Micarea doliiformis (Coppins & P. James) Coppins & Sérus.
Lecidea doliiformis Coppins & P. James
Thallus granulose, thin at first but may become relatively thick and more or less continuous or cracked with age, greenish-gray, whitish-gray or both mixed. Apothecia more or less abundant and sometimes absent, sessile, 0.2-0.5 mm in diameter, disc convex to subglobose, pale pinkish brown under a thin whitish pruine, becoming darker in old age, concolorous exiple, thin, in general barely visible or absent in adult apothecia. Pale brown epithecium containing crystals soluble in K. 8-spore asci, long claved, 40-45 x 8-10 µm. Simple, colorless, ovoid to broadly elliptical spores, 7-11 x 3-4 µm according to the literature, 8-10 x 3-4 µm according to our measurements. Branched paraphyses. Usual presence of pycnidia with an opening at the top sometimes conspicuous and gaping, sessile, barrel-shaped or with a short stipe, 0.1-0.2 mm wide and 0.2-0.3 mm high, greyish dark gray-brown, sometimes with a whitish tomentum so fresh; giving pycnospores of 3.5-5 x 1.5-2 µm according to the literature, 4-5 x 1.5-2 µm according to our measurements. Photobiont: trebouxioid 4-8 µm in diameter. C-, K-, KC-, P-. Species occurring on acidic bark at the base of tree trunks in open, airy oceanic forests. NB Species given as rare in the literature but this rarity is probably due to the fact that it is an unspectacular species which must be searched systematically, it is also due to the fact that sterile thalli without apothecia are frequent and only recognizable by their pycnidia which requires the use of a strong magnifying glass in the field.