404 



INTRODUCTION TO PLANT GEOGRAPHY [CHAP. 





Fig. 129. — ' Late-snow ' patch in the highlands of central Baffin Island, showing 

 in foreground the outer zone of mixed Arctic Blueberry heath, then a narrow belt 

 of dark Arctic Bell-heather interrupted by light-coloured Lichens, and behind, 

 a Herb-like Willow zone {see Fig. 130), the centre of the snow-drift area where 

 the snow melts latest being occupied by a herb ' barren.' 



Fig. 130. — Looking down on the Hcrb-likc Willow zone ot the late-snow area 

 shown in Fig. 129. The rounded leaves are those of the dominant Willow, the 

 ground being characteristically encrusted with cryptogams. Pipe 15 cm. long 



gives scale. 



