Ochrolechia microstictoides forma Cf.
This form is characterized by its slightly leprous, almost smooth to slightly warty, whitish thallus, of large size 5-10 cm in its greatest length, coming towards the base of the trunks of trees with smooth bark (Fraxinus especially) of light oceanic forest. This thallus is quickly covered from the center with soralia at first somewhat isidioid, then flat and hollow, containing whitish to greenish soredia; these soralia can sometimes completely cover the thallus. Soralia: C+ yellow, K+/-yellow, KC+ slightly orange yellow, P-, UV-; Thallus: C+/- pale yellow, KC+/- pale yellow, K-, P-, UV-.
N.B. See Ochrolechia turneri a more mountainous species with fewer soralia but which can only be distinguished with certainty by a complete analysis.
N.B. Macroscopically similar to some forms of Lepra albescens but the latter species is C-, K-, KC-, P-.