ITALIC 8.0

Micarea eximia Hedl.

Bih. K. svenska Vetensk-Akad. Handl., 3, 18, 3: 84, 1892.

Synonyms: Catillaria malmeana Zahlbr.

Distribution:

Description: Thallus crustose, endosubstratic, consisting of minute clusters of photobiont cells with intertwining hyphae that often have green walls reacting K-, N+ red. Apothecia micareoid, emarginate, usually numerous, convex-globose from the start, often becoming tuberculate, black, matt or slightly glossy, 0.1-0.2 mm across (to 0.4 mm when tuberculate). Proper exciple indistinct, sometimes appearing as a dark green or brownish reflexed zone with branched, radiating, pigmented, c. 1.5-2 µm thick hyphae; epithecium bright to dark aeruginose green, K-, N+ purple-red; hymenium green in upper part, more or less colourless in lower part, with aeruginose-green vertical streaks, 30-45 µm high; paraphyses rather scanty, branched and anastomosing, 0.7-0.8 µm thick in lower part, 2-3 µm thick and with pigmented walls in upper part, a few of them with pigmented walls throughout their length; hypothecium 45-120 µm high, dilute reddish- or purplish brown, sometimes with darker blotches, K+ dull green, N+ purple-red, the pigment confined to the gel-matrix Asci 8-spored, clavate, in K/I with a blue outer layer and apical dome and unstained wall, the dome with an apical cushion, c. 30-40 x 11-12 µm. Ascospores (0-)1-septate, hyaline, oblong-fusiform, sometimes slightly curved, 9-14(-16) x 1.8-2.5 µm. Pycnidia numerous but inconspicuous, usually immersed, black, c. 35-80 µm in diam, the walls dark green, K-, N+ purple-red. Mesoconidia cylindrical, sometimes biguttulate, 3.9-5.5 x 1-1.4 µm. Photobiont micareoid, the cells 4-7 µm wide. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: withouit lichen substances.

Note: a rare or overlooked species of conifer lignum, known from a few localities in Northern, Western and Central Europe, with a single record from the Alps (Switzerland). To be looked for in the Italian Alps.

Growth form: Crustose

Substrata: lignum

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Detail from: https://gzu.jacq.org/GZU000286373

GZU000286373 - Collector Hedlund,J.T. s.n. Date 1891-08 Location Sweden / Jämtlands Län Label Nosbovale par. Ofranåken Helsinglandis SYNTYPE