ITALIC 7.0

Pertusaria digrediens Nyl.

Act. Soc. Linn. Bordeaux, 53: 91, 1898.

Synonyms:

Distribution: N - TAA, Piem, VA (Piervittori & Isocrono 1999). C - Tosc (TSB 36928), Sar (Rizzi & al. 2011, Giordani & al. 2013). S - Bas (Nimis & Tretiach 1999), Si (TSB 11411).

Description: Thallus crustose, episubstratic, rather thick, grey-white to grey, continuous to finely rimose but usually not areolate, well delimited by a grey-white prothallus, sorediate. Soralia orbicular, well-delimited, slightly immersed in the thallus, strongly convex, pure white. Medulla I+ pale blue. Apothecia frequent, lecanorine, immersed in thalline warts, 1-2(-3) per wart. Asci (1-)2-spored, broadly cylindrical, the apex with a broad ocular chamber, the outer sheath K/I+ blue, otherwise K/I-, with an inner extensible layer, Pertusaria-type. Ascospores 1-celled, hyaline, ellipsoid, (65-)100-150 x 50-70 µm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-; medulla and soralia K+ yellow turning brownish, C-, KC-, P+ orange-red; medulla mostly I+ blue. Chemistry: protocetraric acid.

Note: on siliceous rocks below the subalpine belt; closely related to Lepra leucosora, this taxon deserves further study. It clearly belongs into the genus Lepra.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

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

Poorly known taxon in need of further study

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: extremely 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

P.L. Nimis CC BY-SA 04

TSB 29707

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

Herbarium: TSB (29707)
2001/12/10