ITALIC 8.0

Verruculopsis minuta (Hepp) Krzew.

Polish Bot. Stud., 27: 115, 2012. Basionym: Verrucaria lecideoides var. minuta Hepp - Flecht. Eur.: nr. 683, 1860.

Synonyms: Verrucaria minuta (Hepp) Zschacke

Distribution: N - Ven, TAA, Lomb, Lig. C - Tosc, Sar.

Description: Thallus crustose, episubstratic, 0.1-0.2(-0.3) mm thick, minutely areolate, whitish to pale brown. Areoles 0.2-0.3(-0.5) x 0.1–0.3 mm, tetragonal to nearly rounded, separated by large (0.1-0.15 μm) cracks, the margins concolorous with upper surface or paler. Cortex (pseudocortex) weakly differentiated, 20-30 μm thick, colourless to pale brown, overlain by an epinecral layer; algal layer 80-100 μm thick; medulla white, 100-150 μm thick, with crystals visible under polarized light, I-, without a black basal layer. Perithecia globose or conical, 0.2-0.3 mm across, mainly marginal or arising between the areoles, the apical part sometimes slightly flattened. Involucrellum hardly distinguishable from exciple, completely surrounding it; exciple 0.15-0.2 mm across, the wall paraplectenchymatous, thick, dark brown to black, pale brown only at base; hamathecium of periphyses along the ostiolar channel, short pseudoparaphyses in upper part of the perithecium, and paraphyses tending to disappear early, the periphyses 10-15 x 1-1.5 μm; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, fissitunicate and bitunicate, the wall not amyloid, not or only slightly thickened above, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 11-15(-18) x 5-7(-8) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: very closely related to V. lecideoides, but more frequent on basic siliceous rocks. See also note on Verrucaria porphyricola.

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: very rare

Submediterranean belt: rare

Padanian area: absent

Humid submediterranean belt: rather rare

Humid mediterranean belt: 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

Herbarium samples

P.L. Nimis CC BY-SA 04

TSB 11615

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

Pier Luigi Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (11615)

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