Heterodermia neglecta R.C. Harris & E.A. Tripp. = Polyblastidium neglectum (Lendemer) R.C. Harris & E.A. Tripp.

    Foliose thallus, not very attached to the support, made up of elongated lobes, very jagged and branched, flat, 1-3 mm wide, bearing at their ends labriform marginal soralia, whitish and mealy, smooth and shiny upper surface, greenish in humid weather, very pale gray to glaucous in dry weather, underside corticate, smooth with some black rhizines, blackish in the center, ochraceous white at the periphery. Apothecia unknown in our climates. Medulla: C-, K+ yellow then red, KC+/- yellow to red, Pd+ yellow becoming reddish. Corticolous species growing on the large branches of trees (Quercus, etc.) in humid and windy oceanic forests.

N.B. Heterodermia subneglectum occurs in coastal heaths and is Pd-.

N.B. Provisional identification and awaiting clarification because the genus Heterodermia is heterogeneous and the characters used for identifications are unreliable because they are quantitative and variable depending on the authors...