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Graphis lurizana Lücking, Moncada & Celis sp. nov. Mycobank MB 828115 (Fig. 3b). Diagnosis. Differing from Graphis illinata in the apically exposed, black labia and the smaller ascospores. Type. COLOMBIA. Atlántico: Usiacurí, Distrito Regional de Manejo Integrado (DMI) Luriza; 10º44’22” N, 75º01’24” W, 100–200 m; 1 December 2015; R. Lücking, B. Moncada et al. 42922 (UNO, holotype; B, isotype). Description. Thallus corticolous, epiperidermal, up to 7 cm diam., continuous, white-grey, uneven, opaque; prothallus not observed. Thallus in section 100–150 µm thick, with thin, prosoplectenchymatous cortex and irregular photobiont layer, strongly encrusted with large clusters of calcium oxalate crystals. Ascomata lirellate, unbranched to sparsely branched, prominent, 1–3 mm long, 0.4–0.5 mm broad, 0.2–0.3 mm high; disc concealed; labia entire, apically exposed, black, with irregular, lateral thalline margin. Excipulum completely carbonized (thin at the base), 70–100 µm broad; hypothecium 20–30 µm high, hyaline. Hymenium 130–160 µm high, clear; paraphyses unbranched, apically smooth. Asci 120–130 × 25– 25 µm, oblong. Ascospores 1 per ascus, richly muriform, 80–110 × 25–30 µm, oblong, with slightly thickened septa and more or less rounded lumina, hyaline, I+ violet-blue. Secondary chemistry: no substances detected by TLC. Etymology. Graphis lurizana is dedicated to the Luriza community, who manages the Distrito Regional de Manejo Integrado (DMI) Luriza, the first protected area to be declared in the Atlántico Department (Molina-Acosta 2013). Remarks. Graphislurizana keysoutingroup 9 in the Graphis world key of Lücking et al. (2009a). There are four species in this group with large ascospores (> 80 µm), lacking secondary substances, and with elongate, prominent lirellae, namely G. acharii Fée, G. cleistomma Nyl., G. illinata Eschw., and G. subvernicosa Lücking. Graphis acharii and G. subvernicosa have (2–)4–6(–8) ascospores per ascus; in addition, in G. acharii the labia rather regularly become striate and the ... |