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Syncesia depressa (Tuck.) Tehler
Family: Roccellaceae
Syncesia depressa image
Laurens Sparrius  
Thallus: crustose, tomentose, non-rimose surface: creamy to white, 0.01-0.06 mm thick, smooth, slightly pruinose, soredia absent; prothallus absent cortex: not developed medulla: indistinct Ascomata: stromatoid (pseudomonocarpocentric), very rarely apothecioid, in synascomata, up to 1.6 mm in diam.; individual discs: flat or slightly convex, 0.05-0.3 mm diam, usually ± tomentose; thalline exciple: level with the disc, without cortex and algae; proper exciple: present, thin; epithecium: light brown to brown, 20-30 µm thick; hymenium: hyaline, 70-80 µm high; paraphysoids: hyaline, sparsely branched, parallel, c. 1 µm in diam. asci: clavate, 60-70 x 10-15 µm, 8-spored ascospores: fusiform, hyaline, 3-septate, 41-48 x 4 µm Pycnidia: not seen Spot tests: thallus K+ yellow-reddish (K- if norstictic in very low concentration), C-, KC-, P+ orange; UV+ cream-colored Secondary metabolites: norstictic acid. Substrate and ecology: in bark, growing on trees and shrubs World distribution: known from a few localities in Curaçao, Colombia, Venezuela, and Florida, USA Sonoran distribution: one locality in Sinaloa, near Mazatlán.