ITALIC 8.0

Lecanora leptacinella Nyl.

in Norrlin, Not. Sällsk. Fauna Fl. Fenn. Förh., Ny Ser. ,13: 330, 1873.

Synonyms:

Distribution: N - TAA (Nascimbene & al. 2021, 2022).

Description: Thallus crustose, episubstratic, inapparent or consisting of more or less scattered, yellowish white, strongly convex, up to 0.5 mm wide areoles developing on moss leaflets. Apothecia usually abundant, lecanorine, scattered to clustered, 0.3-0.7 mm across, broadly sessile or constricted at base, with an initially flat, then slightly convex, pale to dark brown or finally almost black disc, and a thin, smooth, often finally excluded thalline margin. Thalline exciple with relatively few algae, corticate, the cortex 50-75 µm wide in basal parts, consisting of more or less anticlinally oriented, thick-walled hyphae, often inspersed with crystals visible under polarized light, I+ faintly blue; medullary part rather loose, inspersed with crystals; epithecium greenish brown, brown in upper part, K+ greenish, N+ purple, often with crystals dissolving in K and reacting C+ red; hymenium colourless, 50-60 µm high; paraphyses strongly branched, coherent, the apical cells not capitate; hypothecium colourless, up to 70 µm high, I+ blue. Asci 8-spored, clavate, Lecidella-type. Ascospores 1-celled, hyaline, ellipsoid, 7-10 x 4-5 µm. Photobiont chlorococcoid. Spot tests: thallus and apothecial margin K+ yellow, C+ red, KC+ red, P-. Chemistry: alectorialic acid (major), plus traces of barbatic acid.

Note: an arctic-alpine species growing on moribund mosses (Polytrichum, Rhacomitrium, rarely other bryophytes) or on branches of subalpine shrubs (mostly Rhododendron); known from several stations in the Alps, but largely overlooked. For further details see Obermayer & Poelt (1994).

Growth form: Crustose

Substrata: bark, soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare

Subalpine belt: 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

Index Fungorum GBIF

Curtis Randall Björk – CC BY-SA 4.0

Northwest Territories, near MacKay Lake Date: 2011-08-00 On moss in brushy tundra

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste

Herbarium: TSB (13314)
2002/12/12
white thallus with a single apothecium encrusting the leaflets of Polytrichum