LEJEUNIA - Lichens of Belgium, Luxembourg and northern France

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NE des “Châlets d’Iraty”, 1200-1300 m, futaie de hêtres, 7.1989, P. W. James, F. Rose,
J. Vivant & E. Sérusiaux s. n. (LG).
Germany: Bez. Nordhessen, grossflächig an senkrechten, teilschattigen, feuchtgetönten
grobkörnigen Basalttuffwänden im Parmelietum omphalodis, 500 m, Felsabbrüche
zwischen Dörnberg und Helfensteinen im Naturpark Habitchtwald westlich Kessel,
4.1972, G. Follmann Lichenes Exsiccati selecti a Museo Historiae Naturalis Casselensis
editi n° 308 (LG, hb Diederich).
Greece: Thessaly, Litochoron, Olympus, Stavros, 1000 m, on Pinus, 8.1984, P. van den
Boom 2083 (h); ibid., Mt Olympus, 2100 m, on Pinus, 7.1984, P. van den Boom 1944;
chaîne du Pinde, route de Kalambaka à Ioannina, 28 km avant Metsovon, 15 km avant
le col, 1500 m, bois de pin, sur tronc, 8.1962, V. Demoulin (LG).
Slovenia: Alpes Juliennes, Bohinj, sur Larix en bord de route, 6.1960, J. L. Ramaut
s. n. (LG).
Algeria: Mt Babor, sur cèdre, 9.1981, J. P. Ledant s. n. (LG).
Spain, Canary Isles: Tenerife, route La Esperanza-Las Cañadas, La Crucita, crête
venteuse, 1970 m, blocs de lave, 4.1972, J. R. De Sloover 72L108 (LG); Tenerife, route
Aquamansa-El Portillo, barranco recoupé par la route, 1680 m, sur sol meuble entre les
rochers, 3.1972, J. R. De Sloover 72L16 (LG).
This species was recently described from Germany (FEUERER & THELL,
2002) and has subsequently also been discovered in southern Sweden (THELL,
2003). It is very similar to Parmelia saxatilis, but mainly differs in the strongly
pruinose upper thallus surface (sometimes epruinose near the margin) and
isidia. From the original description, it seems obvious that Parmelia saxatilis
var. retiruga f. pruinosa Lynge [in Bergens Museums Aarbog 9: 91, 1910]
represents the same taxon. There might be a sorediate counter-part in P. sulcata
as Harmand (Lich. de France 4: 567, 1909) has described var. pruinosa Harm.
within that species with the following description: “Thalle blanchâtre ou
blanc-grisâtre recouvert d’une pruine farineuse …”. Indeed, the collections of
P. sulcata in LG and hb Diederich hold several specimens which match that
description. It seems clear to us that detailed DNA analysis of such sibbling
taxa should provide reliable data to assess their taxonomic value.
We report P. ernstiae here as new for the study area, where it appears to be
widespread although much rarer than P. saxatilis, for France, Greece, Slovenia,
Algeria and the Canary Isles.
Peltigera extenuata (Vain.) Lojka
Belgium, Lorr.: Buzenol, bord de la voie ferrée près de la gare (M7.14), 8.1965, J.
Lambinon 65/671 (LG).
Luxembourg, Lorr.: s. loc., vers 1840, F.-A. Tinant 80 (LUX); Pétange, Prënzebierg (M8.31),
9.1966, J. Lambinon 67/1360 (LG); Mensdorf, Widdebierg, carrière (L9.51), sur un rocher
en grès, 8.1982, P. Diederich 3606 (h); entre Dudelange et Kayl, Haard (M8.54), sur de la
terre, 7.2002, J. Miadlikowska, P. Diederich 15486 (h) & D. Ertz 2512 (BR).