ITALIC 8.0

Rinodina arnoldii H. Mayrhofer & Poelt

Bibl. Lichenol., 12: 54, 1979.

Synonyms:

Distribution: N - TAA (Nascimbene & al. 2022), Lomb. C - Sar (Nöske 2000).

Description: Thallus crustose, episubstratic, rather thick, continuous to usually rimose-areolate, pale grey to grey, usually without a distinct prothallus, or partly with a black prothallus, the areoles 1-7 mm across, rugose, the marginal ones sometimes sublobulate. Apothecia at first cryptolecanorine to lecanorine, rapidly becoming pseudolecanorine, adnate to subsessile, abundant, up to 0.6-1.2(-1.5) mm across, with a flat to slightly convex, dark brown to black disc, and a thin, entire to crenate, finally excluded thalline margin. Thalline exciple 80-100 µm wide laterally, 60-80 µm in lower part, the cortex 5-10 µm thick, paraplectenchymatous, of 5.5-6 µm wide cells; proper exciple 10-15 µm wide, broadening in upper part; epithecium reddish brown, K-; hymenium colourless, 70-90(-110) µm high; paraphyses 2.5-3 µm thick in lower part, the apical cells 4-6 µm thick; hypothecium colourless, forming a stipe in lower part, 100-120 µm high. Asci 8-spored, cylindrical-clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores (0-)1-septate, often finally with slightly unequal cells, brown, ellipsoid to broadly ellipsoid, (13-)15-20(-25.5) x (7-)8-11(-14) µm, the torus absent of poorly developed, the wall roughtly warted, Milvina-type, but many of them grading into the Pachysporaria-type, the ontogeny of type A (apical wall thickening after septum formation). Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: zeorin (traces).

Note: on calciferous schists and sandstone near and above treeline. The Italian records need confirmation; for further details see Giralt & Llimona (1997).

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: very rare

Subalpine belt: very rare

Oromediterranean belt: extremely rare

Montane belt: absent

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