Micarea hedlundii Coppins

Bull. Brit. Mus. Nat. Hist., Bot. ser., 11: 135, 1983.
Synonyms:
Distribution: N - Ven (Nascimbene & al. 2013b), TAA (Thor & Nascimbene 2007).
Description: Thallus crustose, episubstratic, effuse, olive-green, minutely granular, composed of 20-40 µm wide goniocysts containing orange granules reacting K+ and C+ violet. Apothecia very rare, micareoid, 0.2-0.5 mm across, often tuberculate, pale brown to grey-brown, with a strongly convex disc, without a proper margin. Proper exciple indistinct; epithecium yellowish brown, K+ violet; hymenium colourless, often with irregular, brownish vertical streaks reacting K+ violet; hypothecium colourless to yellowish. Asci 8-spored, cylindrical-clavate, the I+ blue tholus with a wide, I+ dark blue tube structure that expands towards the top, without a pale axial body. Ascospores 0(-1)-septate, hyaline, ellipsoid, ovoid or oblong, 6.5-12 x 2.5-4 μm. Pycnidia stalked, cylindrical, usually unbranched, 0.2-0.5(-1) mm tall, the stalk pink-brown or grey-brown, but covered in a whitish tomentum, the wall K+ and C+ violet. Mesoconidia narrowly ellipsoid, 4-6 x 1.2-1.7 μm. Photobiont micareoid, thin-walled, the cells 4-7 μm wide. Spot tests: thallus K- or K-+ faintly violet, C- or C+ faintly violet, P- (reactions best visible under the microscope).
Note: a rather rare species growing on wood (mostly on the vertical surfaces of stumps) and rotting roots of conifers in montane to subalpine forests, ranging from the Alps to northern Europe. It is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples

Andres Saag - CC BY-SA NC - Source: http://esamba.bo.bg.ut.ee/checklist/est-img/browserecord.php?-action=browse&-recid=2155