The Dumontieae, a resurrected tribe of red algae (Dumontiaceae, Rhodophyta)

Abstract

Abstract Several monophyletic groups of taxa were produced by a cladistic analysis of all species belonging to the red algal family Dumontiaceae (Gigartinales). One of these groups is recognized here as the tribe Dumontieae. It consists of the species of Dumontia, Crypto siphonia, Hyalosiphonia, Masudaphycus gen. nov., Neodilsea, and Dilsea, all found in the North Pacific with some spillover into the North Atlantic. Dasyphloea insignis, the only species of an endemic, southern Australian genus, is included in the Dumontieae with reservation. An explicit hypothesis of phylogenetic relationships, based mostly on morphological features, is presented for all species of the Dumontieae. The primitive condition in the tribe is hypothesized to be a relatively short carpogonial branch (no more than 11 cells long), an anticlinal–periclinal pattern of division of periaxial branches, an alternation of isomorphic generations, a lateral trichogyne, the carpogonium not always dividing after fertilization, relatively lar...