By S. Segal
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Extra info for Ecological Notes on Wall Vegetation
Facing walls for obvious reasons. In temperate western Europe the best specimens of mural vegetation are found in Ireland, southern England and western France (more particularly Brittany and Normandy and the neighbourin~ old culture regions such as the towns and the castles in the Loire valley). The conditions are not so favourable in the Low Countries on account of the slightly more continental climate. Nevertheless some well-developed examples of wall vegetation occur farther inland in W. Germany and Switzerland in the more subatlantic parts, but they rapidly become rarer towards the East.
Arable land including vineyards. 31 5. Ruderal places including fields lying fallow. 6. Banks, reed vegetation, broads and peat bogs. a. Riparian vegetation. b. Peat bogs and marshes. 7. Grassy sites including meadows, hay-fields, roadsides, dikes, etc. and H ochstauden vegetation. a. Grassy sites. b. chstauden vegetation (generally on peaty soils). 8. Dwarf shrub vegetation, scrubs and forests. a. Heaths, moors, garigues and macchia. b. Scrubs. c. Forests. 9. Vegetation of contact zones and various other cases.
Polychory: dispersal not clearly restricted to only one of the other categories. Other types of dispersal (such as diszoochory) are presumably of little importance among the species occurring in vegetation of walls. The arrangement of the species in the spectra is principally based on the migration spectra. Blastochory, autochory and barochory are only indicated in those rare instances in which these forms of dissemination occur frequently in the biotopes studied. For many species, whose mode of dispersal has not, or at least not unequivocally, been established, the entry is: "dispersal unknown".