Fissurina linoana Lücking, Moncada & G. Rodr.

Lücking, Robert, Moncada, Bibiana, Habibe, María Cristina Martínez-, Salgado- Negret, Beatriz E., Celis, Marcela, Zamora, Oscar Rojas-, Rodríguez- M., Gina M., Brokamp, Grischa & Borsch, Thomas, 2019, Lichen diversity in colombian caribbean dry forest remnants, Caldasia 41 (1), pp. 94-214 : 204-206

Fissurina linoana Lücking, Moncada & G. Rodr. sp. nov.

Mycobank MB 828114

( Fig. 3a ).

Diagnosis. Differing from Fissurina alligatorensis in the I-negative ascospores with thin walls and septa.

Type. COLOMBIA. Atlántico: Piojó, Reserva Forestal Protectora ( RFP) El Palomar ; 10º45’47” N, 75º08’56” W, 200–600 m; 18 March 2016, R . Lücking, B. Moncada et al. 42977b ( UNO, holotype) .

Description. Thallus corticolous, up to 2 cm diam., continuous, white-grey with a silvery shine, minutely uneven-verrucose; prothallus not observed. Thallus partially immersed in the periderm, in section 50–80 µm thick, ecorticate, dominated by the irregular photobiont layer, with large clusters of calcium oxalate crystals. Ascomata lirellate, more or less fissurine, unbranched to sparsely branched, immersederumpent, 0.5–1.5 mm long, 0.1–0.2 mm broad, 0.12–0.15 mm high; disc concealed; labia thin, entire, lighter than the thallus, along the slit with a thin, dark brown line, laterally covered by whitish thallus. Excipulum prosoplectenchymatous, 10–15 µm broad, yellowish, laterally covered by thallus including large clusters of crystals; periphysoids absent; hypothecium 10–15 µm high, light olive. Hymenium 90–100 µm high, clear; paraphyses unbranched, apically smooth. Asci 90–100 × 15–20 µm, oblong. Ascospores 8 per ascus, muriform, 15–20 × 9–12 µm, ellipsoid-oval, with thin septa and rectangular lumina, constricted at the median septum, hyaline, I–. Secondary chemistry: no sustances detected by TLC.

Etymology. This new species is dedicated to Lino Olivares, one of the most knowledgeable and passionate empirical experts of the flora of the Colombian Caribbean dry forests and collaborator in the EcoSecos initiative and other conservation efforts in the region for 18 years ( Castro-Vásquez et al. 2010, Rodríguez et al. 2012, Castellanos Castro and Newton 2015). ‐ Remarks. Currently, there are only two species known in Fissurina with a whitish, endoperidermal thallus, lacking substances, and muriform ascospores, namely F. alligatorensis Lendemer & R.C. Harris and F. ilicicola Lendemer & R.C. Harris ( Lendemer and Harris 2014) . The first agrees with the new species in thallus and ascoma morphology, as well as ascospore size, but has distoseptate, I+ strongly amyloid ascospores. The second one differs in the more distinct (hemithecioid) labia and the larger (24–32 × 12–14 µm), also distoseptate and I+ amyloid ascospores.

Figures

Figure 3. Species of lichens new to science. a. Fissurina linoana (42977b, holotype); b. Graphis lurizana (42922, holotype); c. Graphis mokanarum (42930, holotype); d. Phaeographis galeanoae (42981, holotype). Thalli with ascomata. Scale = 1 mm.