ITALIC 8.0

Rhizocarpon tavaresii Räsänen

Arch. Soc. Zool.-Bot. Fenn. Vanamo, 3: 85, 1949.

Synonyms: Diplotomma geographicum f. tenellum (Müll. Arg.) Jatta?; Rhizocarpon geographicum f. tenellum Müll. Arg.?

Distribution: C - Tosc, Sar. S - Bas (Puntillo & al. 2012), Cal (Puntillo 1996), Si.

Description: Thallus crustose, episubstratic, areolate, bright yellow-green, dull, forming 1-5 cm wide patches delimited by a thin dark prothallus, the areoles contiguous, angular, (0.1-)0.3-0.6 mm wide, often subdivided into smaller units by cracks, mostly flat, sometimes forming a crescent-shaped collar around the apothecia. Cortex c. 35 μm thick; medulla white, I+ blue. Apothecia lecideine, black, developing between the areoles, 0.2-0.6(-0.7) mm across, angular, with a slightly concave to flat disc and a thin proper margin. Proper exciple brown and K+ brownish red in outer part, paler within; epithecium greenish, poorly delimited against the hymenium, K+ intensifying green or purple-red; hymenium greenish, (65-)120-160 μm high; paraphysoids strongly coherent, richly branched and anastomosing, the apical cells clavate; hypothecium brown, 50-100 μm high, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus that is K/I- in lower part and K/I+ blue near the apex, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, with 15-20 cells visible in optical view, dark brown, oblong-ellipsoid, (25-)28-40 x (13-)16-20(-22) μm. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P+ orange-red or P+ yellow. Chemistry: cortex with rhizocarpic acid, medulla with stictic or psoromic acids.

Note: a mainly south European, poorly known taxon found on basic siliceous rocks at relatively low elevations.

Growth form: Crustose

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: absent

Padanian area: absent

Humid submediterranean belt: rather rare

Humid mediterranean belt: rare

Dry mediterranean belt: very rare

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

INDEX FUNGORUM GBIF DOLICHENS

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome,loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome,800 m. Ad saxa basaltica. Leg. A. Vezda, 08.02.1994. EX A.VEZDA: LICHENES RARIORES EXSICCATI NR. 69.

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome,loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome,800 m. Ad saxa basaltica. Leg. A. Vezda, 08.02.1994. EX A.VEZDA: LICHENES RARIORES EXSICCATI NR. 69.

Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (18195)

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome, loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome, 800 m. Ad saxa basaltica. Leg. A. V zda, 08.02.1994. EX A. V ZDA: LICHENES RARIORES EXSICCATI NR. 69.

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome, loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome, 800 m. Ad saxa basaltica. Leg. A. V zda, 08.02.1994. EX A. V ZDA: LICHENES RARIORES EXSICCATI NR. 69.

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome, loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome, 800 m. Ad saxa basaltica. Leg. A. V zda, 08.02.1994. EX A. V ZDA: LICHENES RARIORES EXSICCATI NR. 69.

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome, loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome, 800 m. Ad saxa basaltica. Leg. A. V zda, 08.02.1994. EX A. V ZDA: LICHENES RARIORES EXSICCATI NR. 69.

Felix Schumm - CC BY-SA 4.0

[VZR69], Insulae Canarienses, Gran Canaria: distr. San Bartolome, loco El Sequen dicto in Barranco de Tirajana, supra urbem San Bartolome, 800 m. Ad saxa basaltica. Leg. A. V zda, 08.02.1994. EX A. V ZDA: LICHENES RARIORES EXSICCATI NR. 69.