Preliminary version 1 March 2013
Stirtonia obvallata (Stirt.) A. L. Sm.
Trans. Brit. Mycol. Soc. 11: 195 (1926).
Basionym: Data lacking.
Synonym: Index Fungorum
Type: India, Bengal, Chinsurah, on tree, s.d., Watt (BM - isolectotype).
Barcode:
Coordinates:
Thallus: crustose, spreading, covering an area of up to 10 cm diameter, contiguous, smooth, brownish to whitish, under 0.1 mm thick, mostly endophoeodal, lightly shiny, with calcium oxalate crystals, IKI+ blue. Ascigerous zones delimited, round to elongated and often branched and anastomosing in outline, ca. 0.2 - 0.3 mm wide, erumpent through the thallus and bark, higher than most of the surrounding thallus, white, pruinose, inconspicuously dotted when abraded, with calcium oxalate crystals, often with algal cells, IKI+ blue. Asci not visible in surface view, globose to ovoid, with 8 ascospores. Ascospores 7-13-septate, ellipsoid, 45-90 / 20 - 39 µm, cells generally equal, walls and septa >1 µm thick (Aptroot 2009: 621).
Photobiont: Green alga.
Chemistry: No lichen substances, but various terpenoids variably present which are originating from the bark (TLC). Thallus and ascigerous zones C-, Pd-, KOH-, UV- (Aptroot 2009: 621).
Ecology: On bark.
Molecular data: Genbank
Distribution: Database
Note: