Caloplaca tenuata (Nyl.) Zahlbr.

Cat. Lich. Univ., 7: 271, 1931. Basionym: Placodium tenuatum Nyl. - Flora, 62: 202, 1877.
Synonyms:
Distribution: C - Mol (Genovesi & Ravera 2014).
Description: Thallus crustose-placodioid, episubstratic, ochre-yellow to ochre-orange, areolate in central part, clearly lobed at margin, forming up to 1 cm wide, orbicular, sometimes confluent patches; marginal lobes 0.3-0.7 mm wide, short and contiguous, flattened to weakly convex. Apothecia biatorine/zeorine, at first semi-immersed in the areoles, then sessile, with a bright orange disc and a somewhat paler, smooth proper margin. Epithecium brownish orange, K+ red; hymenium colourless; paraphyses branched in upper part, 1-1.5 µm thick at base, the apical cells up to 5 µm wide; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, polarilocular, sometimes slightly constricted at septum, hyaline, narrowly and long-ellipsoid to almost fusiform, straight or curved, 12-20 x 4-6 µm, the septum 1-4 µm thick (c. ¼ of spore length). Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-. Chemistry: thallus and apothecia with different anthraquinones.
Note: on sunny surfaces of compact calcareous rocks, often on cyanobacterial crusts; this species was frequently confused with Flavoplaca polycarpa. The record from Sicilia, by Ottonello & Salone (1994) is dubious, and that from Venezia Giulia reported by Nimis (1993: 185) refers to F. polycarpa (vidi!).
Growth form: Crustose placodiomorph
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: absent
Submediterranean belt: very rare
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: very 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 - CC BY-SA 4.0
[19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420.



Felix Schumm - CC BY-SA 4.0
[19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420.



Felix Schumm - CC BY-SA 4.0
[19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420.



Felix Schumm - CC BY-SA 4.0
[19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420.



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420



Felix Schumm; Owner: Felix Schumm - CC BY-SA 4.0
19607], Gallia, Vauclise, Lafare, in praerupta La Salle dicta, alt. 400 m, ad parietem altum rupis calcareae. Leg. G. Clauzade et Cl. Roux, 8.01.1976. VEZDA: LICHENES SELECTI EXSICCATI NR. 1420