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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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Acknowledgements
The use of the Centralized Research Facilities, Drexel University, for the SEM is gratefully acknowledged. I am thankful to Friedel Hintz for sending type materials from the Hustedt's Collection, Bremerhaven and to Mihaela Enache, Kalina Manoylov, Eduardo Morales, Sarah Hamsher, Diane Winter, Lont Marr, Loren Bahls, and Todd Clason whose records of Nupela species from ANSP databases were used to search for materials for this project. I also thank Rex Lowe for a helpful discussion on the identity of Achnanthes subrostrata var appalachiana and Jennifer Beals for technical assistance. This study was supported by the grant WRCP-08286 of the Pennsylvania Department of Conservation and Natural Resources and DBI-0840406 from the National Science Foundation.