ITALIC 8.0

Placidium boccanum (Servít) Breuss

Ann. naturhist. Mus. Wien, 98B: 41, 1996. Basionym: Dermatocarpon boccanum Servít - Rozpr. Cesk. Akad. Ved, 65: 23, 1955.

Synonyms: Catapyrenium boccanum (Servít) Breuss

Distribution: N - VG, Ven. C - Tosc, Mol (Nimis & Tretiach 1999, Caporale & al. 2008). S - Si (Caniglia & Grillo 2001, 2006Grillo & Caniglia 2004).

Description: Thallus squamulose, pale to dark brown, the squamules 1.5-4 mm diam., 0.25-0.4 mm thick, closely adpressed, sparse to somehow overlapping, flat to weakly convex, rounded or lobulate, the margins markedly darker than the upper surface. Lower surface black throughout, attached by colourless, 4-6 μm thick rhizohyphae. Upper cortex 50-80 μm thick, paraplectenchymatous, with a 20-50 μm thick epinecral layer; medulla of globular cells; lower cortex weakly differentiated from the medulla, the lower cells strongly pigmented. Perithecia pyriform, up to 0.5 mm across, without involucrellum, immersed in the squamules. Exciple colourless, c. 20 μm thick; paraphyses absent, periphyses 25-35 x 2-3 μm. Asci 8-spored, cylindrical, thin-walled, non-amyloid and without an ocular chamber, 65 80 x 11-15 μm. Ascospores 1-celled, hyaline, uniseriately arranged in the asci, ellipsoid, 12-16 x 5.5-7.5 μm. Pycnidia multilocular, Dermatocarpon-type, black, laminal, immersed, up to 0.4 mm across. Conidia oblong-ellipsoid, 3-4 x 1.5-1.8 μm. Photobiont chlorococcoid (Myrmecia). Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a Mediterranean to mild-temperate lichen growing on calciferous clayey soil, often also found on walls, including those of mortar; rare in Northern Italy, but probably more common in Southern Italy.

Growth form: Squamulose

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

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: 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 27052

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

Herbarium: TSB (27052)
2003/02/13

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

Herbarium: TSB (27052)
2003/02/13