The South American species ofDesmarestia(Phaeophyceae)

摘要

The South American species ofDesmarestiaare revised using morphological features of field sporophytes and reproductive and ontogenetic characters obtained from laboratory culture of gametophytes and young sporophytes. Ten entities including a new species are recognized:D.chordalis,D. confervoidescomb.nov.,D.distans,D.firma,D.gayana,D.ligulata,D. muellerisp.nov.,D.patagonica,D.peruviana, andD.tropica. Although the taxa were distinguished in part using features of the life history in culture, most field thalli can be identified using morphological characters. A key to the South American species ofDesmarestiais provided.Key words: culture study,Desmarestia,Desmarestia confervoidescomb.nov.,Desmarestia muellerisp.nov., Phaeophyceae, South America, taxonomy.