Cololejeunea reniformis, a new species from the Wet Tropics of Queensland, Australia (Lejeuneaceae: Marchantiophyta).

Cololejeunea reniformis is described as new based on a single collection from Tully Falls National Park in north-east Queensland. Cololejeunea reniformis is similar to C. cairnsiana in the size and the falcate leaf lobes and ampulliform lobules, which are distinctive features among Australian species. While C. cairnsiana is epiphyllous, the single known gathering of C. reniformis was found on bark, and the two species differ in a number of micromorphological characters. Cololejeunea reniformis differs from C. cairnsiana in having a vitta two or three cells wide, and a stylus two or three cells tall, rather than a vitta 1 cell row wide and a stylus of a single cell. Cololejeunea reniformis shares many micromorphological features with the south-east Asian C. ensifera but differs in its smaller size and falcate leaf lobes, in addition to other characters. Thirty-nine Cololejeunea species are now known for Australia.