Micarea elachista (Körb.) Coppins & R. Sant.

Bull. Brit. Mus. Nat. Hist., Bot. ser., 11: 131, 1983. Basionym: Biatora elachista Körb. - Parerga Lichenol.: 159, 1860.
Synonyms: Bacidia sororians (Nyl.) H. Olivier; Biatorina glomerella (Nyl.) Arnold; Catillaria elachista (Körb.) Vain.; Catillaria glomerella (Nyl.) Th. Fr.; Lecidea poliococca Nyl.; Lecidea sororians Nyl.; Micarea glomerella (Nyl.) Hedl.
Description: Thallus crustose, episubstratic, of convex to subglobose, greenish white to whitish grey, usually epruinose, corticate areoles, more rarely coarsely granulose. Apothecia micareoid, 0.1-0.3 mm across, sometimes confluent into tuberculate, to 0.6(-0.8) µm wide aggregates, with a dark brown to brown-black, strongly convex to hemispherical disc, without a distinct proper margin. Proper exciple indistinct; epithecium pale to dark brown, the pigment dissolving in K, sometimes K+ faintly violet, 15(-20) μm highe; hymenium colourless or with brownish vertical streaks, 30-50 µm high; paraphyses numerous, richly branched and anastomosing especially in upper part, 0.8-1.5 µm thick at mid-level, the apical cells to 2 µm wide; hypothecium pale yellowish brown, K-, N-. Asci 8-spored, clavate to cylindrical-clavate, in K/I with a blue outer layer and apical dome and unstained wall, the dome with an apical cushion. Ascospores (0-)1(-3)-septate, hyaline, narrowly fusiform or ovoid-fusiform, sometimes slightly curved, (8-)10-18(-24) x 2-3.5 µm. Pycnidia frequent, immersed to emergent, grey-brown, often paler around the ostiole, the wall pale olivaceous brown, K+ violet, C+ violet. Mesoconidia cylindrical or ovoid and slightly wider at one end, 3.5-4.5 x 1.2-1.7 μm; microconidia narrowly cylindrical, 4-6.5 x 0.7-1 μm. Photobiont micareoid, the cells 4-7(-8) μm wide. Spot tests: K- or K+ faintly violet, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Montane belt: rare
Dry submediterranean belt: very rare
Humid submediterranean belt: very rare
Padanian area: absent

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Rarity

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Pier Luigi Nimis - CC BY-SA 4.0
TSB 23612


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23612)
2003/03/13


Pier Luigi Nimis - CC BY-SA 4.0
TSB 23612


P.L. Nimis CC BY-SA 4.0
TSB 23612


Pier Luigi Nimis - CC BY-SA 4.0
TSB 23612


Pier Luigi Nimis - CC BY-SA 4.0
TSB 23612


Pier Luigi Nimis - CC BY-SA 4.0
TSB 23612