98 
transparent cells interrupted by trabecule of thicker-walled cells 
with contents; these are not, however, as distinctly developed 
as in Andromeda and Ledum. The primary cortex falls off 
very early, even by the end of the first year. The outermost 
part of the secondary cortex consists of an ordinary cork-tissue 
of no importance. 
Fig. 14. Loiseleuria procumbens. 
Transverse section of stem; several annual rings are discernable. >< 180. 
(Greenland.) (Phot.) 
The annual growth of the wood is rather difficult to 
demonstrate, because, as it appears, lines are formed in the 
annual wood which resemble annual rings, but they can scarcely 
be such. In some cases the annual rings are however distinct. 
The spring wood is fairly sharply differentiated from that of the 
summer (or autumn) (O. G. Petersen, p. 78). 
I had no material of the root for investigation. 
