Seven species of Florideophyceae are reported from the Canary Islands for the first time: Predaea huismanii
Kraft, Platysiphonia caribaea Ballantine et Wynne, Jania longifurca Zanardini, Spermothamnion flabellatum
Bornet, Callithamnion decompositum J. Agardh, Helminthocladia agardhiana Dixon and Rissoella verruculosa
(Bertolini) J. Agardh. Data concerning ecological conditions, geographical distribution, morphology, anatomy
and phenology are presented. Observations on Platysiphonia miniata (C. Agardh) Børgesen which has previously only been reported on from the Canary Islands, are also given.
