Title: Correspondence
Subjects: Correspondence, Callitriche, Callitrichaceae, Potamogeton, Juncus, Plants, Nomenclature, Isoetaceae, Juncaceae, Location, Lichenologists, Potamogetonaceae
People: J. W. Robbins (1801-1879), Thomas Nuttall (1786-1859), George Engelmann (1809-1884), Edward Tuckerman (1817-1886), Frederick Pursh (1774-1820), Asa Gray (1810-1888), Alexander Braun (1805-1877)