Mutations in Horticulture 615 



Ulmus pedunculata. One of the seedlings had 

 cut leaves. He multiplied it by grafting and 

 gave it to the trade under the name of U. 

 pedunculata urticaefolia. It has since been 

 lost. 



Laeiniate alders seem to have been produced 

 by mutation at sundry times. Mirbel says that 

 the Alnus glutinosa laciniata is found wUd in 

 Normandy and in the forests of Montmorency 

 near Paris. A similar variety has been met 

 with in a nursery near Orleans in the year 1855. 

 In connection with this discovery some discus- 

 sion has arisen concerning the question whether 

 it was probable that the Orleans strain was a 

 new mutation, or derived in some way from the 

 trees cited by Mirbel. Of course, as always in 

 such cases, any doubt, once pronounced, affects 

 the importance of the observation for all time, 

 since it is impossible to gather sufficient his- 

 torical evidence to fully decide the point. The 

 same variety had appeared under similar cir- 

 cumstances in a nursery at Lyons previously 

 (1812). 



Laciniated maples are said to be of relatively 

 frequent occurrence in nurseries, among seed- 

 lings of the typical species. Loudon says that 

 once 100 laciniated seedlings were seen to orig- 

 inate from seed of some normal trees. But in 

 this case it is rather probable that the presumed 



