Scytinium aquale (Arnold) Otálora, P.M. Jørg. & Wedin
Fungal Diversity, 64, 1: 290, 2013. Basionym: Leptogium pusillum var. aquale Arnold - Verh. K.-K. zool.-bot. Ges. Wien, 23: 489, 1873
Synonyms: Leptogium aquale (Arnold) P.M. Jørg.
Distribution:
Description: Thallus crustose, subgelatinous when wet, black to dark brown, continuous and film-like to partly granular, up to 70 µm thick, paraplectenchymatous throughout. Apothecia common, up to 0.5 mm across, subglobose and constricted at base, with a concave, brown disc, a prominent, sometimes crenulate proper margin, and a crenulate, finally sometimes excluded thalline margin. Thalline exciple 45-50 µm wide, thinner and receding in upper part; proper exciple 35-40 µm wide, subparaplectenchymatous, pale reddish brown in upper part, otherwise colourless; epithecium pale reddish brown; hymenium colourless, c. 200 µm high, I+ blue; paraphyses coherent, mostly simple, the apical cells slightly swollen; hypothecium colourless. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores submuriform to muriform, hyaline, broadly ellipsoid, (25-)30-45(-50) x 10-14 µm. Pycnidia rare, more or less immersed, c. 0.1 mm across. Conidia dumb-bell shaped, 3.5-4 x 1.2-1.5 µm. Photobiont cyanobacterial (Nostoc, the cells in chains). Spot tests: all negative. Chemistry: without lichen substances. Note: an arctic-alpine species growing on calciferous rocks in the inundation zone of lakes and streams; reported from the Alps (Switzerland) to be looked for in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)
Predictive model
Source: Westberg, M., Arup, U., Berglund, T., Ekman, S., Nordin, A., Prieto, M. & Svensson, M. 2016. New and interesting records of lichens from Pältsan (Mt Bealccan) in northernmost Sweden. Graphis Scripta 28(1–2): 22–32. Tartu. ISSN 0901-7593.
Pältsan, on N-facing slope c. 1.7 km NW of the middle peak (1444 m), alt. 1110 m,
69.01946°N, 20.19632°E. 6 Aug. 2011, Westberg P123 (S F273321)
Growth form: Crustose
Substrata: rocks
Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)
Predictive model
