Menegazzia subsimilis (H. Magn.) R. Sant.

      Thallus foliose formed of lobes at the ends well applied to the substrate but sometimes more or less erect towards the center of the thallus, shiny surface with numerous small circular or oval perforations, the lobes are provided towards their ends with labriform soralia with a slightly turned up margin , jagged and lacerated, often pierced in their center, the colors are always pale and vary from gray-bluish to pale green (in the shade in a humid environment). Apothecia unknown in our climates. Medulla: C-, K + yellow, KC+ yellow, P + yellow-orange (medulla), UV-. Quite specific habitat on mossy coastal rocks in areas very exposed to sea winds (aerohaline heathlands, whether tree-lined or not), not yet found on the bark of trees in hyperoceanic forests.

     Rare species confused until now with Menegazzia terebrata which can sometimes come in the same habitat but which differs by its darker colors, its habitat on the bark of the trees of the oceanic forests and especially its unperforated globular soralia, but there seem to be embarrassing intermediaries that deserve an in-depth study.

     N.B. Looks like Hypogymnia physodes but the latter does not have a perforated thallus.