. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 438 A. Machado. in a stepwise fashion (more earth accumulated) but still very steep (>100 %). This face is open to humid northerly wind arriving from the sea, an effect shown by the presence of some epilythic bryophytes and the more hygrophylic lichens which dominate there: Ramalina bourgeana Nyl. Rocella fusiformis (L.) DC. and Rocella tuberculata ' Major vegetation in the lizard's habitat corresponds to a reduced version of the cliff's flora, due to a le
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 438 A. Machado. in a stepwise fashion (more earth accumulated) but still very steep (>100 %). This face is open to humid northerly wind arriving from the sea, an effect shown by the presence of some epilythic bryophytes and the more hygrophylic lichens which dominate there: Ramalina bourgeana Nyl. Rocella fusiformis (L.) DC. and Rocella tuberculata ' Major vegetation in the lizard's habitat corresponds to a reduced version of the cliff's flora, due to a lesser soil availability, abundance of rocks and crevices and a warmer and more xeric microclimate. Dominance is achieved by xerophytic succulents like Kleinia neriifolia Haw. and Euphorbia obtusifolia regis-jubae (Webb. & Berth.), and woody shrubs: Echium hiérrense Webb ex Bolle, Lavandula canadensis Mill, and Artemisia thuscula Cav. Micromeria sp. chaemophytes are very inconspicuous, but rather common throughout. Crevices are mostly occupied by Carlina salicifolia (L. fil.) Cav., browsed Psoralea bituminosa L., Aeonium hiérrense (Murr.) Pit. et Pr., Aeonium longythirsum (Burch.) Svent and Phyllis viscosa Webb ex Christ. Less common are Globularia salicina Lam., Rumex lunaria L., Schizogyne sericea (L. fil) DC, Paronychia canadensis (L. fil) Juss., Periploca laevigata Ait., Rubia fruticosa Ait. and Erica arbórea L. Attached to rocks and in small gaps I frequently saw dried Wahlenbergia I. lobelioides (L. fil.) A. DC. and some individuals of Cheilantes catanensis (Cos.) H. P. Fuchs, Lobulada sp. and Polycapaea cf. divaricata (Ait.) Poir, but the majority of the smaller plants belong to the gramineae. Most abundant throughout were Trachynia distachya (Hasselq. ex. L.), Vulpia sp., Hyparrhenia hirta (L.) Stapf, and Brachypodium cf. arbuscula, which is the only grass that remains green in summer. Therophytic vegetation which should start to develop in September with the arri
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