CEPHALOZIA CONNIVENS (Dicks.) Dumort, Recueil d' Obs. sur les Jung. 18. 1835.
Jungermannia connivers Dicks. Pl. Crypt. Brit. fasc. 4 : 19. pl. f. 15. 180i.
Cephalozia multi flora Lindb. Acta Soc. Sci. Fenn. 10 : 501. 1875. (not Spruce I. c.) (This species has been frequently reported from America but has been confused with C media. It is likely to occur northward and can be distinguished from that species by its large leaf-cells (66A in diameter) and its perianth formed of a single layer of cells, with long ciliate mouth.) * * * The publication of a revision like the above is often accepted by botanical collectors as an indication that the information re garding the genus is closed. As a fact such a revision merely in dicates the extent of our knowledge for the present and forms a datum line for further study. It also shows or ought to show the limitations of our knowledge. The remarks to follow apply not only to the genus Cephalozia, but to all genera and species of He paticae. Our knowledge of the distribution of species is very much limited. We know next to nothing of the Hepaticas of the en tire range of the Rocky Mountains south of northern Idaho, and Mr. Leiberg and others who have sent in considerable quantities of
interesting plants from farther north have only shown us the stores of information awaiting the collector in that region. Colorado, Utah, the Sierras from Oregon southward, and all the Southwest from Missouri to Texas, New Mexico and Arizona are a great unknown, no less among all of the lower cryptogams than in the Hepaticas. Much more needs to be done throughout all the States of the Mississippi valley, and especially the southern extension of the Appalachian area, which needs the careful atten tion of the resident observer, rather than the hasty notes of the transient collector. It is hoped that the above synopsis and de scriptions will be sufficient to provide for any student of the group the ready means of identifying his material ; we shall be pleased to receive doubtful material, or that illustrating additional facts of distribution.