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 (often whitish at the outermost margin) prothallus. Areoles developing on a blue hypothallus, 1-1.5(-2) mm wide, 0.5-1.5 mm thick (the central ones much thicker than the peripheral ones), 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, I+ blue; paraphyses distinctly septate, sparingly branched; hypothecium colourless or brownish. Asci 8-spored, apically thickened, with a distinct amyloid tube structure in the apex. Ascospores(0-)1-septate, slightly constricted at septum, hyaline, broadly ellipsoid, (8-)10-13(-17) x (5-)6-8(-10) µm. Pycnidia immersed, with a bluish green ostiolar region. Conidia bacilliform, 4-8 x c. 1 µm. Photobiont cyanobacterial, Scytonema-like. Spot tests: all negative. Chemistry: without lichen substances. Note: on inundated or persistently wetted calcareous or siliceous rocks and boulders in or along mountain rivers and 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
Predictive model
Herbarium samples
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
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
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
