A new Riccardia (Aneuraceae, Marchantiophyta) from Myanmar

Abstract

A new species of Riccardia, R. meagheri, is described from mountainous areas of northern Myanmar. The new species differs from other species by 1) inner cells of main axis and branches in thallus cross-section flattened, much wider than high, irregularly shaped and with curved cell walls, 2) dorsal epidermis cells mamillose protruding forwards, ventral epidermal cells enlarged, but externally flat, not mamillose, 3) a winged, translucent, single-layered margin on both the main axis and branches, 4) the identical structure of the main axis and branches in thallus cross-section.