ITALIC 7.0

Stereocaulon tornense (H. Magn.) P. James & Purvis

in Purvis & James, Lichenologist, 17: 236, 1985.. Basionym: Bilimbia tornensis H. Magn. - Ark. Bot., Ser. 2 2: 144, 1952.

Synonyms:

Distribution:

Description: Thallus crustose, areolate, without cephalodia and pseudopodetia. Areoles scattered to contiguous, up to 0.5 mm wide, grey, swollen, with thick, raised margins and a darker central area (best visible in young areoles), sometimes sorediate, the finely granular soredia finally occupying the whole surface. Apothecia developing between the areoles, up to 1.5 mm across, with a black, convex disc and an indistinct proper margin. Paraphyses simple, slightly thickened above, with dark cap; hymenium colourless; hypothecium dark brown. Asci 8-spored, clavate to cylindrical, Porpidia-type. Ascospores (1-)3-septate, hyaline, fusiform with rounded ends, (18-)21-26(-30) x 5-8 µm. Photobiont chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ faintly yellow; soralia K+ yellow, P+ orange, UV-. Chemistry: atranorin and stictic acid.

Note: on siliceous pebbles in humid situations; widespread in Central and Northern Europe but rare in the Alps, being known only from the Eastern Alps (Austria); to be looked for in the Italian Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

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

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: extremely rare

Oromediterranean belt: absent

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

Einar Timdal. Source: http://www.nhm2.uio.no/botanisk/lav/Photo_Gallery/Stereocaulon/tornense_G=Iceland+Snaefellsnessysla_D=20050720_H=O-L138142_O=E-Timdal_C=ET_I=DSCN0242.JPG