Anatomy and Classification of the Mesophyllaceae (Corallinales, Rhodophyta), Based on Phylogenetic Principles

<p dir="ltr">A phylogenetic analysis based on parsimony and outgroup comparison indicates that the Mesophyllaceae comprise the Clathromorphoideae subfam. nov., the Protomesophylloideae subfam. nov., and the Mesophylloideae. The latter subfamily includes the main core of species previously assigned to <i>Mesophyllum </i>and <i>Leptophytum</i>. The Clathromorphoideae comprise the genera <i>Clathromorphum</i>, <i>Neopolyporolithon</i>, <i>Callilithophytum</i>, and the monotypic <i>Clathmoroa </i>gen. nov. based on <i>C. tubiformis</i> comb. nov. from South Africa. Protomesophylloideae is monotypic, based on <i>Protomesophyllum </i><i>ameleteton</i> sp. nov. from southern Australia-New Zealand-Chatham. Within the Mesophylloideae, three tribes are recognized: Amphithallieae trib. nov., Melyvonneeae trib. nov., and Magnephyceae trib. nov.</p>