110 P. DIEDERICH & E. SÉRUSIAUX <strong>The</strong> distinction <strong>of</strong> this species from L. dispersa <strong>and</strong> L. umbrina is still poorly understood, <strong>and</strong> some records might be misidentifications. Lit.: Di: 125-126, DSL: 240, Ho: 117, 151, Mü1: 152, NL84: 15. h<strong>and</strong>elii J. Steiner On siliceous rocks rich in heavy metals, mainly found on slate rubbles in disused quarries <strong>and</strong> on railway or road cuttings. B Ard.: RR. L - . F Ard.: RRR. Lit.: L5: 25, NL77: 20, NL97: 50. horiza (Ach.) Linds. Syn.: L. parisiensis Nyl. Corticolous, on Fraxinus, Sorbus <strong>and</strong> Ulmus, mainly on roadside trees. B Fl.: RRR, Mosan: RR. L Lorr.: RRR. Lit.: DG: 33, L7: 86, NL84: 15. hybocarpa (Tuck.) Brodo Corticolous, on old Fraxinus along road. B Mosan: RRR. L - . Lit.: L8, NL84: 15. intricata (Ach.) Ach. On siliceous rocks, usually in rather exposed conditions, either in natural or artificial (slate debris in disused quarries) conditions. B Ard.: R. L - . Lit.: Mü1: 152, NL77: 20, Sé: 138. intumescens (Rebent.) Rabenh. Corticolous, mainly on Fagus <strong>and</strong> Quercus in forest, rarely on Juglans in more open situations. B Ard.: R, Lorr.: RR. L Ard.: R, Lorr.: RR. D Ard.: RRR. Lit.: Di: 126, L5: 25-26, Mü1: 151. muralis (Schreb.) Rabenh. Syn.: L. muralis var. versicolor (Pers.) Tuck., Placodium saxicolum (Pollich) Körb. Saxicolous, on calcareous, natural outcrops in nitrophilous conditions, but most common on walls, ro<strong>of</strong>s <strong>and</strong> concrete, rarely on lignum or at the base <strong>of</strong> trees covered by dust, incl. in highly polluted areas. B CC. L CC. F CC. Lit.: Ca: 105, Di: 127-128, Ho: 154, Qu: 91-92, VGH: 114, Sansen & Deronde (1990). orosthea (Ach.) Ach. Syn.: Lecidea orosthea (Ach.) Ach. On dry, vertical overhangs <strong>of</strong> natural, siliceous outcrops, never found on artificial substrates. B Mosan: RR, Ard.: AR-AC. L Ard.: R, Lorr.: RR. Lit.: La69: 102, Mü4: 109, NL77: 21, NL84: 15, NL92: 155. persimilis (Th. Fr.) Nyl. Corticolous on roadside trees (Fraxinus, Populus, Salix, Tilia), also in forests on Quercus, most common in nitrophilous conditions. B - , most probably overlooked. L Ard.: RRR, Lorr.: AC-AR. Lit.: Di: 129-130. piniperda Körb. Corticolous on Salix, <strong>and</strong> lignicolous on Picea, Populus tremula <strong>and</strong> Sarothamnus. B - . L Ard.: RR, Lorr.: RR. Lit.: Di: 130-131, NL92: 170. polytropa (H<strong>of</strong>fm.) Rabenh. Saxicolous on siliceous rocks, usually in exposed conditions, on natural outcrops or in artificial habitats, incl. walls, debris in disused quarries, railway ballast, etc. B Fl.: RRR, Mosan: RR, Ard.: AR. L Ard.: R, Lorr.: RRR. Lit.: Mü1: 152, NL77: 21, NL92: 170, Zwaenepoel et al. (1994: 37). pruinosa Chaub. Syn.: L. pruinifera Nyl. On vertical surfaces <strong>of</strong> natural, calcareous outcrops in exposed conditions. B Brab.: RRR, Mosan: AR. L - . Lit.: Ertz: 19, L5: 28, La69: 105, NL77: 21, NL84: 15, NL97: 50. pulicaris (Pers.) Ach. Syn.: L. chlarona (Ach.) Nyl., L. coilocarpa (Ach.) Nyl. Corticolous, mainly on the smooth bark <strong>of</strong> Alnus, Fagus <strong>and</strong> Tilia, exceptionally on Fraxinus <strong>and</strong> Quercus, mostly found on branches inside forests. B Mosan: R, Ard.: AR, Lorr.: R. L Ard.: AR, Lorr.: AR. Lit.: Di: 131, La69: 104, Mü1: 151, NL84: 15. rugosella Zahlbr. Corticolous, mainly on roadside trees (Acer, Fraxinus, Populus, Tilia, etc.). B - , most probably overlooked. L Lorr.: AR. Lit.: Di: 131-132. rupicola (L.) Zahlbr. subsp. rupicola Syn.: L. sordida (Pers.) Th. Fr. Saxicolous, on subvertical, siliceous, natural outcrops, rarely on exposed brick walls. B Camp.: RRR, Mosan: RRR, Ard.: AR. L Ard.: RR, Lorr.: RRR. F Mosan: RR. Lit.: La69: 104, Mü1: 151, NL92: 170, Sé: 138.
THE LICHENS OF BELGIUM AND LUXEMBOURG. AN ANNOTATED CHECKLIST 111 rupicola subsp. subplanata (Nyl.) Leuckert & Poelt Syn.: L. subplanata Nyl. On siliceous, natural outcrops, mainly on vertical surfaces. B Ard.: RR. L - . Lit.: Sé: 138. saligna (Schrad.) Zahlbr. Syn.: L. saligna var. sarcopis (Ach.) Hillmann, L. sarcopis (Ach.) Ach., L. effusa (H<strong>of</strong>fm.) Ach. Corticolous <strong>and</strong> lignicolous, most common on Quercus, usually in open situations. B Mar.: RRR, Camp.: RR, Mosan: RR, Ard.: R, Lorr.: R. L Ard.: R, Lorr.: AR. Lit.: Di: 133-134, Mü1: 152, NL84: 15. sambuci (Pers.) Nyl. On the bark <strong>of</strong> a very old Populus along a road. B - . L Lorr.: RRR. Lit.: Di: 134-135, Mü4: 109 (material to be checked). silvae-nigrae V. Wirth On siliceous, natural outcrops <strong>and</strong> scree-covered slope underneath, not found on artificial habitats nearby (e. g. slate pebbles in disused quarries). B Ard.: RRR (but abundant in its single locality). L - . Lit.: Sé: 142. soralifera (Suza) Räsänen Saxicolous on siliceous rocks, usually in exposed conditions, in natural habitats, most common on slate debris in disused quarries near Vielsalm. B Ard.: R. L - . Lit.: NL77: 21, Sé: 138. strobilina (Spreng.) Kieff. Formerly on bark <strong>of</strong> Pinus, recently twice on old Fagus along roads. B Fl.: RRR (†
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