseptate with lens-shaped lumina, I+ violet-blue. 
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