Flora of the cangas of Serra dos Carajás, Pará, Brazil: Isoetaceae

Abstract This study presents taxonomic treatment of the species of Isoetaceae from Serra dos Carajás, Pará, Brazil. Two species occur in this locality (Isoetes cangae and I. serracarajensis). We provide descriptions, illustrations, images of the mega- and microspores, comments, distribution data and a key for these species as a contribution to the knowledge of the flora of the cangas from this area.