Rhizocarpon lusitanicum (Nyl.) Arnold

Flora, 53: 478, 1871. Basionym: Lecidea lusitanica Nyl. - Flora, 47: 605, 1865.
Synonyms:
Distribution: C - Sar.
Description: Thallus crustose, areolate, parasitic in the thalli of Lepra-species, forming 1-3 mm wide, dull yellowish green patches on the thallus of the host (grey-white when young and edokapylic), the areoles flat, 0.2-0.3 mm across. Medulla white, I- or I+ very faintly blue. Apothecia lecideine, black, developing between the areoles, 0.2-0.4(-0.6) mm across, superficial, adpressed, often confluent, with a convex, rugose disc, soon immarginate. Proper exciple poorly developed, of conglutinated, parallel hyphae; epithecium purple-brown-black, inspersed with black granules, K+ intensely purple-red; hymenium colourless, c. 150 μm high, I+ blue; paraphysoids strongly coherent, richly branched and anastomosing, the apical cells clavate; hypothecium dark reddish brown, K-. Asci 4-6(-8)-spored, clavate, fissitunicate, with a well-developed tholus that is K/I- in lower part and K/I+ blue near the apex, lacking an ocular chamber, Rhizocarpon-type. Ascospores 3-septate to submuriform, with 5-7(-9) cells in optical view, dark brown, ellipsoid, 14-23(-28) x 7-12(-15) μm, distinctly halonate at least when young. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: cortex with rhizocarpic acid.
Note: a southern European species of siliceous rocks which starts the life-cycle on the thalli of pertusarioid lichens below the montane belt; to be looked for in other parts of Tyrrhenian Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Pertusaria spp.

Commonnes-rarity: (info)

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

pH of the substrata:

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(info)

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
Herbarium samples
INDEX FUNGORUM GBIF

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Textes_R/Rhizocarpon_lusitanicum.htm
France, 10/10/2014 - Pont de Muzille, Valle-di-Rostino - Corse - (20) - Sur thalle de Pertusaria


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Textes_R/Rhizocarpon_lusitanicum.htm
France, 10/10/2014 - Pont de Muzille, Valle-di-Rostino - Corse - (20) - Sur thalle de Pertusaria


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Textes_R/Rhizocarpon_lusitanicum.htm
France, 10/10/2014 - Pont de Muzille, Valle-di-Rostino - Corse - (20) - Sur thalle de Pertusaria


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Textes_R/Rhizocarpon_lusitanicum.htm
France, 10/10/2014 - Pont de Muzille, Valle-di-Rostino - Corse - (20) - Sur thalle de Pertusaria


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_R/Textes_R/Rhizocarpon_lusitanicum.htm
France, 10/10/2014 - Pont de Muzille, Valle-di-Rostino - Corse - (20) - Sur thalle de Pertusaria



P.L. Nimis CC BY-SA 04
TSB 9716



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9716)
2001/12/01



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9716)
2001/12/01
on the host, Pertusaria sp.