Abstract
Several species of Nupela were found in samples collected in 2009 from streams and aerophytic habitats of North-central Pennsylvania. Some of these species appeared either new to science or insufficiently known and, although described earlier, not yet transferred to the genus Nupela. This triggered an investigation of type materials of several Nupela species described in the past, especially those with type localities in the Appalachian region. As a result of this study, two new Nupela species, N. elegantula and N. frezelii are described, while Navicula pennsylvanica, Navicula poconoensis and Achnanthes subrostrata are transferred to Nupela. Examination of type material of Achnanthes subrostrata var. appalachiana showed that this taxon is conspecific with Nupela lapidosa.
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