Micarea deminuta Coppins

Bibl. Lichenol., 58: 58, 1995
Synonyms:
Distribution:
Description: Thallus crustose, usually poorly developed and hardly evident, effuse, whitish grey to green-grey. Apothecia micareoid, black, epruinose, sessile, 0.08-0.2(-0.25) mm across, convex to subglobose, without a distinct proper margin. Proper exciple not evident, even in young apothecia; epithecium patchily brown, K+ olivaceous green, N+ red; hymenium colourless or with dark brown, K+ olivaceous green streaks, 30-50 µm high; paraphyses scanty, of two types, a) unbranched, 1.5-2 µm thick, b) branched and sometimes anastomosing, 0.8-1 µm thick, not capitate but sometimes widening to 1.8 µm; hypothecium dark reddish brown, K- or K+ brown, N+ pale red, the upper part K+ olivaceous green, N+ red, 60-95 µm high. Asci 8-spored, clavate, the I+ blue tholus with a wide, I+ dark blue tube structure that expands towards the top, without a pale axial body. Ascospores 1-celled, hyaline, ellipsoid, (6-)7.5-10(-11.5) x (3.2-)3.5-4.5(-4.8) µm. Pycnidia partly immersed to sessile, c. 60 µm across, the wall brown and N+ pale red, olivaceous green and N+ red around the ostiole. Conidia simple, bacilliform, (4-)4.5-5 x 0.8-1 µm. Photobiont micareoid, the cells 5-7 μm wide. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.
Note: mostly on logs and rotting stumps; widespread in Europe, but not common, with a few records from the Eastern Alps (Carithia, Austria); to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model