Monogr. Brit. Lich. 1: 172 (1918) "Grey-Weathers
Basionym: Lichen siliquosus Huds., Flor. Angl.: 460 (1762).
Type: United Kingdom, England, Region South-West, Devon, [historic county Wiltshire], Grey Wethers, ca. 100 m, date unknown (OXF - lectotypified by Krog & James 1977: xx).
Thallus: erect or rarely subpendulous, caespitose, 1.5 - 3 - 8 cm long, growing from a common holdfast. Branches solid, yellowish green, simple or sparingly branched, 1 - 3 - 5 mm wide, dorsiventral or terete, dorsiventral branches flattened or more or less slightly canaliculate, mat or subnitid, surface smooth or uneven, irregularly ridged by protruded pycnidia, rarely foveolate. Pseudocyphellae ellipsoid or orbicular, often with slit or tiny crackes near the center, laminal or marginal, sparse or rarely very conspicuous especially towards the base. Thallus 300 - 800 - 1000 µm thick; cortex indistincty, ca. 10 µm thick; chondroid tissue continuous or dissected by pseudocyphellae, often penetrating into the medulla, clearly to moderately cracked, 50 - 180 - 300 µm thick. Apothecia common, subterminal, submarginal or laminal, lateral on terete branches; disc flat becoming convex with age; thalline exciple entire, pseudocyphellate; hymenium 60 - 65 µm high; hypothecium 30 - 40 µm thick; proper exciple 50 - 100 µm thick; chondroid tissue of thalloid exciple conspicuous, often connected with proper exciple; ascospores colorless, short fusiform, 2-celled, with or without additional septa, 10 - 12 / 4 - 5 µm. Pycnidia common, pale colored (Kashiwadani 1992: 64).
Photobiont: Green alga.
Chemistry:
Ecology: Saxicolous, at seaside.
Molecular data: Genbank
Distribution: Japan, USA, Europe. Woher kommt das ? Die Art wird in der Esslinger-Liste nicht genannt.
Note:
Race I: Usnic acid, salazinic acid (Hamada 1984: 96, Kashiwadani 1992: 64). "The content of the medullary depsidone salazinic acid is dependent upon the temperature of the habitat" (Hamada 1984: 98).
Race II: Usnic acid, protocetraric acid (Kashiwadani 1992: 64)
Race II: Usnic acid (Kashiwadani 1992: 64)