Lichens of Belgium, Luxembourg and northern France
Physcia subalbinea Nyl. |
Syn.: P. wainioi Räsänen, P. caesiella (B. de Lesd.) Suza
On natural, exposed, siliceous outcrops and on artificial substrates (mainly old walls), rarely corticolous on roadside trees (Fraxinus).
Belgium: Mosan: RR (†1929), Ard.: R.
Luxembourg: Ard.: R.
France: Mosan: RRR.
Lit.: La66: 475-476, WS: 50, 100.