Buellia ocellata (Flot.) Körb.

Syst. Lich. Germ.: 224, 1855. Basionym: Lecidea petraea var. ocellata Flot. - Flora, 11: 691, 1828.
Synonyms: Buellia arcularum (Harm.) Lettau; Buellia frisiaca Erichsen; Buellia verruculosa auct. non (Sm.) Mudd; Lecanora victoris Harm.; Lecidea arcularum Harm.; Lecidea kaleida Taylor; Lecidea ocellata subsp. praeponens Nyl.; Rinodina microphthalma A. Massal.; Rinodina ocellata (Flot.) Branth & Rostr. non (Hoffm.) Arnold; Rinodina victoris (Harm.) H. Olivier
Distribution: N - Ven, TAA, Lomb, Piem (Isocrono & al. 2004), Lig. C - Tosc, Abr (Nimis & Tretiach 1999), Sar (Scheidegger 1993, Rizzi & al. 2011). S - Si (Scheidegger 1993, Grillo 1998, Grillo & Caniglia 2004).
Description: Thallus crustose, areolate, pale green grey to yellowish grey, not pruinose, sometimes delimited by a black prothallus, forming patches to 5 cm diam. Areoles rather small, 0.2-1 mm wide, flat to convex; medulla white, I-. Apothecia lecideine, 0.3-0.5 mm across, immersed, with a black, flat, not pruinose disc and a thin, externally poorly visible proper margin, sometimes surrounded by a thalline collar. Epithecium brown, N+ red; hymenium 80-120 μm tall, colourless to pale brown, not inspersed; paraphyses simple; hypothecium pale brown to brown, greenish in upper part. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, brown, ellipsoid, thin-walled throughout, (11-)13-17(-21) x 6.5-11.5 μm, finely warted. Pycnidia immersed. Conidia 4-6 x 0.8-1 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C+ persistent orange, P-, UV-. Chemistry: xanthones, especially arthothelin.
Note: a temperate, perhaps holarctic species found on small siliceous pebbles, but also on steeply inclined faces near the ground, below the subalpine belt.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Pioneer species

Commonnes-rarity: (info)

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


pH of the substrata:

(info)

1

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5

Solar irradiation:

(info)

1

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5

Aridity:

(info)

1

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3

4

5

Eutrophication:

(info)

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4

5

Poleotolerance:

(info)

0

1

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3

Altitudinal distribution:

(info)

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5





Felix Schumm; Owner: CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



P.L. Nimis CC BY-SA 4.0
TSB 21723



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_21723], Italia, Sardinia, Prov. Oristano, M. Ferru, on siliceous rocks which are inundated for short periods after rain. Leg. P:L. Nimis, 09.1989. Rev. Ch. Scheidegger



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21723)
2001/11/22