404 



hl each leaf-apex liiere is an c pi the m a which opens out 

 almost at the iiiai>Mii, upon a slaiilirifr, iipwardly-direcled surface. 

 The tracheids lermiuale in intercellular spaces and the cells of 

 the epitheina have short hranches and undulalinp walls as in 

 the other species (Fig, 45, B). 



Fig. 45. Ran. lapponicus. 



A, Surface section of spongy parenchyma (Spitzbergen; '™/i). Jl, Longitudinal section of 

 a leaf-apex (Greenland ; '^'k) showing the epithema and some tracheids. 



The leaf- stalk has three vascular bundles, which are 

 almost like those of the fruit-stalk in structure, but are some- 

 what weaker; the pith and the corte.v are lacunose. The epi- 

 dermis contains chlorophyll; the cuticle is furrowed. 



R. Pallasii Schlecht. 



and 

 B. laiyponicus L. x R. Pallasii Schlecht. 



Lit. Hooker, 1833. Nathorst, 1883, p. 21. Ekstam, 1899, 

 p. 21. Andersson & Hesselman, 1901, pp. 42 — 47 (Figs, of leaf, 

 leaf-anatomy, etc.). 



Alcohol material from Spitzbergen. R. Pallasii : Advent Bay, 

 11.8.1882; the hybrid: Rendalen in Sassenbay, 15.7.1882. 



