ITALIC 8.0

Rhizocarpon renneri Poelt

Planta, 51: 306, 1958.

Synonyms:

Distribution: N - TAA.

Description: Thallus crustose, bluish grey to dark grey, areolate, forming 5-10(-20) mm wide patches on the thalli of Dimelaena oreina, with a dull black hypothallus developing among the areoles. Areoles strongly convex, round to angular, usually contiguous, 0.3-1 mm wide, occasionally the inner ones disintegrating. Cortex poorly differentiated, 5-15 µm thick, overlain by an up to 10 µm thick epinecral layer; medulla white, I+ pale blue. Apothecia lecideine, black, dispersed, to 0.8 mm across, round, with a convex to strongly convex disc and a soon excluded proper margin. Epithecium violet-brown, K+ violet or K-; hymenium colourless, 90-100 µm high; dark grey-brown, K+ red hymenium colourless, 100-140 µm high, K/I+ blue; paraphysoids 1-1.5 µm thick in lower part, the upper cells capitate; hypothecium brown-black. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, with 5-7 cells visible under the microscope, brown-black and almost opaque, ellipsoid, 16-22 x 9-12 µm. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P-. Chemistry: no lichen substances.

Note: on steeply inclined or rain-sheltered surfaces of siliceous rocks, starting the life-cycle on the thalli of Dimelaena oreina; probably more widespread, but never common, in the dry valleys of the Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Subcontinental: restricted to areas with a dry-subcontinental climate (e.g. dry Alpine valleys, parts of Mediterranean Italy)

paras Dimelaena oreina

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: rare

Oromediterranean belt: absent

Montane belt: 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