Rhizocarpon dinothetes Hertel & Leuckert

Herzogia, 5: 27, 1979.
Distribution: C - Sar (Brackel & Berger 2019).
Description: Thallus crustose, areolate, greenish yellow, shiny, forming more or less orbicular, 3-8 mm wide patches on the thalli of Protoparmelia-species. Medulla white, I-. Apothecia lecideine, black, constricted at base, round, 0.4-0.7 mm across, mostly developing inbetween the areoles, with an initially flat, then strongly convex disc, and an initially thick and wavy, finally thinner proper margin. Exciple well-developed, with a 30-40 μm wide, purple-black rim, colourless within; epithecium brown-black, K+ purple; hymenium colourless, c. 130 μm high; paraphysoids strongly conglutinated, richly branched and anastomosing, sometimes slightly capitate; hypothecium brown-black. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform or submuriform, dark brown, usually with 3 transverse septa and 1-2 longitudinal septa (with 4-16 cells visible in optical view), 13.5-24.5 x 8.5-11.5 μm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: cortex with rhizocarpic acid.
Note: on siliceous rocks near and above treeline, starting the life-cycle on the thalli of Protoparmelia badia; probably present also in the Italian Alps, and to be looked for there.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Protoparmelia

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Einar Timdal http://nhm2.uio.no/lav/web/index.html - CC BY-NC

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC