ITALIC 8.0

Verrucaria mimicrans Servít

Stud. Bot. Cech., 11: 116, 1950.

Synonyms:

Distribution: N - Lig. C - Tosc (Breuss 2008b).

Description: Thallus crustose, endosubstratic or thinly episubstratic, whitish grey to very pale brown, uneven, continuous to irregularly rimose, without a distinct prothallus, often poorly evident. Cortex not developed, algal layer within the substrate, the hyphae obscured by substrate particles. Perithecia black, hemispherically projecting, rough, with a thin thalline cover at base. Involucrellum black, usually limited to the upper third, at most extending down to mid-level, more or less diverging from exciple, the apical part 50-80(-100) µm thick, usually thinning towards the base; exciple subglobose, 0.3-0.5 mm across, the wall colourless or brown (darker around the ostiole), 20-30 µm thick; hamathecium of 40-60 µm long, thin, finely branched-anastomosing 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, (22-)24-30(-31) x (10-)11-15(-16) µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a rather poorly known species described from former Yugoslavia, differing from V. muralis in the larger spores, the longer periphyses and in the form of the involucrellum; the total distribution covers wide parts of Europe and the species is also known from North America (see Breuss 2004, 2008b). It is a pioneer species on more or less calcareous substrata, especially on pebbles and on recently exposed rock surfaces, usually at relatively low elevations.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

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

Index Fungorum GBIF

Curtis Randall Björk CC BY-SA 4.0

Idaho, Idaho County, Hells Canyon, Big Dry Gulch Date: 2010-05-01 On limestone cliff in brushy grassland

Curtis Randall Björk – CC BY-SA 4.0

Idaho, Idaho County, Hells Canyon, Big Dry Gulch Date: 2010-05-01 On limestone cliff in brushy grassland