Abstract
The genus Orthotrichia was last reviewed in 1961 by Kingsolver & Ross, but drawings of the males were primarily restricted to ventral views, and females of only one species was included. The six species comprising the genus in North America are all known from Florida and extensive collecting throughout the state has allowed us to associate the females with the males. With this paper, we provide new drawings and keys of the males and females of the Orthotrichia in Florida, which should be applicable to all of North America, and describe the females of O. curta Kingsolver & Ross, O. dentata Kingsolver & Ross, and O. instabilis Denning.