96 Nr. 2. C. H. OSTENFELD and C. SYRACH LARSEN: 
Hybridisation has undoubtedly taken place several times 
under cultivation, when two or more species have been 
brought together, and it is probable that a considerable 
number of crossings might be made artificially, but deli- 
berate experiments of this nature have not been mentioned 
hitherto in the literature extant upon the subject. 
L. Gmelini x sibirica, SZAFER in Kosmos, XXXVIII, 1913, 
p. 1297. 
Syn: 
L. Czekanowskii, SZAFER |. c. 
This hybrid is probably found on a broad belt stretching 
from Lake Baikalnorthwardstoabout the mouth of the Jenisej. 
It has been described by Szarer, and investigated by 
SUKATSCHEW in 1928 in the district round Lake Baikal, 
where it seems to grow extensively. He has kindly sent 
us abundant specimens of cones taken from a large number 
of trees, and these specimens give evidence of many different 
intermediate stages between the supposed parent species (see 
figs. 32—33 showing some of the cones). 
MIDDENDORFF (Middf. Reise IV, I, Teil, pp. 530 and 595) 
and CAJANDER (Act. Soc. Sci. Fennicae. XXXII, No. 3, 1904, 
p. 8) have both previously stated that no well-defined 
difference existed between the two species, and this belt 
with its hybridogenous intermediary forms is the natural 
explanation of their assertions. The matter has been dealt 
with in greater detail under L. Gmelini. 
Herb. Mat. examined: 
Maretuj, Cape Ulan (3 samples); the village Listwenicznoja, and the 
bays Kurkut (5 samles), Koty (3 samples) and Krestowka (1 sample), — 
altogether 14 samples from 14 different trees, all from the western Side 
of the Lake Baikal, W. SUKATSCHEw, 1928 (Hort. Bot. Haun.). — 
L. decidua x larieina, A. HENRY, in Gard. Chron. Ser. 3. 
LVIILL).191 5" 9.178 
