ITALIC 8.0

Acarospora admissa (Nyl.) Kullh.

Not. Sällsk. Fauna Fl. Fenn. Förh., Ny Ser. ,11: 272, 1871 (1870). Basionym: Lecanora admissa Nyl. - Flora, 50: 370, 1867

Synonyms: Acarospora discreta (Ach.) Th.Fr.; Acarospora durietzii H.Magn.

Distribution: N - TAA (Knudsen & Kocourková 2020).

Description: Thallus crustose, episubstratic, areolate, pale chestnut brown to dark brown or black, the areoles of various colours, often pale brown and the margin of elevated apothecia dark brown (or vice-versa), sometimes shiny, usually smooth but occasionally rugulose, forming up to 5 cm wide patches. Areoles flat to convex, usually dispersed, sometimes clustered, 0.2-1.5 mm wide, 300-600 μm thick, broadly attached. Epicortex 10-20(-40) μm thick; cortex 25-45(-60) μm thick, of 3-5 μm wide, round to irregularly shaped cells; algal layer 50-100 μm thick, continuous; medulla 100-400 μm thick, of thin-walled, 2-4 μm thick, intricate hyphae. Apothecia 1-5 per areole, 0.2-1 mm across, at first immersed and punctiform, later becoming elevated and with an expanded, rough, sometimes umbonate, dark brown, epruinose disc, the margin formed from the parathecium (sometimes with some algae) with a thin thalline remnant around the base of elevated apothecia. Proper exciple 20-40 μm thick in immersed apothecia, expanding to 50-100 μm in elevated apothecia, IKI-; epithecium brownish, c. 10 μm high; hymenium colourless, 90-120 μm high, the hymenial gel hemiamyloid, K/I+ light blue fading to light red; paraphyses coherent, (1-)1.5(-2) μm thick at mid-level, the apical cells up to 4 μm wide; subhymenium 10-35 μm high, IKI+ blue; hypothecium 10-30 μm high. Asci 100-200-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, narrowly ellipsoid, 3-4(-5) x (1-)1.5(-2.5) μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a pioneer, probably circumboreal species found on granite, sandstone and schist, often occurring in species-poor stands.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Pioneer species

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: very rare

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

J. Kocourková

Lectotype of Lecanora admissa Nyl., leg. J. P. Norrlin (H-Nyl 27455). - Bar: 1 mm