The following five species of microscopic tuft-forming/encrusting brown alg
ae (Phaeophyta) are newly recorded for the Island of Sao Miguel (Azores): N
emoderma tingitana Schousboe ex Bornet, Pseudolithoderma roscoffense Loisea
ux (Lithodermataceae), Hecatonema terminalis (Kutzing) Kylin (Punctariaceae
), Compsonema saxicolum (Kuckuck) Kuckuck, and Microspongium gelatinosum Re
inke (Scytosiphonaceae). The species are described, and information is pres
ented on their ecology and distribution around the island.