ITALIC 8.0

Peltula placodizans (Zahlbr.) Wetmore

Ann. Missouri Bot. Gard., 57: 196, 1970. Basionym: Heppia placodizans Zahlbr. - Bull. Torrey Bot. Cl., 35: 299, 1908.

Synonyms: Endocarpiscum placodizans (Zahlbr.) Fink

Distribution: N - TAA. C - Sar.

Description: Thallus crustose-placodioid to subfoliose, areolate in central parts, lobed at margins. Central areoles rounded, flat or convex, 0.1-0.5 mm in diam., with blackish, laminal, capitate soralia bearing farinose soredia; marginal lobes simple to slightly branched, to 1.3 mm long, 0.2-0.5 mm wide, brownish to olive-green; lower surface paler than upper surface. Upper cortex not developed, but upper surface with a yellowish epinecral layer; medulla of loosely interwoven hyphae with globose cells and numerous air spaces; lower cortex poorly developed, paraplectenchymatous with globose cells. Apothecia very rare, 0.1-0.3 mm across, usually 1 per squamule, immersed, with a punctiform, yellowish brown to blackish brown disc, and a poorly evident thalline margin. Epithecium yellowish brown, K+ red-violet or K-; hymenium colourless, I+ wine-red. Asci >60-spored, clavate to obclavate, rostrate, the wall I+ orange, K/I+ blue. Ascospores 1-celled, globose to ellipsoid, (3-)4.5-8 x 3-5 µm. Pycnidia: immersed, cerebriform. Conidia fusiform, c. 3.5 x 1.5 µm. Photobiont cyanobacterial, chroococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on steeply inclined seepage tracks of basic siliceous rocks, both in the Mediterranean belt and in warm-dry Alpine valleys.

Growth form: Crustose placodiomorph

Substrata: rocks

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

Reproductive strategy: mainly sexual

On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: extremely rare

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

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

P.L. Nimis CC BY-SA 04

TSB 17553

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

Herbarium: TSB (17553)
2003/03/12