ITALIC 8.0

Rhizocarpon epispilum (Nyl.) Zahlbr.

Cat. Lich. Univ., 4: 333, 1926. Basionym: Lecidea epispila Nyl. - Bull. Soc. Linn. Normandie, sér. 2, 4: 292, 1872.

Synonyms: Buellia epispila (Nyl.) B. de Lesd.; Rhizocarpon superstratum J. Steiner

Distribution: N - Lig (Giordani & Brunialti 2000). C - Marc (Nimis & Tretiach 1999), Sar (Nöske 2000). S - Bas (Brackel & Puntillo 2023).

Description: Thallus crustose episubstratic, areolate, forming small islands on the thalli of saxicolous Pertusaria-species, often surrounded by a black prothallus reacting I+ blue. Areoles convex, brown, glossy, mostly contiguous. Medulla white, I-. Apothecia lecideine, black, developing between the areoles, 0.2-0.5 mm across, with an initially flat, then often convex disc and a thin, very soon excluded proper margin. Proper exciple of radiating hyphae, brown black and K- in outer part, colourless within, the medullary part of 1-2 µm thick, anastomosing hyphae; epithecium reddish brown, K+ purple-red; hymenium colourless, I+ blue; paraphysoids branched and anastomosing, slender, the apical cells scarcely swollen; hypothecium brown-black, K-. Asci 8-spored, slightly 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 1-septate, brown, (16-)19-26(-32) x 9-15(-18) µm, halonate at least when young. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.

Note: on sheltered siliceous rocks wetted by rain, starting the life-cycle on thalli of Pertusaria-species below the montane belt; probably more widespread, but overlooked, throughout Central and Southern Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

paras Pertusaria spp.

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: rare

Humid mediterranean belt: very rare

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

Herbarium samples

INDEX FUNGORUM GBIF

P.L. Nimis CC BY-SA 4.0

TSB 16767

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (16767)
2001/12/01
on the host, Pertusaria sp.

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (16767)
2001/12/01