ITALIC 7.0

Placidium tenellum (Breuss) Breuss

Ann. naturhist. Mus. Wien, 98B: 41, 1996. Basionym: Catapyrenium tenellum Breuss - Stapfia, 23: 126, 1990.

Synonyms:

Distribution: S - Si.

Description: Thallus squamulose, the squamules 0.7-2(-3.5) mm broad, 0.2-0.4 mm thick, medium to dark brown, dull, epruinose, mostly rounded at least when young, flattened, smooth, scattered to contiguous. Lower surface pale, but often darkening especially in central parts, attached by 3-4.5(-5) μm thick, colourless rhizohyphae. Upper cortex 45-100 μm thick, paraplectenchymatous, of 8-15 μm wide cells, with an up to 40 μm thick epinecral layer; medulla of globular cells; lower cortex poorly differentiated from the medulla, of 7-12 μm wide cells. Perithecia frequent, laminal, pyriform, up to 0.5 mm wide, immersed in the squamules, without involucrellum. Exciple pale throughout; paraphyses absent, substituted by periphyses; hymenium K/I+ blue. Asci 8-spored, cylindrical, thin-walled, non-amyloid and without an ocular chamber. Ascospores 1-celled, hyaline, ellipsoid, thin-walled, uniseriately arranged, 11-15 x 5-7.5 μm. Pycnidia black, laminal, immersed. Conidia ellipsoid to subcylindrical, 3-4 x 1.5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a widespread but rare species of dry, very open Mediterranean grasslands and garrigues on calcareous substrata, extending eastward to Mongolia.

Growth form: Squamulose

Substrata: 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: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

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

Jennifer Fiorentino

Malta, Maltese Islands, dry mediterranean steppe,

Jennifer Fiorentino

Malta, Maltese Islands, dry mediterranean steppe,

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

Herbarium: TSB (31323)
2001/11/22

Jennifer Fiorentino

Malta, Maltese Islands, dry mediterranean steppe,

Jennifer Fiorentino

Malta, Maltese Islands, dry mediterranean steppe,

Jennifer Fiorentino

Malta, Maltese Islands, dry mediterranean steppe,