(1925)  Includes photo(s).
 
FIG. 173. THE FIVE DIPLOID SPECIES OF ROSA SHOWING DIFFERENTIAL SEPTET CHARACTERS (AA through EE).
EE Species (q through t) R. macrophylla Lindl. (q) Flowers (r) Fruit (s) Habit of Branching (t) Surculus with leaf

(1925)  Page(s) 533.  
 
The sterility of the Old Moss-Rose raises a distinct difficulty in the investigation of the genetics of the "Moss" mutation, as the Single Moss of 1807 seems to be no longer in cultivation, though as we have seen this difficulty is probably not insurmountable.