Placynthium nigrum (Huds.) Gray
Details
Placynthium nigrum (Huds.) Gray, Nat. Arr. Brit. Pl. 1, 395 (1821)
Placynthium nigrum (Huds.) Gray
Biostatus
Nomenclature
(Huds.) Gray
Huds.
Gray
1821
395
ICN
species
Placynthium nigrum
Classification
Synonyms
Descriptions
Placynthium nigrum (Huds.) Gray
Thallus in rosettes, olive to blackish, to 3 cm diam., not effigurate, surrounded by a black, marginal prothallus. Lobes squamulose, flat, 0.4-1.5 mm wide, margins crenate or digitate, squamules scattered at thallus margin, crowded centrally, forming a continuous crust which may become areolate, areolae 1-4 mm wide and 1-3 mm tall. Isidia present or absent, cylindrical, 0.2-0.5 × 0.05-0.1 mm. Lower surface blue-green, rhizinate. Apothecia 1 mm diam., with dark proper margin, disc brown or black, concave at first becoming plane or convex. Ascospores narrow-ellipsoid, 1- to 3-septate, 7-18 × 3.5-7 µm.
Taxonomic concepts
Placynthium nigrum (Huds.) Gray
Placynthium nigrum (Huds.) Gray
Placynthium nigrum (Huds.) Gray
Collections
Metadata
706e4c95-b0c8-4fa2-b401-50123ec831f2
scientific name
Names_Plants
1 January 2000
24 May 2010