@article {dum3384,
	title = {Exotische muurvarens in Belgi{\"e} en Nederland},
	journal = {Dumortiera},
	volume = {92},
	year = {2007},
	pages = {1-16},
	chapter = {1},
	abstract = {Exotic mural ferns in Belgium and the Netherlands. In recent years an increasing number of exotic mural ferns have been recorded in urban areas of Belgium and the Netherlands. Without exception, these plants have escaped from cultivated individuals of which tender taxa bave profited by microclimate and environmental conditions present in larger cities ({\textquoteright}heat islands{\textquoteright}). The present paper deals with recent records of Adiantum capillus-veneris, A. diaphanum and A. raddianum, Cyrtominm falcatum and C, fortunei, Dryopteris cycadina, Polystichum tsus-simense, Pteris cretica s.l. and P. multiflda. Most of these taxa are (very) frost-sensitive and their appearance may be temporary (Cyrtomium falcatum in the Netherlands excepted). Identification keys, photographs, original line drawings and herbarium scans are presented here for most of the escaped species to facilitate identification. In addition, distributional records and ecological comments are provided and reasons why the sudden increase in occurrence of exotic ferns in urban areas discussed.},
	author = {Filip Verloove and Raymond van de Ham and Ton Denters}
}
@article {dum3382,
	title = {Studies in the genus Paspalum (Paniceae, Poaceae) in Europe {\textendash} 2. The Quadrifaria group},
	journal = {Willdenowia},
	volume = {37},
	year = {2007},
	pages = {423-430},
	chapter = {423},
	abstract = {The South American Paspalum quadrifarium has been reported as a naturalized xenophyte in Tuscany and Liguria, Italy, since at least the 1960s. In the present contribution the discovery of the closely related P. exaltatum, also of South American origin, in Liguria, Italy, is reported. These are the only known occurrences in Europe of both species, which are very similar to each other and likely to be confused. In the present paper their diagnostic features are discussed and original line drawings and SEM photographs for both taxa are presented. Their current distribution in Italy is shown and some ecological remarks are added.},
	keywords = {distribution., Italy, Paspalum exaltatum, Paspalum quadrifarium, taxonomy, xenophyte},
	author = {Filip Verloove and Marc Reynders}
}
@article {dum3379,
	title = {La Flore Urbaine de Dunkerque (Nord) : Quelques Xenophytes Remarquables},
	journal = {Le Monde des Plantes},
	volume = {494},
	year = {2007},
	month = {2007},
	pages = {11-14},
	chapter = {11},
	author = {Filip Verloove}
}
