in Ertz, Tehler, Irestedt, Frisch, Thor & van den Boom, Fungal Diversity 70: 43 (2014).
Protolog: Gyronactis species characterised by the combination of the following characters: greyish green brown, verrucose thallus; whitish pruinose ascomata not contricted at the base; presence of numerous dark brown pycnidia producing curved, hyaline to pale brown conidia of 6-8 x 2-2.5 µm.
Protolog scan: Data lacking.
Protolog type data: Type: Myanmar, Upper Myanmar, Mandalay Division, Pyin Oo Lwin, National Kandawgyi Gardens, 3,538 ft, trunk in a garden, December 2005, Rammeloo s.n. (BR-holotype).
Type locality: Myanmar, Upper Myanmar, Mandalay Division, Pyin Oo Lwin, National Kandawgyi Gardens, trunk in a garden, 1160 m, December 2005, Rammeloo s.n. (BR-holotype).
Type locality coordinates: 22°2'4.38"N, 96°27'31.49"E; 22.03455°, 96.458747°.
Type locality photo: Data lacking.
Type scan: Data lacking.
Molecular barcode: Data lacking.
Thallus: epiphloeodal, ecorticate, thin, up to 200 µm thick, smooth at the margin, becoming verrucose in the central parts of the thallus, continuous or rarely with some narrow cracks, greyish green to greyish brown with a white margin, matt; hyphae 2-2.5 µm in diam. covered by tiny hyaline crystal dissolving in K (polarised light). Prothallus dark brown, 0.3-1 mm wide. Ascomata dispersed, single, rarely grouped by 2, circular in outline, not constricted at the base, with a flat to slightly convex, tomentose, pale brown hymenial disc covered by a thin white pruina, 0.6-1 mm in diam.; margin not well differentiated, pale brown, tomentose, not pruinose, usually level with the disc. Excipulum inconspicuous. Hypothecium pale brown (not carbonaceous), 60-110 µm thick, I+ orange-red, K-, K/I-. Hymenium hyaline, not interspersed with oil droplets, c. 80-110 µm thick; hymenial gel I+ orange-red, K/I+ pale blue or orange; epihymenium yellowish, I+ orange-red, K-, covered by a dense layer of crystals, part of them dissolving in K (polarised light). Paraphysoids sparingly branched, anastomosing, easily separated, 1-1.5 µm wide; apices not distinctly enlarged, pale brownish. Asci narrowly clavate, (6-)8-spored, 60-70 x 15-17 µm, with a K/I+ blue apical ring and K/I+ blue endoascus. Ascospores fusiform, 3(-4)-septate, ontogeny starting with a median septum, straight or slightly curved, not constricted at the septa, (16-)18.5-21.5(-24) x (4-)4.5-5.5(-6) µm (n=35); gelatinous sheath absent or not evident (at x 1,000); brownish pigmentation not observed. Pycnidia numerous, dispersed all over the thallus, in groups forming dark brown, matt, strongly convex patches of 0.2-1 mm in diam.; wall brown above, K+ darker, hyaline below; conidia curved, hyaline to pale brown, aseptate, 6-8 x 2-2.5 µm (Ertz et al. 2015: 43).
Photobiont: trentepholioid, cells 11-16 x 6-10 µm (Ertz et al. 2015: 43).
Chemistry: Chemistry: Thallus K-, C+ slightly reddish (fleeting), KC+ red (fleeting), P-, UV+ white. TLC (solvents EA, G): Gyrophoric acid (specimen tested: holotype) (Ertz et al. 2015: 43).
Ecology: On a tree.
Distribution type: Known only from the type collection.
Taxonomy: The sequences specimen is similar to Lecanactis elaeocarpa (Nyl.) Tehler by tomentose ascomata, 3-septate ascospores of similar size and the presence of lecanoric/gyrophoric acid, but that species has smaller (0.4-0.6 mm) and non-pruinose ascomata, a smooth thallus and lacks pycnidia (Egea and Torrente 1994). Moreover, Lecanactis elaeocarpa is only known from South America. Because of the similarity with our new species, L. elaeocarpa is combined in Gyronactis (Ertz et al. 2015: 43).
Note:
Consortium of North American Lichen Herbaria
Lichens of the Pacific Northwest
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