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Lichens colonize the more aggressive environments. In this case, R. siliquosa colonize the exposed, hard coastal rocks of a sea cliff where it is exposed to occasional splashing of sea water. It has a fruticose thallus, tufted, erect, with branches flat, strap-like or curved and pointed, often irregular. Their colour ranges from ivory to greenish-grey. It does not present soralia but apothecia are frequent, laminar or marginal. Sometimes many small, immature apothecia and pale pycnidia are scattered over the branch surfaces. Grazing by molluscs may reduce thalli back to the crustose-like holdfasts.
Spotted at exposed, hard coastal rocks, sea cliffs. Asturias
Camera Model: NIKON D500. Exposure Time: 1/800 sec. f/11; ISO Speed Rating: 640. Exposure Bias: 0 EV. Focal Length: 90.0 mm. No flash fired. DSC_3428