182 Fernald— Relationships of some American 
In Asia as in northwestern America the abundance of resin 
on the branchlets seems to vary without any accompanying 
change in leaf-outline or other character perceptible in the 
specimens ; and by comparison with well authenticated Asian 
specimens of Betula verrucosa, Ehrh. (B. pendula, Roth), B. 
mandshurica, Regel, and B. latifolia (B. japonica) with its 
vars. Tauschii and kamtschatica, essentially all the available 
material of the American 2. kenaica (including B. alaskana) 
can be exactly matched. Thus such specimens as Coville and 
Kearney’s Nos. 1,408, 1,422, and 2,425 of B. kenaica (Nos. 
373,608, 373,609, 373,622, U. S. Nat. Herb.) and an old sheet 
in the National Herbarium from Fort Simpson (Mackenzie 
District) are good matches for Japanese material collected by 
aximowicz and distributed as B. alba, subsp. latifolia « 
0. 25,341 in the U at. Herb.). These specimens also 
match too closely the original description and figure of var 
Tauschii, Rege urther material ar. Zauschii col- 
bare (No. 12,952a) and McConnell’s Dawson specimen 
* Bull. Soc. Imp. Nat. Mose., 1865, 399, t. 7, figs. 11-14 (repr. Bemer 
<— tiber die Gattungen Betula und Alnus (1866) 19, t. 7, figs. 11-14). 
+ Bull. Soc. Imp. Nat. Mose., 1. c., figs. 16-20. 
} Bull. Soe. Imp. Nat. Mosc., 1. ¢., fig. 15. 
