Lecania olivacella (Nyl.) Zahlbr.

Cat. Lich. Univ., 5: 739, 1928. Basionym: Lecanora olivacella Nyl. - Flora, 58: 298, 1875.
Synonyms: Lecanora subalbens Nyl.
Distribution: N - Piem (TSB 32902), Lig (Valcuvia & al. 2000). C - Sar. S - Si (Nimis & al. 1996b).
Description: Thallus crustose, episubstratic, areolate-subsquamulose, white-grey to yellowish brown, forming patches to 1.2 cm in diam. Areoles scattered, almost squamulose, 0.4-0.8 mm wide. Apothecia lecanorine, 0.3-0.4(-0.7) mm across, sessile, circular or ellipsoid, with an orange-red to dark brown (uniformly cinnamon-brown when wet), flat to slightly convex disc often surrounded by a darker parathecial ring, and a smooth to crenulate, narrow, whitish or whitish-grey, persistent thalline margin. Thalline exciple overlain by an epinecral layer, with a thin pseudoparenchymatous cortex of isodiametric or oval cells and a medulla rich in algal cells; proper exciple narrow, dark-pigmented in upper part; epithecium brown to orange-brown, with an epipsamma; hymenium colourless, 55-65 μm high; paraphyses mostly simple, the apical cells slightly swollen and pigmented; hypothecium colourless. Asci 8-spored, with a K/I+ blue tholus and a central non-amyloid area, Bacidia-type. Ascospores 1-septate, hyaline, narrowly ellipsoid, (10-)11.5-14 x 4.5-6 μm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a widespread, but rare species found on calcareous and basic siliceous rocks, with a wide altitudinal range; to be looked for further in the Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: rare
Montane belt: rare
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: very rare
Humid mediterranean belt: very 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


E. Pittao CC BY-SA 4.0
TSB 20105



Elena Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20105)
15/02/2017



Elena Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20105)
15/02/2017



Elena Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20105)
15/02/2017



Elena Pittao; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (20105)
15/02/2017