ITALIC 8.0

Rhizocarpon sorediosum Runemark

Opera Bot., 2: 135, 1956.

Synonyms:

Distribution: N - Lomb.

Description: Thallus crustose, episubstratic, dirty yellowish green to grey green, areolate, sorediate, forming 1-3 cm wide patches, often delimited by a thin black prothallus, the areoles contiguous, 0.3-1(-1.2) mm wide, 0.4-0.8 mm thick, rounded to weakly angular, flat to weakly convex, smooth, each one with one or two, 0.1-0.4 mm wide maculiform soralia, the individual soredia 30-50 µm in diam. Cortex 20-30 µm thick, poorly differentiated; medulla white, I+ intensely blue. Apothecia extremely rare, lecideine, black, 0.5-1.5 mm across, more or less round, with a flat to convex disc and a finally often excluded proper margin. 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 weakly muriform, brown, ellipsoid, often poorly developed, c. 20 x 11 µm, halonate at least whyen young. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P- or P+ yellow. Chemistry: cortex with rhizocarpic acid; medulla with barbatic and/or psoromic acid.

Note: on heavy metals-bearing siliceous rocks in upland areas; probably overlooked, being almost always sterile; closely related to Rh. ridescens.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Species of metal-rich rocks

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: extremely rare

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

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

INDEX FUNGORUM GBIF

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC