Leucodermia leucomelos forme sorédiée. = Heterodermia leucomela forme sorédiée.

     This taxon is characterized by the presence of whitish, granular soredia on the underside of the strips, particularly at their apex. This very rare form occurs on the ground at the foot of siliceous rocks in areas highly exposed to wind and sea spray on the capes and points of Finistère.

N.B. Not to be confused with Physcia tenella, which is generally fertile.