Gyalidea scutellaris (Bagl. & Carestia) Lettau

Feddes Rep. Beih., 69: 123, 1937. Basionym: Gyalecta scutellaris Bagl. & Carestia - Comm. Soc. Critt. Ital., 1, 5: 442, 1864.
Synonyms: Gyalecta arctica Malme; Gyalecta pseudogeoica Anzi
Distribution: N - Ven, Lomb, Piem (Isocrono & al. 2004).
Description: Thallus crustose, episubstratic, whitish to grey- or green-brown, darker when dry, thin, continuous. Apothecia lecideine, sessile, 0.5-0.8 mm across, translucent when wet, with a pale brown to brown-black (paler when wet), strongly concave disc, and a thick, rough, entire or radially sulcate, usually paler proper margin which is sometimes laterally covered with a whitish, finally excluded thalline layer. Proper exciple 40-60 µm wide laterally, pale yellowish brown to dark brown in outer part, colourless within; epithecium colourless to very pale yellowish brown; hymenium colourless, 130-140 µm high, the hymenial gel I+ yellowish to reddish brown; paraphyses mostly simple, c. 1 µm thick, not thickened at apex, immersed in abundant hyenial gel; hypothecium colourless. Asci 4-8-spored, thin-walled, apically thickened, with a small ocular chamber, K/I-. Ascospores muriform, hyaline, ovoid, with a thin halo, 28-50 x 15-25 µm. Photobiont chlorococcoid, Cystococcus/Leptosira-like. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: an arctic-alpine species found on humid, acid substrata, such as moribund bryophytes and soil rich in humus. With optimum above treeline; restricted to the Alps in Italy.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: extremely 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 CC BY-SA 4.0
GZU Herb.Hafellner (38312)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU Herb.Poelt (44-87)

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU Herb.Hafellner (38312)