On Amphilophocolea Schust. and Cyanolophocolea (Schust.) Schust., new Austral genera of Lophocoleoideae (Geocalycaceae)
Schuster, Rudolf M.
Geocalycaceae are divided into two subfamilies, Lophocoleoideae, in which lateral branching (mostly terminal + also intercalary) is preserved, and a subfamily Geocalycoideae, in which lateral-intercalary branching is lost (and terminal-lateral branches are almost always lost); branching is normally only ventral-intercalary. The monotypic genus Amphilophocolea (with only A. sciaphila) is described; it is like Lophocoleoideae in leafform and orientation and underleaves, but like Geocalycoideae in the uniformly ventral-intercalary branching. This genus has a dorsal "leaffree" continuous band of cortical cells, 2-3 cells broad. The inability to form lateral-intercalary branching in Amphilophocolea is shared with Cyanolophocolea, a genus unique in Geocalycaceae in having deep blue oil-bodies. In this genus the "leaf-free" dorsal strip of cortex is 3-5 cells broad. Other Lophocoleoideae, in general, have leaf insertions antically attaining the stem midline. Antical leaf bases in many taxa are even connate. It is assumed that malleable branching, involving ventral-intercalary branching + lateral-intercalary branching + lateral-terminal (Frullania-type) branching is the generalized character-state in the Geocalycaceae as a whole. Cyanolophocolea is derivative in the loss of lateral-intercalary branching. Amphilophocolea is even more derivative, having lost both types of lateral branching.