ITALIC 8.0

Placynthium lismorense (Cromb.) Vain.

Ark. Bot., 8, 4: 98, 1909. Basionym: Pterygium lismorense Cromb. - Grevillea, 5: 108, 1877.

Synonyms:

Distribution: C - Abr (Nimis & Tretiach 1999), Mol (Nimis & Tretiach 1999, Caporale & al. 2008). S - Camp (Aprile & al. 2003b), Si (Nimis & al. 1994).

Description: Thallus crustose-placodioid, firmly attached, olivaceous brown to brown-black, epruinose, forming up to 3 cm wide, irregular rosettes or convex pillows, without a visible prothallus. Central part of thallus covered in dense, granulose isidia-like outgrowths eventually eroding and leaving crescent-formed thalli; marginal lobes radiating, flattened, up to 1 mm long and c. 0.5 mm wide, 75-105 μm thick, finely divided into narrow, digitate segments. Apothecia rather frequent, lecideine, up to 1 mm across, with a flat to finally convex, black disc and a distinct proper margin. Hymenium I+ blue. Asci 8-spored, apically thickened, with an amyloid cap. Ascospores 1-septate, hyaline, slightly curved, broadly ellipsoid, 9-11(-13) x 5-6 μm. Photobiont cyanobacterial, Scytonema-like. Spot tests: all negative. Chemistry: without lichen substances.

Note: on more or less calcareous rocks along seepage tracks at relatively low elevations. According to Jørgensen (2007) this species appears to be restricted to the western coasts of France, the British Isles and Scandinavia, but it was later confirmed from inland localities of Central Europe and the Iberian Peninsula (Burgaz 2010, Czeika & Czeika 2007).

Growth form: Crustose

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

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: absent

Humid mediterranean belt: very 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

Index Fungorum GBIF

Curtis Randall Björk – CC BY-SA 4.0

British Columbia, Vancouver Island, near Ucluelet Date: 2009-09-07 On limestone rocks shortly above high tide line

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

Herbarium: TSB (30603)
2003/03/12