Pectenia plumbea (Light.) P.M. Jørg., L. Lindblom, Wedin & S. Ekman morpho isidié variant à gros granules isidioïdes.

    Differs from the type by the presence of numerous and large nodules or irregular granules, looking like globose isidia (isidioid or schizidia-like appearance by cortex excrescence, but with irregular and angular surface, distinctive from true isidia) toward the thallus center. All intermediates with plumbea form may be found. At one time it was confused with Degelia atlantica but the latter differs by its longitudinal ribs at lobe margins, smooth and globose isidia on thallus folds at first, expanding to the whole surface, by scarce apothecia (occasionally clustered), immersed in the thallus, by discs flat, chestnut-brown, thin paler exciple and less brighter colours, grey-brownish. In addition, the latter seems more Macaronesian. N.B. This form with large isidioid granules can sometimes show smaller isidioid granules, see Degelia plumbea forme à petits granules isidioides.*