Notes on Pneumatopteris (Thelypteridaceae) from Papua New Guinea, with the description of a new calciphilous species

Pneumatopteris medlerii from the Conservation International Kaijende Highlands Expedition is described. The novelty is closest to P. caudata, differing primarily in the short-creeping rhizome, stipitate pinnae, medial sori, glabrous indusia, and the occurrence on limestone. Noteworthy records for P. petrophila and P. nephrolepioides are also reported with the new species