ITALIC 8.0

Placynthium tantaleum (Hepp) Hue

Bull. Soc. Linn. Normandie, sér. 5, 9: 153, 1906. Basionym: Biatora corallinoides var. tantalea Hepp - Flecht. Eur.: nr. 276, 1857.

Synonyms: Placynthium diblastum Gyeln.; Placynthium nigrum var. tantaleum (Hepp) Arnold; Racoblenna tantalea (Hepp) Trevis.

Distribution: N - Piem (TSB 33335).

Description: Thallus crustose, episubstratic, dark olive-brown, dull, granulose to rimose-areolate, forming 2-5 cm wide patches, often delimited by a pale or dark blue to whitish prothallus. Areoles 0.5-1.5 mm thick, 1-1.5(-2) mm wide, usually flat, minutely papillose-lobulate, the papillae 0.1-0.2 mm thick. Upper cortex indistinct or poorly developed and paraplectenchymatous; medulla lacking or very thin; lower cortex of 1-3 rows of more or less isodiametrical, round to angular cells. Apothecia lecideine, immersed to subsessile, 0.3-0.7(-1) mm across, with a concave to slightly convex, smooth, blackish disc and an entire, at first prominent, then often excluded proper margin. Proper exciple dark bluish green, 50-70 µm thick; epithecium bright bluish green; hymenium colourless, 100-110 µm high, amyloid; paraphyses distinctly septate, sparingly branched; hypothecium colourless. Asci 8-spored, apically thickened, with an amyloid cap. Ascospores 1-celled to 1-septate, hyaline, broadly ellipsoid, (9-)10-12(-15) x 5-8 µm. Pycnidia immersed, with a bluish green ostiolar region. Conidia 4-7 x c. 1 µm. Photobiont cyanobacterial, Scytonema-like. Spot tests: all negative. Chemistry: without lichen substances.

Note: on basic siliceous rocks along mountain streams. The epithet has been used for various forms of P. nigrum, and I am not sure that the TSB sample really refers to this lichen, as I did not see the type. Our samples however comply with the description, and have broader, 2-celled spores. Older records, being dubious, are not accepted here.

Growth form: Crustose

Substrata: rocks

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

Reproductive strategy: mainly sexual

Periodically submerged (e.g. in creeks)

Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: extremely rare

Subalpine belt: extremely rare

Oromediterranean belt: absent

Montane belt: very rare

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

Herbarium samples

Index Fungorum GBIF

Felix Schumm – CC BY-SA 4.0

[12285], Griechenland, N-Samos, bei Manolates südlich von Agios Konstandinos, 37°47.185'N, 26°49.533'E, 341 m; halbschattige bis besonnte Terrassenmauern; Glimmerschiefer. Leg. Schumm 02.05.2006, det. Schumm 2006

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

Herbarium: TSB (33335)
2001/12/10

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

Herbarium: TSB (33335)
2001/12/10

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

Herbarium: TSB (33335)
2001/12/10

Felix Schumm – CC BY-SA 4.0

[12285], Griechenland, N-Samos, bei Manolates südlich von Agios Konstandinos, 37°47.185'N, 26°49.533'E, 341 m; halbschattige bis besonnte Terrassenmauern; Glimmerschiefer. Leg. Schumm 02.05.2006, det. Schumm 2006

Felix Schumm – CC BY-SA 4.0

[12285], Griechenland, N-Samos, bei Manolates südlich von Agios Konstandinos, 37°47.185'N, 26°49.533'E, 341 m; halbschattige bis besonnte Terrassenmauern; Glimmerschiefer. Leg. Schumm 02.05.2006, det. Schumm 2006

Felix Schumm – CC BY-SA 4.0

[12285], Griechenland, N-Samos, bei Manolates südlich von Agios Konstandinos, 37°47.185'N, 26°49.533'E, 341 m; halbschattige bis besonnte Terrassenmauern; Glimmerschiefer. Leg. Schumm 02.05.2006, det. Schumm 2006