Buellia griseosquamulata Scheid.

Lichenologist, 25: 25, 1993.
Synonyms:
Distribution: C - Sar (Scheidegger 1993).
Description: Thallus crustose, episubstratic, areolate-subsquamulose, grey, developing on the thalli of Buellia tyrolensis. Medulla white, I-. Apothecia lecideine, black, 0.3-0.5 mm across, sessile but not constricted at base, with a flat, epruinose disc, and a thin, prominent proper margin. Proper exciple 18-25 µm wide, Aethalea-type, the inner hyphae hyaline, prosoplectenchymatous, the outer hyphae parallel and usually strongly brown-pigmented, N-; epithecium brown; hymenium colourless, c. 55 µm high, without oil droplets; hypothecium dark brown, c. 100 µm high. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass), the wall I-, but the thin outer gel I+ blue, Bacidia-type. Ascospores 1-septate, not constricted at septum, brown, broadly oblong, 9.5-11 x 5-9 µm, Physconia-type, smooth-walled. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: hitherto known only from the type collection, on granite near the coast.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Buellia tirolensis
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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(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
Index Fungorum GBIF

Modified from: https://gzu.jacq.org/GZU000338857
GZU000338857 - J. Poelt - Date 1986-05-06 Location Italy / Sardegna Label Flora von Sardinien. Provinz Sassari: Capo d'Orso E Palau ; Alt. 60 m - 109 m Habitat hohe Granitfelsen, Macchie


Source: Scheidegger C. 1993. A revision of European saxicolous species of the genus Buellia De Not. and formerly included taxa. Lichenologist, 25, 4: 315-364.
FIG. 1. Buellia griseosquamulata (above) growing as a lichenicolous lichen on B. tirolensis (below). Scale =1 mm.