ITALIC 7.0

Ramalina arsenii Sérus., van den Boom & Magain

Lichenologist, 53: 434, 2021

Synonyms:

Distribution: N - Lig (Ravera & al. 2022b).

Description: Thallus fruticose, pale yellowish green to green, branched, the branches developing from a basal holdfast, erect, ascending or pendulous, 1–2(-3) cm long, starting as erect cushions of dichotomously divided and applanate lobes, the younger parts palmately or dichotomously branching, the surface of tiny branchlets with narrow longitudinal pseudocyphellae, rarely opening with minutely verrucose margins; soralia irregularly lip-shaped, at first forming on dissolving, old lateral or terminal, flattened branches, eventually expanding mainly on the lower surface, more rarely on the upper parts of lateral branches, sometimes giving rise to an extensively sorediate underside; smaller branches with delicate, phyllidioid-flattened lobes that can be a dominant feature of some thalli; old lobes sometimes with a helmet-shaped apex. Apothecia extremely rare known only in the immature state Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: cortex with usnic acid; medulla with evernic acid.

Note: a recently-described species, apparently widespread in the Alps and also known from the Pyrenees, mostly growing beneath overhangs of weakly calciferous rocks at low elevations, more rarely on bark. The species is likely to be more frequent in Italy, because in the past it might have been identified as R. pollinaria.

Growth form: Fruticose

Photobiont: green algae other than Trentepohlia

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

In underhangs rarely wetted by rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: very rare

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