Micarea lignaria var. endoleuca (Leight.) Coppins

Bull. Brit. Mus. Nat. Hist., Bot. ser., 11: 146, 1983. Basionym: Lecidea milliaria var. endoleuca Leight. - Lich. Fl. Gr. Brit., 3rd ed.: 363, 1879.
Synonyms:
Distribution: N - TAA (Nascimbene & al. 2007b).
Description: Thallus crustose, endosubstratic or composed of dull yellowish white, usually convex-granulose, 0.1-0.3 mm wide areoles. Apothecia micareoid, black or blue-black, sessile to substipitate, often tuberculate, 0.15-0.6(-0.9) mm across, with a convex to almost globose disc, without a proper margin. Proper exciple poorly developed and soon excluded, brownish in outer part; epithecium scarcely differentiated from the hymenium; hymenium 50-75 μm tall, colourless, or olivaceous to blue-green in upper and sometimes lower parts, the pigmented parts K-, N+ red, rarely with a few scattered, minute violaceous granules reacting K+ green; paraphyses numerous, 1.5-2 μm thick at mid-level, simple or sparingly branched in upper part, the apical cells often slightly swollen; hypothecium pale blue-green or olivaceous, K-, the central part often colourless or pale brown. 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 (3-)4-7-septate, hyaline, fusiform to narrowly fusiform, straight or slightly curved, rounded at one end and acute at the other, 16-36(-38) x 4-6(-7) μm. Pycnidia more or less immersed, the wall green (K-) in upper parts. Conidia curved, 3-7-septate, 16-22 x c. 1 μm. Photobiont micareoid, the cells 4-7 μm wide. Spot tests: thallus K-, C+ yellow-orange, KC+ orange, P-; apothecial sections C-. Chemistry: unidentified xanthones.
Note: although sometimes sympatric with the typical variety, this taxon is restricted to very humid areas at lower altitudes. Surprisingly, the only Italian record is from a rather dry-continental region (see Nimis 1993: 435). This variety is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Restricted to humid-warm, oceanic areas

Commonnes-rarity: (info)

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

pH of the substrata:

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Altitudinal distribution:

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Predictive model

Source: http://fungi.myspecies.info/gallery/endoleuca - Licence: CC BY-NC 3. Photo uploaded by Paul Cannon