The Lichens and Lichenicolous Fungi of Belgium and Luxembourg ...

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12 P. DIEDERICH & E. SÉRUSIAUX Fig. 2. The area of study and the phytogeographical districts. Le territoire étudié et les districts phytogéographiques. Het onderzoeksgebied en de fytogeografische districten. The Maritime district (here after Mar.) is a coastal plain, very strongly urbanized and industrialized. The relative mildness of the climate, occurrence of sea sprays and relatively strong winds are decisive factors for the lichen flora. A few sandy dunes still remain; when they are not trampled too much, depressions of more or less stabilized sand (the so-called ‘pannes sèches’) are colonized by carpets of mosses and lichens, dominated by calcicolous or siliceous species, depending on sand acidity (Fig. 3). Bushes that eventually colonize these depressions provide a suitable habitat for several epiphytic species. Although often impoverished, the epiphytic flora is mostly present on isolated trees along canals and roads, as well as around farms (Fig. 4). Indeed, air pollution is still strong and clearly affects the lichen flora. The district has no natural rock but buildings and especially sea walls provide a substrate for several saxicolous species.
THE LICHENS OF BELGIUM AND LUXEMBOURG. AN ANNOTATED CHECKLIST 13 Fig. 3. Dunes with Pinus sylvestris and a rich terricolous cryptogamic vegetation in the Maritime district (Ghyvelde, dept. Nord, France). Reproduced from Bouly de Lesdain (1910a). Dunes avec Pinus sylvestris et une riche végétation cryptogamique terricole dans le district maritime (Ghyvelde, dépt. Nord, France). Reproduit de Bouly de Lesdain (1910a). Duinen met Pinus sylvestris en een rijke terrestrische vegetatie met cryptogamen in het Maritiem district (Ghyvelde, dept. Nord, France). Overgenomen van Bouly de Lesdain (1910a). Fig. 4. Stereophoto of Ramalina lacera, a species now extinct in the study area, and Diploicia canescens on Populus near Koksijde in 1909. Reproduced from Massart (1910, phot. 281). Stéréophoto de Ramalina lacera, une espèce disparue du territoire étudié, et Diploicia canescens sur Populus près de Koksijde en 1909. Reproduit de Massart (1910, phot. 281). Stereofoto van Ramalina lacera, een soort die inmiddels is verdwenen uit het onderzoeksgebied. Samen met Diploicia canescens op een Populus bij Koksijde in 1909. Overgenomen van Massart (1910, foto 281).
Page 1 and 2: The Lichens and Lichenicolous Fungi
Page 3 and 4: The Lichens and Lichenicolous Fungi
Page 5 and 6: Contents Introduction .............
Page 7 and 8: L THE LICHENS OF BELGIUM AND LUXEMB
Page 9 and 10: THE LICHENS OF BELGIUM AND LUXEMBOU
Page 11: T THE LICHENS OF BELGIUM AND LUXEMB
Page 25 and 26: H THE LICHENS OF BELGIUM AND LUXEMB
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Page 41 and 42: Species included THE LICHENS OF BEL
Page 49 and 50: Nomenclatuur THE LICHENS OF BELGIUM
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THE LICHENS OF BELGIUM AND LUXEMBOU
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BOTRYDINA Bréb. THE LICHENS OF BEL
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CONIDA A. Massal. THE LICHENS OF BE
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EPILICHEN Clem. THE LICHENS OF BELG
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LEPTORHAPHIS Körb. THE LICHENS OF
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PHYSALOSPORA Niessl THE LICHENS OF
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SPILONEMA Bornet THE LICHENS OF BEL
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THYREA A. Massal. THE LICHENS OF BE
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Eopyrenula R. C. Harris grandicula
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