Roccellographa circumscripta (Leight.) Ertz & Tehler

Fungal Divers., 49: 58, 2011. Basionym: Sagedia circumscripta Leight. - Brit. Angiocarp. Lich.: 24, 1851.
Synonyms: Chiodecton leucinum (Nyl.) Zahlbr.; Chiodecton pruinosum (B. de Lesd.) Zahlbr.; Enterographa leucina (Nyl.) A. Massal.; Peterjamesia circumscripta (Leight.) D. Hawksw.; Sclerophyton circumscriptum (Leight.) Zahlbr.; Sclerophyton circumscriptum f. dendrizum (Nyl.) Zahlbr.; Sclerophyton circumscriptum f. leucinum (Nyl.) Redinger; Sclerophyton circumscriptum f. pruinosum (B. de Lesd.) Redinger; Sclerophytonomyces circumscriptus (Leight.) Sparrius & P. James; Stigmatella circumscripta (Leight.) Mudd nom. illegit.; Stigmatidium crassum var. leucinum (Nyl.) H. Olivier; Stigmatidium leucinum Nyl.; Stigmatidium pruinosum B. de Lesd.; Verrucaria circumscripta Taylor nom. illegit.
Distribution: C - Sar. S - Si.
Description: Thallus crustose, episubstratic, continuous to rimose-areolate, white to pale grey, slightly farinose, often forming mosaics, the individual thalli delimited by a thin grey-black prothallus. Upper cortex lacking but epinecral layer usually present; medulla white, cretaceous. Apothecia immersed, punctiform, oval or elongate, up to 0.1 mm across, usually numerous, scattered, clustered, or arranged in lines, not aggregated into stromata, with a flat, black, but often whitish-pruinose disc. Proper exciple up to 15 µm thick, brown in upper part, pale below; hymenium colourless, 100-150 µm thick, I+ blue, K/I+ pale blue; paraphysoids richly anastomosing, 2-2.5 µm thick; hypothecium colourless to pale brown. Asci 8-spored, cylindrical, Opegrapha-type. Ascospores 4-7-septate, constricted at septa, dark brown, oblong-ovoid to oblong-fusiform, 17-26 x 5-7 µm, with a thick gelatinous sheath. Photobiont trentepohlioid. Spot tests: thallus and medulla K- or K+ pale yellow, C-, KC- or KC+ pale yellow, P+ yellow-orange, UV-. Chemistry: psoromic acid (major) and 2'-O-demethylpsoromic acid (minor).
Note: a tropical to subtropical-temperate species of oceanic, coastal areas, with a subcosmopolitan distribution (see Sparrius 2004), found on very hard siliceous rocks subject to humid maritime winds, mostly under overhangs; extremely rare and worthy of protection in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
In underhangs rarely wetted by rain
Taxon bound to maritime-coastal situations

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: extremely rare
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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Predictive model
Herbarium samples
Index Fungorum GBIF


P.L. Nimis CC BY-SA 4.0
TSB 17150



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (17150)
2001/11/30


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Cap de la Chèvre


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Pointe de Pen-Hir


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Pointe du Van
with Arthonia atlantica


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Pointe du Van
fertile and sorediate form together


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Pointe du Van


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon Kernaou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon Kernaou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon Kernaou


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=46&lang=en
France, Crozon Kernaou


Bernard Bouffinier - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=132&lang=en
France, Pointe du van
with Ingaderia sorediata


Bernard Bouffinier - Source:http://www.lichensmaritimes.org/index.php?task=fiche&lichen=132&lang=en
France, Pointe du Van
with Ingaderia sorediata