ITALIC 8.0

Rhizocarpon eupetraeum (Nyl.) Arnold

Flora, 53: 478, 1870. Basionym: Lecidea eupetraea Nyl. - Flora, 53: 36, 1870.

Synonyms: Lecidea parapetraea Nyl.; Lecidea petraeiza Nyl.; Rhizocarpon arcticum Räsänen; Rhizocarpon birgittae; Rhizocarpon dissentiens Arnold; Rhizocarpon endamyleum Th. Fr.; Rhizocarpon grande (Flörke ex Flot.) Arnold; Rhizocarpon grande f. eupetraeum (Nyl.) Th. Fr.; Rhizocarpon parapetraeum; Rhizocarpon petraeizum

Distribution: N - Ven, TAA, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999), Emil (Fariselli & al. 2020). C - Tosc, Marc, Mol (Nimis & Tretiach 1999). S - Pugl (Nimis & Tretiach 1999).

Description: Thallus crustose, episubstratic, whitish grey, grey to rarely pale brown, areolate, delimited by a dark prothallus, forming patches 2-6 cm in diam. Areoles contiguous, 0.3-1(-1.4) mm wide, 0.4-0.8 mm thick, strongly convex, smooth, dull. Medulla white, I+ blue. Apothecia lecideine, black, 0.3-1(-1.5) mm across, with soon convex disc and a thin, soon excluded proper margin. Epithecium brown to brown-black, K+ strongly red, rarely K-; hymenium colourless, 100-140(-160) µm high; hypothecium brown Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, many-celled, dark brown to brown-black, 19-40 x 10-18 µm. Pycnidia black, subglobose, developing on the prothallus or immersed in the areoles. Conidia hyaline, filiform, 8-14 x 0.5-1.4 µm. Photobiont chlorococcoid. Spot tests: medulla K+ yellow turning red, C-, KC-, P+ pale yellow. Chemistry: norstictic acid.

Note: on inclined to vertical faces of acidic siliceous rocks, mostly sandstone, with a wide altitudinal range, up to the nival belt in the Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rare

Subalpine belt: very rare

Oromediterranean belt: extremely rare

Montane belt: extremely rare

Submediterranean belt: extremely rare

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

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 04

TSB 24997

Pier Luigi Nimis - CC BY-SA 4.0

Herbarium: TSB 25997

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php