ITALIC 8.0

Verrucaria cernaensis Zschacke

Hedwigia, 67: 50, 1927

Synonyms:

Distribution: C - Sar (Nascimbene & al. 2023).

Description: Thallus crustose, episubstratic, well-developed, 100-300 μm thick or more, not gelatinous when wet, grey-brown to dark brown, strongly rimose, often also with discrete areoles. Cortex with a brown pigment; lower part of medulla often with areas of brown pigment, but without a black basal layer. Perithecia black, 2/3 to completely immersed in thallus, or forming low to moderate, 0.12-0.36 mm wide projections. Involucrellum well-developed, sometimes mainly apical, but often reaching to base-level, more or less appressed to exciple, the sides steeply conical or even vertical; exciple 0.22-0.32 mm across, the wall dark brown, K+ darker brown or greyish brown; hamathecium of periphyses and periphysoids, 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, (15-)18-22(-27) x (7.5-)9.5-11.5(-14) μm, without a perispore. Pycnidia frequent, scattered, 40-60 μm wide. Conidia straight or slightly curved, 4-8 x c. 1 μm. Photobiont chlorococcoid, the cells usually arranged in vertical columns. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on frequently submerged siliceous or calciferous rocks beside lakes and rivers, and on seeping rocks. a species described from the Carpathians, often considered as a synonym of V. aethiobola. According to Thüs (see Nimis 2016) the epithet aethiobola was used for two genetically well-separated taxa: V. aethiobola s.str. and V. cernaensis, and it is likely that at least some of the lowland records from the Alps could refer to the latter species.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Periodically submerged (e.g. in creeks)

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: very rare

Dry mediterranean belt: very rare

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

Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain