Heterodermia propagulifera (Vain.) J.P. Dey écomorph isidié-sorédié (blastidié). Séquencé.

   Foliaceous thallus of 1-3 cm, formed of lobes little fixed to the substrate, lobes with a summit with a little divided margin in the center of the thallus but very divided and even palmate at the periphery, bluish-green, grayish-green in dry weather, slightly yellowish green in wet weather. The margin and the face of the lobes are covered with globular, whitish, greenish-white isidia-soredia (blastidia?) which can cover the entire surface especially as the thalli are close to the sea and receive projections of sea water. Felted lower surface, not corticated, blackish in the center, whitish elsewhere with sometimes yellow-orange spots towards the margin, presence of simple and scattered rhizines, blackish, lighter at the ends. Sterile taxon. C-, K+ yellow and slowly reddish, KC-, P+ yellow then reddish (coloration more visible on the fresh isidia-soredia than on the cortex and medulla). Very rare taxon coming to the ground on the earth in the heathlands located above the xeric zone in the very exposed cliffs. Comes with other lichens of this habitat: Anaptychia runcinata, Parmotrema crinitum, Cladonia furcata s.l., Cladonia portentosa s.l. etc.

_ The specimens of this taxon presented here were sequenced by Dr. Holger THÜS in Stuttgart and are consistent with the ITS sequence of Heterodermia propagulifera from the Isles of Scilly and Cornwall.