Rhizocarpon carpaticum Runemark

Opera Bot., 2: 133, 1956.
Synonyms:
Distribution: N - Frl (Tretiach & Hafellner 2000), Ven, TAA, Piem (Morisi & Sereno 1995, Morisi 2005). C - Tosc (Tretiach & al. 2008)
Description: Thallus crustose, episubstratic, rimose-areolate, pale yellow-green to whitish yellow, forming patches 1-6 cm in diam., delimited by a dark prothallus. Areoles contiguous, 0.2-0.8 mm wide, round to slightly angular, flat to usually slightly convex, smooth. Cortex without distinct structure, c. 40 µm thick; medulla white, I+ deep blue. Apothecia frequent, lecideine, arising between the areoles, round, 0.3-0,7 mm across, with a black, convex, epruinose disc, and a very thin, soon excluded proper margin. Proper exciple brownish red, K+ intensifying red; epithecium reddish brown, K- or K+ reddish violet; hymenium colourless, 70-90 µm high; paraphysoids strongly conglutinate, richly branched and anastomosing, clavate at apices; hypothecium brown, 100-200 µm high, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores 1-3-septate, rarely submuriform and with a single transverse septum, soon becoming dark green to brown, ellipsoid, 11-23 x 6-14 µm, halonate. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P- or P+ yellow. Chemistry: rhizocarpic and psoromic acids, sometimes with traces of gyrophoric acid.
Note: on siliceous rocks in underhangs protected from rain in cold sites with frequent fog, with optimum near or above treeline.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: 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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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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P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35088)
2003/03/17