A revision of the fern family Cyatheaceae in the Mascarene Islands Thomas JANSSEN Muséum national d’Histoire naturelle, Département Systématique et Évolution, UMR-CNRS 5202, USM 0602, case postale 39, 57 rue Cuvier, F-75231 Paris cedex 05 (France) and Georg-August-Universität Göttingen, Albrecht-von-Haller-Institut für Pfl anzenwissenschaften, Abt. Spezielle Botanik, Untere Karspüle 2, D-37073 Göttingen (Germany)
[email protected] France RAKOTONDRAINIBE École pratique des hautes Études et Muséum national d’Histoire naturelle, Département Systématique et Évolution, UMR-CNRS 5202, USM 0602, case postale 39, 57 rue Cuvier, F-75231 Paris cedex 05 (France)
[email protected] Janssen T. & Rakotondrainibe F. 2006. — A revision of the fern family Cyatheaceae in the Mascarene Islands. Adansonia, sér. 3, 28 (2) : 213-241. ABSTRACT Based on the examination of herbarium specimens including numerous recent collections and on observations of the species in situ, we herein present a revi- sion of the tree fern family Cyatheaceae for the Mascarene Islands. Th ree taxa are accepted for Réunion, two of which are endemic to the island. Four taxa, including one endemic species and two endemic varieties, are recognized for Mauritius. One introduced species is present on both islands. We describe one new species, Cyathea grangaudiana Th .Janssen & Rakotondr. and one new va- riety, Cyathea borbonica Desv. var. sevathiana Th .Janssen & Rakotondr. from Mauritius. Cyathea grangaudiana has a pinnate-pinnatisect lamina, scattered acicular hairs on the abaxial face of the costules and sporangiasters on the re- ceptacle. Cyathea borbonica var. sevathiana has erect leaves, a bipinnate lamina with conduplicate pinnae and pinnules as well as smaller and more coriaceous KEY WORDS Cyatheaceae, pinnules than the type variety.