Gyalectidium minus Sérus.

in Ferraro & al., Bot. J. Linn. Soc., 137: 340, 2001.
Synonyms:
Distribution: S - Camp (Puntillo & al. 2000, Puntillo 2000, Nimis & Tretiach 2004, Ferraro & al. 2001, Puntillo & Puntillo 2011).
Description: Thallus crustose, thinly episubstratic, forming 0.3-1.5 mm wide, angular to rounded, often sublobulate patches, areolate-bullate, the areoles encrusted with a continuous layer of crystals, silvery to whitish grey, sometimes patchily greenish at margins. Hyphophores submarginal to marginal, their scales small, emerging from a slightly inflated crystalline bulge, obliquely orientated, triangular to irregularly laciniate, 0.07-0.1 mm long and 0.1-0.2 mm broad, bluish grey when young, turning whitish and translucent when old. Apothecia very rare and usually immature or poorly developed, 1-3(-4) per thallus patch, 0.1-0.15 mm across, with a pale orange, pinkish or dark grey disc, and a slightly prominent, whitish margin. Ascospores not known. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: only known from a single station in Italy, on leaves of Buxus, Laurus, Phillyrea, and on cladodes of Ruscus in a warm-humid, coastal gorge; earlier records of G. caucasicum from Italy refer to this species, which is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: leaves
Photobiont: green algae other than Trentepohlia
Restricted to humid-warm, oceanic areas

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


P.L. Nimis CC BY-SA 4.0
TSB 10524


Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 9492



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (10524)
2001/11/24