ITALIC 8.0

Verrucaria weddellii Servít

Stud. Bot. Cech., 7: 80, 1946.

Synonyms: Verrucaria transiliens auct. non (Arnold) Lettau

Distribution:

Description: Thallus crustose, episubstratic, rimose-areolate, brown, smooth to slightly rough, 0.2-0.4 mm thick, the areoles angular, flat to slightly convex, 0.3-0.6 mm wide, incompletely subdivided by cracks. Cortex 10-20 µm thick, overlain by a thin epinecral layer; algal layer 50-100 µm thick; medulla subparaplectenchymatous, with a colourless upper part and brownish lower zone with substrate particles and crystals, not forming a black basal layer. Perithecia black, 1-3 per areole, remaining immersed in raised portions of the areoles and almost completely covered with a thalline layer, only the very tips naked. Involucrellum extending almost to base-level, laterally 40-80 µm thick, slightly thinning toward the base, arching slightly away from exciple, the space inbetween pale and packed with crystals; exciple subglobose, 0.3-0.4 mm across, the wall 20-25 µm thick, brown to brown-black; hamathecium of branched-anastomosing periphysoids measuring 35-50 x 2.5-4 µm, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid or oblong-ovoid, 20-25 x 9-12 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: according to Roux & Coll. (2025), this very poorly known species, often confused with V. transiliens, is probably known only from the type locality in France (Hérault, on basalt).

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: absent

Subalpine belt: absent

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

Source: Servit, M 1949: Nove nebo mene zname druhy lisejnikove celedi Verrucariaceae. Species Verrucariacearum (Lichenes) novae vel minus cognitae. - Sbornik Narodniho Musea v Praze 5(9): 1-51. Tab.3 - Public Domain