Cladonia rangiformis Hoffm.
Primary thallus made of small basal squamules, rare, vanishing soon and sometimes absent, upper surface grey-greenish, whitish below. Podetia forming tufts up to 5-7 cm tall, often isolate, hemispherical, hedgehog-like, densely branched with acute angles, terminal ramification mainly bifid, sometimes trifid, pointed apices, surface typically marbled with grey-green to green spots on pale grey-cream background (snake skin or giraffe skin like), possibly squamulose. Apothecia very rare, small like pin's head, corymbose at branchlet apices, brown. Photobiont : trebouxioide. C-, K+ yellow, Pd+ red (30 %) or Pd- (70 %) (usually Pd- in our prospection area), sweet taste. Coastal species (in Brittany), on calcified dunes, seldom inland. Specimen exposed to sun turning brown may not be confused with Cladonia furcata K-, darker, less marbled and bitter.*