89 
Ericacew. 
Rhododendron lapponieum Wahlenb. (Figs. 6—8.) 
Warning, 1887, pp. 111—12; 1885, pp. 35—36. Borcesen, 
1890, pp. 236—37. Ampronn, 1980, p. 71. O.G. Perersen, 1901, p.78. 
I have had specimens for investigation from the following 
localities: — West Greenland: Kakortok (June 6, 1887); Adglu- 
mersat (June 11, Kornerup); Tatsip-ata (July 15, 1884, Th. Holm); 
Umanaptimilia (Juli 17, 1887, C. Ryder). East Greenland: Hekla 
Havn (November 4, 1891, N. Hartz); Finmark: Alten (1885, E. W.). 
Fig. 6. Rhododendron lapponicum. 
1, Leaf in transverse section. 2, Epidermis with stomata below a peltate hair. 3, Stoma 
in transverse section. 4, The epidermis of the upper surface. 5, The papillæ of the lower 
epidermis in surface view. 6, Palisade-cells seen from above. (E. Warming.) 
The leaf. The epidermis of the upper surface is much 
thickened by the presence of a thick cuticle and beneath it a cuticu- 
