Buellia sequax (Nyl.) Zahlbr.

Buellia sequax (Nyl.) Zahlbr.

Cat. Lich. Univ., 7: 410, 1931. Basionym: Lecidea sequax Nyl. - Flora, 58: 302, 1875.

Synonyms: Buellia excelsa (Leight.) A.L. Sm.; Lecidea excelsa Leight.

Distribution: C - Tosc (Bungartz & al. 2004). Sar (Giralt & al. 2011). S - Camp (TSB 32280), Si (Bungartz & al. 2004)

Description: Thallus crustose, episubstratic, from thin and poorly developed to areolate or even bullate-subsquamulose, whitish to grey, sometimes delimited by a grey prothallus. Cortex with small crystals dissolving in K; medulla white, with crystals insoluble in K, I-. Apothecia lecideine, black, initially adnate but soon becoming sessile, crowded, often coalescing, to 0.5-0.6(-0.7) mm across, with a flat to strongly convex, epruinose disc, and an initially thick, then thinner and finally excluded proper margin. Proper exciple well developed, up to 80 μm thick, brown throughout, N-, Dispersa-type, of radially arranged hyphae, the inner part of long-celled, parallel, strongly agglutinated and thick-walled hyphae, the outer part of short-celled, isodiametric hyphae without intercellular spaces; epithecium brown, N-; hymenium colourless, 70-90 μm high, inspersed with numerous oil droplets; paraphyses strongly coherent, the apical cells 3-4(-5) μm wide, with a brown cap; hypothecium brown, up to 150 μm high. Asci 8-spored, clavate to cylindrical-clavate, the apical dome K/I+ dark blue with a pale, conical-pointed apical cushion (axial mass), the wall I-, but the thin outer gel I+ blue, Bacidia-type. Ascospores 1-septate, not constricted at septum. brown, ellipsoid with usually pointed ends, (11-)13-15(-18) x (5-)6-7(-8) μm; young ascospores slightly thickened at apex and strongly thickened at septum (Dirinaria-type) or usually only thickened at septum (Physconia-type), the thickenings almost disappearing in mature ascospores (Buellia-type), the wall smooth, the ontogeny of type B (apical inner wall-thickenings produced before septum formation). Pycnidia dark, immersed. Conidia bacilliform, (2-)4-5(-7) x 1-1.2 μm. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ faintly yellow-orange. Chemistry: atranorin, chloroatranorin and diploicin, usually with additional isofulgidin.

Note: a mild-temperate, mainly Mediterranean-Atlantic, much misunderstood species (see Giralt & al. 2011) found on siliceous rocks in the Mediterranean area.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: extremely rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: very rare

Humid mediterranean belt: very rare

Dry mediterranean belt: absent

pH of the substrata:

1

2

3

4

5

(info)

Solar irradiation:

1

2

3

4

5

(info)

Aridity:

1

2

3

4

5

(info)

Eutrophication:

1

2

3

4

5

(info)

Poleotolerance:

0

1

2

3

(info)

Altitudinal distribution:

1

2

3

4

5

6

(info)

Predictive model

Herbarium samples

Felix Schumm; Owner: CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm; Owner: CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm; Owner: CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (21734)
2001/11/22

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[TSB 21734], Sardinia, Prov. Cagliari, WWF Oasis of Monte Arcosu, loc. Concale Petuntu, c. 600 m, on siliceous rocks . Leg. P.L. Nimis, 09.08.1989, rev.Rev. Ch. Scheidegger

Felix Schumm - CC BY-SA 4.0

[ABL27907], Brazil, Santa Catarina, São Francisco do Sul, S of Prainha. 26°14'06'' S, 48°30'05'' W, 10 m. On coastal granite. Leg. M. Cáceres & A. Aptroot (no 27907), 8 October 2015, det. A. Aptroot 2015.

Felix Schumm - CC BY-SA 4.0

[ABL48028], Brazil, Sergipe, Poço Redondo, Cajueiros, Trilha Ecoparque. 09°39'43'' S, 43°40'18'' W, 30 m. On siliceous rock in caatinga. Leg. M. Cáceres & A. Aptroot, (no. 48028), 15 Nov. 2018, det. A. Aptroot 2018.

Felix Schumm - CC BY-SA 4.0

[ABL48028], Brazil, Sergipe, Poço Redondo, Cajueiros, Trilha Ecoparque. 09°39'43'' S, 43°40'18'' W, 30 m. On siliceous rock in caatinga. Leg. M. Cáceres & A. Aptroot, (no. 48028), 15 Nov. 2018, det. A. Aptroot 2018.

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