ITALIC 7.0

Variospora dolomiticola (Hue) Arup, Søchting & Frödén

Nord. J. Bot., 31: 80, 2013. Basionym: Lecanora dolomiticola Hue - Ann. Mycol., 13: 83, 1915.

Synonyms: Caloplaca velana var. dolomiticola (Hue) Clauzade & Cl. Roux

Distribution: N - Frl (TSB 1450), TAA (type material).

Description: Thallus crustose, episubstratic, of angular, 0.4-1.2 mm wide, orange to yellow-orange areoles, rarely subcontinuous and finely cracked, usually well-delimited, sometimes with a black hypothallus, forming up to 3 cm wide patches. Cortex 25-95 μm thick, paraplectenchymatous, with yellowish orange crystals at the surface; medulla paraplectenchymatous; algal layer discontinuous. Apothecia zeorine, frequent, usually angular by mutual compression, 0.2-0.8(-1) mm across, at first immersed in the areoles, then subsessile, with an initially flat, then sometimes convex, orange to brownish orange disc and a usually slightly paler, smooth, persistent margin. Thalline exciple well-developed, with many algae; proper exciple 85–100 μm wide, prosoplectenchymatous; epithecium orange, granular, K+ red; hymenium colourless, 50-90(-100) μm high; paraphyses sparingly branched in upper part, the apical cells swollen, up to 4-6 μm wide; hypothecium colourless, sometimes with oil droplets, prosoplectenchymatous. hyaline, very variable, Ascospores 2-celled, polarilocular, hyaline, ellipsoid to broadly ellipsoid, 9-13 x 5-10 μm, the equatorial thickening (“septum”) 3-5 μm (1/4-1/2 of spore length). Photobiont chlorococcoid. Spot tests: thallus and apothecia K+ red, C-, KC-, P-. Chemistry: thallus and apothecia with parietin (major), fallacinal, emodin, teloschistin and parietinic acid (minor), corresponding with chemosyndrome A of Søchting (1997).

Note: a still poorly understood species, often considered as a synonym of V. velana, growing on dolomite and schists in upland areas, with optimum above the montane belt.

Growth form: Crustose placodiomorph

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: 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

Herbarium samples

Index Fungorum GBIF

P.L. Nimis CC BY-SA 04

TSB 41350