ITALIC 8.0

Acarospora intermedia H.Magn.

K. svenska Vetensk-Akad. Handl., n.f. 7, 4: 174, 1929

Synonyms:

Distribution: N - VG, Lig (Knudsen & Kocourková 2020). C- Laz, Sar.

Description: Thallus crustose, episubstratic, areolate, pale to dark brown, epruinose. Areoles 0.5-1 mm in diam., 0.2-0.4 mm thick, round to irregular in shape, some of them slightly lobed and with a brown underside. Epicortex lacking; cortex 15-20(-30) μm thick, the upper layer dark brown, 5-10 μm thick, the lower layer brown or colourless, the cells mostly round, 2-4 μm across; algal layer continuous, not interrupted by hyphal bundles, 35-90 μm thick; medulla 75-90 μm thick, mixed with substrate crystals, white and opaque, the medullary hyphae thin-walled, 3-4 μm wide. Apothecia lecanorine, at first immersed, then becoming elevated above the areoles, usually 1-4 per areole, less than 1 mm across, with a brown, round to irregular, often distinctly rugulose, epruinose disc, and a margin that sometimes is darker or paler then the areoles. Proper exciple thin, 5-15 μm wide or indistinct; epithecium dark brown, c. 10 μm high; hymenium colourless, (60-)90-100(-120) μm high, the hymenial gel hemiamyloid, K/I+ light blue fading to light red; paraphyses coherent, 1-2 μm thick at mid-level, the apical cells 2-4 μm wide; subhymenium 20-30 μm high, hypothecium 5-10 μm high, or indistinct. Asci c. 100-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, narrowly ellipsoid to (rarely) ellipsoid, 4-5 x c. 1.5(-2) μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a lowland species of siliceous rocks in sunny situations; poorly developed samples with immersed apothecia are practically undistinguishable from A. veronensis.

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: very rare

Dry mediterranean belt: extremely 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

Index Fungorum GBIF

Kerry Knudsen

Specimen collected by V. Golubkov, 1996 (GSU).