ITALIC 8.0

Verrucaria fuscoatroides Servít

Sborn. Narodn. Mus Praze, 5, B, 9, bot. 3: 26, 1949.

Synonyms:

Distribution: N - Lig.

Description: Thallus crustose, episubstratic, areolate, 0.15-0.3 mm thick, dull grey-brown, ochre-brown or dark brown, olive-brown when wet, without a distinct prothallus, the areoles 0.2-0.5(-0.7) mm wide, flat to slightly convex, with obtuse to acute angles, separated by relatively large fissures. Cortex poorly developed, brownish, with a thin epinecral layer; medulla white to partially brownish (especially around the perithecia), but not forming a black basal layer, often with rock fragments and crystals. Perithecia black, 1(-2) per areole, half- to 3/4 immersed, the projecting part flattened to conical, 0.2-0.3 mm across. Involucrellum appressed to exciple, reaching down at least to mid-level, sometimes to base-level, 40-60 μm thick laterally, often (but not always) 70-80(-100) μm thick at base; exciple broadly pyriform, 0.25-0.4 mm across, the wall 15-20 μm thick, brown to dark brown; hamathecium of periphysoids measuring 25-40 x 2-2.5 μm, with larger, globose terminal cells, 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, 70-95 x 25-30 µm. Ascospores 1-celled, hyaline, ellipsoid, 20-30(-35) x (9-)10-13(-15) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on more or less calciferous rocks. An apparently rather widespread, but still poorly known species described from Germany and also known from Notrth America, reported from several localities in the Austrian Alps (see Breuss 2008b and Breuss & Berger 2010) and the French Alps (Roux & Coll. 2025).

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: very rare

Subalpine belt: very rare

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: very rare

Padanian area: absent

Humid submediterranean belt: very rare

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

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.1 - Public Domain

Source: Breuss O. 2008b. Bemerkungen zu einiger Arten der Flechtengattung Verrucaria. Sauteria, 15: 121-138. Author: Othmar Breuss