ITALIC 7.0

Verrucaria pseudovirescens Servít

Preslia, 24: 379, 1952.

Synonyms:

Distribution: N - Ven (Anzi, Lich. Rar. Ven. 158, sub V. nigrescens var. virescens: Breuss & Berger 2010), Lig (GDOR 90). C - Sar (Nascimbene & al. 2023).

Description: Thallus crustose, episubstratic, areolate, 0.25-0.35 mm thick, dark olive-brown to brown, the areoles 0.5-0.9 mm wide, mostly flat, sometimes partially subdivided into smaller units. Cortex thin, small-celled (the cells 4-5 μm wide); algal layer 100-150 μm thick; medulla white to partially brownish in lower part, filled with substrate particles. Perithecia black, 1-2 per areole, almost completely immersed to 1/3 projecting, the apical part flat to convex, 0.25-0.45 mm wide. Involucrellum reaching down to ½–⅔ of the perithecium, 60-90 μm thick laterally, unsharply delimited and often fringed-eroded in lower part, partially surrounded by brownish medullary tissue; exciple globose, 0.2-0.4 mm across, the wall colourless to brown, c. 15 μm thick; hamathecium of weakly branched and anastomosing, 35-50 μm long 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, 17-22 x (7-)8-11 μm. Pycnidia black, small, immersed. Conidia straight or slightly curved, 5-6 x c. 1 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: closely related to V. macrostoma, but differing in the thinner thallus, smaller perithecia and spores (see Breuss & Berger 2010), this species is known from a few localities only (Italy, Austria, Germany and Russia), but is probably more widespread, having been confused with V. macrostoma and V. nigrescens (Breuss 2016).

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: very rare

Padanian area: very rare

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

Herbarium samples

Index Fungorum GBIF

Source: • • Breuss O. 2016. Über einige von Miroslav Servít beschriebene Verrucaria-Arten (lichenisierte Ascomycota, Verrucariaceae). Herzogia, 29

Source: Servít M. Nové a málo známé druhy z čeledí Verrucariaceae a Dermatocarpaceae. Preslia 24: 245-390, 1952, Tab. 3 – Public Domain