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216 M. J. M. CHRISTENHUSZ Figure 1. Map of the Lesser Antilles, showing the position of the Guadeloupe archipelago. allowing Guadeloupe to harbour a great diversity of vegetation types. Figure 3 shows that the fern diversity in Guadeloupe is most diverse at the mid elevations between 300 and 600 m. This mid-elevation effect has been shown in many mountainous areas. It is obvious in the Lesser Antilles, because the higher elevations are wet, but cool and often more disturbed by strong winds, whereas the lower elevations are often too dry. The optimal area for plants is thus found at mid elevations, where the climate is warm and humid and the forests are well developed. Guadeloupe is positioned at the margin of the Caribbean tectonic plate on the subduction zone with the Atlantic plate. It lies at the point where two island arcs are merging. The older (Eocene) arc stretches from Marie Galante and Grand Terre, northwestward to St Barthélemy and Sombrero Island, where the underlying volcanic base rock is covered by uplifted Pleistocene limestone. The second (younger) arc started taking shape during the Miocene (c. 5 million years ago) and is still volcanically active. In the southern arc, south of Dominica, these island arcs have merged and have subsequently gone through two phases of volcanic orogenesis (Bouysse, <strong>West</strong>ercamp & Andreieff, 1990). The island of Basse Terre consists of seven main eruptive fields, each with a volcanic centre. The Grande Découverte–La Soufrière volcanic complex is the only centre to have been active in the last 10 000 years. The last magmatic eruption occurred c. 560 years ago and culminated in the formation of the current dome of La Soufrière. All historical hydrothermal activity and the explosive eruptions of 1690, 1797–1798, 1812, 1836–1837, 1956 and 1976 have taken place from fractures and vents on this dome (Komorowski et al., 2004). Marie Galante, Petite Terre and Grand Terre are all covered by Pleistocene limestone. La Désirade is formed of Mesozoic and Tertiary rocks and is consequently the oldest island of the archipelago. Lazare et al. (1991) provided an overview of the vegetation types of Guadeloupe and he listed the © 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 161, 213–277
INDEX PTERIDOPHYTORUM GUADALUPENSIUM 217 © 2009 The Linnean Society of London, Botanical Journal of the Linnean Society, 2009, 161, 213–277 Figure 2. Map of the Guadeloupe archipelago with towns and important collection locatilies (Wikipedia Commons, GNU-free documentation licence).
Page 1 and 2: Botanical Journal of the Linnean So
Page 3: Antilles, mostly based on the colle
Page 7 and 8: Figure 4. Bioclimatic zones of Guad
Page 9 and 10: lycopods. Species common in these u
Page 11 and 12: Lycopodium chamaepeuce Herter, Bot.
Page 13 and 14: Habitat: high-elevation savannas, e
Page 15 and 16: Danaea fendleri Underw., Bull. Torr
Page 17 and 18: Habitat: rare epiphytic fern on tre
Page 19 and 20: Material examined: BASSE TERRE: wit
Page 21 and 22: Habitat: uncommon terrestrial speci
Page 23 and 24: Habitat: rare fern of high-elevatio
Page 25 and 26: Feldmann s.n. anno 1936 (P); Col de
Page 27 and 28: are covered by a reflexed margin).
Page 29 and 30: Habitat: locally common terrestrial
Page 31 and 32: Material examined: BASSE TERRE: La
Page 33 and 34: Christenhusz, pers. observ.). GRAND
Page 35 and 36: Martinique, Morne de la Calebasse,
Page 37 and 38: Habitat: locally common, terrestria
Page 39 and 40: Goniopteris tenera Fée, Mém. Fam.
Page 41 and 42: Localities: BASSE TERRE: between Sa
Page 43 and 44: INDEX PTERIDOPHYTORUM GUADALUPENSIU
Page 45 and 46: Valombreuse (M. J. M. Christenhusz,
Page 47 and 48: Locality: Nez Cassé (Vivant, 1996)
Page 49 and 50: Material examined: BASSE TERRE: Tra
Page 51 and 52: Polypodium semicordatum Sw., Prodr.
Page 53 and 54: Material examined: BASSE TERRE: Sof
Page 55 and 56:
257. Enterosora trifurcata (L.) L.E
Page 57 and 58:
Material examined: BASSE TERRE: Mam
Page 59 and 60:
fig. 10. 1712. Typotype: Martinique
Page 61 and 62:
Naturk. 5: 316. 1811. Type: Peru, D
Page 63 and 64:
REFERENCES Alston AHG. 1933. Certai
Page 65:
Vivant J. 1989b. Cryptogames vascul
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