Gyalolechia pruinosa Körb.

Ver. zool.-bot. Ges. Wien, 17: 703, 1867.
Synonyms: Caloplaca aurea f. rupicola (Arnold) Zahlbr.; Caloplaca pruinosa (Körb.) Zahlbr.; Fulgensia pruinosa (Körb.) Poelt; Fulgensia pruinosa var. fissiseda Poelt
Distribution: N - TAA, Lomb. C - Abr.
Description: Thallus crustose-placodioid, episubstratic, whitish yellow to orange-yellow, pruinose in central parts, forming 1-2 cm wide rosettes. Areoles 1-2(-3) mm broad, flattened, contiguous, the marginal ones distinctly elongate, anchored to thin layers of soil in rock fissures by rhizine-like bundles of hyphae. Apothecia frequent, numerous, zeorine, rounded, sessile, 0.5-1(-2) mm across, with a reddish orange to brownish orange, flat, rugose disc and a thin, orange-yellow, pruinose margin. Epithecium brownish orange, K+ red; hymenium colourless, 70-80 μm high; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, hyaline, fusiform, thin-walled, 18-27(-30) x 5-8 μm. often slightly constricted at septum. Pycnidia orange-yellow, immersed. Conidia bacilliform. Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-, UV+ pale orange. Chemistry: thallus and apothecia with parietin, emodin, small amounts of fallacinol and fallacinal.
Note: on steeply inclined to underhanging faces of calcareous rocks, mostly in fissures, sometimes on epilithic bryophytes, with optimum above treeline; var. fissiseda grows on the top of birds' perching boulders.
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: rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: absent
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

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU Herb.Mayrhofer (12828)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU Herb.Mayrhofer (12828)