Buellia saxorum A. Massal.

Ric. Auton. Lich. Crost.: 82, fig. 169, 1852.
Synonyms: Buellia superans (Nyl.) Mong.; Lecidea saxorum (A. Massal.) Hepp; Lecidea superans Nyl.
Distribution: N - Ven (Lazzarin 2000b), Lig. C - Tosc, Sar (B-189700).
Description: Thallus crustose, episubstratic, rather thin, rimose or areolate, white, often forming patches of more than 5 cm in diam., sometimes delimited from conspecific thalli by a black prothallus; medulla amyloid, 1+ violet. Apothecia lecideine, black, 0.4-0.8 mm across, sessile and constricted at base, with a flat to convex disc and a thick, prominent, persistent, often sinuous proper margin. Proper exciple c. 100 µm wide, of intricate hyphae, homogeneously dark brown, with an additional orange pigment reacting K+ reddish (solution), the inner part with textura intricata, the outer part with textura oblita, leptocline-type; epithecium brown; hymenium colourless, without oil droplets, c. 80 µm high; hypothecium dark reddish brown. Asci 8-spored, Bacidia-type. Ascospores 1-septate, brown, oblong, constricted at septum, 12-14 x 6-7.5 µm, Physconia-type, with a microrugulate ornamentation. Pycnidia flask-shaped, black, immersed in thallus. Conidia bacilliform, 4.5-7.5 µm long. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C+ red, KC+ red, P- or P+ very faintly yellow. Chemistry: atranorin, gyrophoric and lecanoric (trace) acids.
Note: on steeply inclined surfaces of hard siliceous rocks, mostly not far from the coast.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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


pH of the substrata:

(info)

1

2

3

4

5

Solar irradiation:

(info)

1

2

3

4

5

Aridity:

(info)

1

2

3

4

5

Eutrophication:

(info)

1

2

3

4

5

Poleotolerance:

(info)

0

1

2

3

Altitudinal distribution:

(info)

1

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3

4

5





Felix Schumm; Owner: CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



Felix Schumm; Owner: CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (13038)
2001/11/22



Felix Schumm - CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger



Felix Schumm - CC BY-SA 4.0
[TSB_13038], Italy, Tuscany, Island of Capraia, loc. Torre del Porto, c. 20 m on trachyandesitic rocks near the sea. Leg. P.L. Nimis, M. Tretiach & M. Castello, 29.03.1988. Rev. Ch. Scheidegger