ITALIC 7.0

Verrucaria poeltii (Servít) Breuss

Linzer biol. Beitr., 22: 721, 1990. Basionym: Involucrocarpon poeltii Servít in Poelt - Feddes Repert., 58: 168, 1955.

Synonyms:

Distribution: N - Frl (Breuss & Berger 2012).

Description: Thallus crustose, episubstratic, rimose-areolate, dark brown when dry, dark olive-brown when wet, 0.2-0.5 mm thick, sharply delimited, often with a black prothallus, forming 5-20 mm wide patches, the areoles 0.2-1 mm wide, polygonal with sharp angles, separated by thin fissures. Cortex 20-35 μm thick, of thick-walled cells with small lumina, without an epinecral layer; algal layer compact, 100-350 μm thick; medulla white, containing rock particles, often blackening near the perithecia, but without a black basal layer. Perithecia black, rather sparse, c. 20/cm², 1-3 per areole, ½–¾ immersed in the thallus, the upper part projecting, conical to hemispherical, 0.3-0.5 mm across, with a narrow ostiole (c. 0.1 mm). Involucrellum adpressed to exciple, reaching down ½-⅔ of the perithecium, 50-80(-100) μm thick in upper part, becoming progressively thinner downwards: exciple 0.25-0,4(-0.5) mm across, the wall 20-30 μm thick, at first colourless, then soon brown to black; hamathecium of 25-30 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, broadly ellipsoid to globose, (9-)10-13(-14) x 7-9 μm. Pycnidia rare, fully immersed, with a colourless wall, 100-150 μm across. Conidia bacilliform, straight to slightly curved, 6-8 x c. 1 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on very compact calcareous rocks. The record is actually from Austrian territory, but very close to the border, and the species seems to be common and widespread in the Austrian Alps. For the differences with the very similar V. finitima and V. fischeri see Breuss & Berger (2012).

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: very 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

O. Breuss - Source: BREUSS, O., 2022: Bemerkenswerte Flechtenfunde aus Österreich. – Österr. Z. Pilzk. 30: 11–21.

TÜRK 50.571. Bildbreite 5 mm.

Source: • Breuss O., Berger F. 2012. Die Validierung von Verrucaria finitima und Bemerkungen über den Formenkreis von Verrucaria tristis (lichenisierte Ascomyceten, Verrucariaceae). Öst. Z. Pilzk., 21: 117-126.