68 Nr. 2. C. H. ÖSTENFELD and C. SYRACH LARSEN: 
of the cone of L. decidua or L. Gmelini var. olgensis. Its 
incurved cone-scales, with their inflexed free margins 
nevertheless constitute L. sibirica a well-defined species, 
and its characteristics do not appear to vary much, 
Fig. 21. L. sibirica Ledeb. Kuretj on the western side of Lake Baikal, 
in mixed forest, leg. Sukatschew, 1928. (Nat. size, upper row dry, lower 
row wet). 
although it shows some transition into L. decidua in the 
most westerly area of occurrence, L. decidua var. polonica 
being a stage approaching L. sibirica. The outer-side of the 
cone-scale is, moreover, faintly pilose to closely matted, 
chiefly at the base. At maturity, the cone-scales open more 
than is the case with L. decidua, but not so much as L. 
Gmelini, and the wing of the seed does not reach quite as 
far as the free margin of the cone-scale. 
