Os 
ro be 
ERRATA 
24, line 3 from bottom, omit Cornus canadensis. 
24, line 1 from bottom, for Prunus read Pyrus. 
26, line 7 from bottom, omit Alnus incana. 
27, line 7 from top, for ovata read canadensis. 
210, line 18 from top, for spongioplasm read cytoplasm. 
237, footnote 1, for Ernest read Ernst. 
264, line 18 from top, for Roripa terristris read Roripa terrestris. 
273, line 5 from bottom, for anthers dehiscent read anthers dehiscent 
to but not through the apex. 
330, line 26, for formula read formulae. 
. 395, fig. 3 legend, for gasket read socket. 
