136 P. DIEDERICH & E. SÉRUSIAUX B Fl.: RR (†1867), Camp.: RRR (†1869), Brab.: RR (†1899), Mosan: R, Ard.: AR, decreasing, Lorr.: RR. L Ard.: R. Lit.: G<strong>of</strong>finet et al. (1995: 195), Vitikainen (1994: 63). neckeri Müll. Arg. Syn.: P. polydactyla auct. belg. p. p., non (Neck.) H<strong>of</strong>fm. On terricolous mosses, usually in highly mineralized conditions, very rarely at the base <strong>of</strong> ‘dusty’ trees. B Mar.: RR, Fl.: RRR, Brab.: RR (?†1964), Mosan: R, Ard.: RR, Lorr.: RR (1962). L Ard.: RR, Lorr.: RR. Lit.: G<strong>of</strong>finet et al. (1995: 195-196), Vitikainen (1994: 66). neopolydactyla (Gyeln.) Gyeln. On siliceous soil by a road. B Ard.: RRR (†1962). L - . <strong>The</strong> identity <strong>of</strong> the only known collection is not absolutely certain. Now extinct throughout the area <strong>of</strong> study. Lit.: G<strong>of</strong>finet et al. (1995: 196). polydactylon (Neck.) H<strong>of</strong>fm. Note: ‘polydactyla’ is an orthographic variant <strong>of</strong> ‘polydactylon’. In highly different ecological conditions: on mossy rocks in well-lit or shaded conditions, or terricolous in artificial habitats. B Brab.: RRR (†
THE LICHENS OF BELGIUM AND LUXEMBOURG. AN ANNOTATED CHECKLIST 137 PERIDIOTHELIA D. Hawksw. +fuliguncta (Norman) D. Hawksw. Syn.: Microthelia micula auct., non Körb. Corticolous, on Tilia, <strong>of</strong>ten in ruderal conditions. B Mosan: RRR, Ard.: RRR. L Lorr.: RRR. A non-lichenized species, included here because it looks like a lichen <strong>and</strong> is usually studied by lichenologists. Lit.: L7: 88. PERTUSARIA DC. albescens (Huds.) Choisy & Werner Syn.: P. albescens var. corallina (Zahlbr.) J. R. Laundon, P. discoidea (Pers.) Malme, P. globulifera (Turner) A. Massal., P. henrici sensu Erichsen, P. orbiculata (Schreb.) Zahlbr. Corticolous, on roadside trees (mainly Fraxinus <strong>and</strong> Populus), in orchards (on Malus <strong>and</strong> Pyrus) <strong>and</strong> in forests (mainly on Fagus <strong>and</strong> Quercus). B Mar.: R, Fl.: AR, Camp.: AR, Brab.: AC, Mosan: AR, Ard., Lorr.: AC-C. L Ard.: AC, Lorr.: C. One single fertile specimen is known from <strong>Luxembourg</strong>. Lit.: Ca: 114-115, Di: 184-186, DSL: 236-237, Ho: 139, 200, NL84: 16, Hanko (1983: 236). amara (Ach.) Nyl. Syn.: P. faginea auct. Corticolous, on all kinds <strong>of</strong> trees along roads or inside forests, exceptionally saxicolous, on exposed, siliceous rocks. B Camp.: AR, Mosan: AR, Ard., Lorr.: C. L Ard.: CC, Lorr.: C. F Mosan: RRR. Two chemical strains have been observed: with, <strong>and</strong> without protocetraric acid, the latter being the rarest. Lit.: Ba: 10, Di: 186, Mü1: 150, NL84: 16. aspergilla (Ach.) J. R. Laundon Syn.: P. dealbescens auct., non Erichsen, P. dealbata auct., non (Ach.) Nyl. Saxicolous on siliceous rocks, in well-lit, exposed or shaded, natural habitats. B Ard.: AR. L Ard.: RR. Lit.: Di: 183, La69: 104, NL77: 22. coccodes (Ach.) Nyl. Corticolous, in forests (on Fagus <strong>and</strong> Quercus) <strong>and</strong> on roadside trees (e. g. Fraxinus, Tilia). B Fl.: RRR, Brab.: RR, Mosan: R, Ard., Lorr.: AR. L Ard.: AR, Lorr.: AR. Lit.: Di: 187, Ho: 139, 201, 609, La68: 76, NL84: 16, Hanko (1983: 197). corallina (L.) Arnold On siliceous <strong>and</strong> s<strong>and</strong>stone rocks, usually in exposed situations, either in natural habitats or on slate debris in disused quarries. B Ard.: AR. L Ard.: R, Lorr.: AR. Lit.: Di: 183, La68: 76, Mü1: 150, NL92: 172. coronata (Ach.) Th. Fr. On bark <strong>of</strong> Fagus, Fraxinus <strong>and</strong> Quercus in wellpreserved forests. B Ard.: RRR, Lorr.: RRR. L Lorr.: RR. Lit.: Di: 187-188, L5: 34. excludens Nyl. On a rather shaded, siliceous, natural outcrop. B Ard.: RRR. L - . Lit.: L5: 19, 34. flavida (DC.) J. R. Laundon Syn.: P. lutescens (H<strong>of</strong>fm.) Lamy Corticolous, mostly on old Fagus <strong>and</strong> Quercus inside well-preserved forests, also on roadside trees (Fraxinus, Tilia, Ulmus), exceptionally lignicolous. B Mosan: R, Ard.: AR, Lorr.: R. L Ard.: AC, Lorr.: AC (but absent in the industrialized SW part). Lit.: Di: 188, Mü1: 150, NL84: 16. hemisphaerica (Flörke) Erichsen Corticolous, mainly on Fagus <strong>and</strong> Quercus inside forests. B Mosan: R, Ard.: AR, Lorr.: R. L Ard.: AC, Lorr.: C. Lit.: Di: 188-189, La68: 76, NL84: 16. hymenea (Ach.) Schaer. Syn.: P. wulfenii DC. Corticolous, mainly in forests on old trees <strong>of</strong> Fagus <strong>and</strong> Quercus, rarely on Acer. B Mosan: RRR, Ard.: RR, Lorr.: RR. L Ard.: RR, Lorr.: R. Lit.: Di: 189-190, NL97: 53. lactea (L.) Arnold On exposed <strong>and</strong> well-lit, siliceous rocks in natural habitats. B Mosan: RR, Ard.: R. L Ard.: R. Lit.: La68: 76, Mü1: 150, NL77: 22, NL92: 172. leioplaca DC. Syn.: P. leucostoma A. Massal. On the smooth bark <strong>of</strong> Carpinus <strong>and</strong> other trees in shaded forests.
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