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, delimited by a thin dark prothallus, forming patches 1-5 cm in diam. Areoles contiguous, angular, 0.1-0.6 mm wide, often subdivided into smaller units by cracks, mostly flat. Cortex c. 35 μm thick; medulla white, I+ blue. Apothecia lecideine, black, developing inbetween the areoles, 0.2-0.7 mm across, round to angular, with a flat to slightly concave 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 red; hymenium greenish, (65-)120-160 μm high; paraphysoids strongly conglutinate, richly branched and anastomosing, apically clavate; hypothecium brown, 50-100 μm high, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores strongly muriform, dark brown, oblong-ellipsoid, 25-40 x 13-16 μm. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P+ red-brown 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

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

Herbarium: TSB (18195)