Cetraria aculeata forma

    This form differs from the type by the presence on the entire surface of the branches of very small and very fine spinules which gives them a ciliated or even "isidiated" appearance (appearance of the branches of certain Usnea!). This form is quite common in heather moors, sandy and humid, along the seaside.

Cf. Cetraria ericetorum whose branches are flattened into lobes and canaliculated and whose spinules are marginal.