ITALIC 8.0

Placidiopsis sbarbaronis (Servít) Clauzade & Cl. Roux

Bull. Soc. bot. Centre-Ouest, n.sér., num. spec. 7: 827, 1985. Basionym: Paraplacidiopsis sbarbaronis Servít - Ann. Mus. Civ. Stor. Nat. Genova, 66: 247, 1953.

Synonyms:

Distribution: N - Lig.

Description: Thallus minutely squamulose, the squamules up to 1.2 mm wide, flat to slightly convex, yellowish brown turning faintly olive when wet, the surface covered in smooth, up to 0.2 mm wide, convex warts, the margins crenulate to sublobulate. Upper cortex up to 15 µm thick, colourless or pale brown, consisting of up to 6 µm wide, thin-walled cells, overlain by a 10-15 µm thick epinecral layer; algal layer 60-100 µm thick, paraplectenchymatous, the algal cells arranged in vertically arranged, up to 20 µm wide glomerules; medulla white, up to 100 µm thick; lower cortex absent or poorly developed. Perithecia 2/3 immersed in the center of the squamules, the projecting part c. 0.15 µm across, convex, brown-black. Involucrellum black, appressed to the upper third of exciple, up to 40 µm thick; exciple globose, to 120 µm across, the wall c. 10 µm thick, brown-black throughout; hamathecium of c. 15 µm long periphyses, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, narrowly clavate, thin-walled, apically slightly thickened, with a small ocular chamber, K/I-, 40-45 x12-15 µm, with 1-2-seriately arranged spores. Ascospores 1-septate, hyaline, ellipsoid, 16-17 x 6-8 µm Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a very poorly known species collected by Sbarbaro near Genova, on a cement wall, and only known from the type locality. Breuss (1996) could not see the type, so that its generic placement is not confirmed.

Growth form: Squamulose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: extremely rare

Padanian area: absent

Humid submediterranean belt: extremely rare

Humid mediterranean belt: extremely rare

Dry mediterranean belt: absent

pH of the substrata:

1

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5

(info)

Solar irradiation:

1

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5

(info)

Aridity:

1

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5

(info)

Eutrophication:

1

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5

(info)

Poleotolerance:

0

1

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3

(info)

Altitudinal distribution:

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6

(info)

Predictive model

Paolo Giordani

isotype in GE

Field Museum of Natural History - Botany Department Creator: NSF/Mellon - GPI (c) Field Museum of Natural History - CC BY-NC 4.0 Description: Paraplacidiopsis sbarbaronis Servít, Italy, C. Sbarbaro, Isotype, F

Source: Servít M. 1953. Novae lichenum Pyrenocarporum species in Italia inventae (III). Ann. Mus. Civ. St. Nat. Genova, 66: 236-249. - Public Domain