Morphology, vegetative and reproductive development of the red alga Portieria hornemannii (Gigartinales: Rhizophyllidaceae)

► Detailed description of the uniaxial growth of Portieria hornemannii and the ontogenies of reproductive structures. ► Rhizophyllidaceae is a monophyletic family. ► Contarinia is resolved as the sister taxon of a clade uniting Nesophila, Ochtodes and Portieria.