why the name limosum should be now disturbed. The surface 
of the stem is peculiarly smooth in all my specimens. 
Plate 62 . Two forms of the plant—one with branches, the other unbranched— 
of JEquisetum (§ Hyemalia) limosum, Linn., are represented ,—natural size. Eig. 1. 
Section of the stem. 2. Section of a branch :— magnified. 
