89 



Ericaceœ. 



Rliododeudron lapponicum Wahlenb. (Figs. 6 — 8.) 



Warming, 1887, pp. 111—12; 1885, pp. 35 — 36. Borgesen, 

 1890, pp.236— 37. Ambronn, 1980, p. 71. O.G.Petersen, 1901, p. 78. 



I have had specimens for investigation from the following 

 localities: — West Greenland: Kakortok (June 6, 1887); Adglu- 

 mersat (June II, 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.). 





Fiy. 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 papillae of the lower 



epidermis in surface view, в. 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 culicu- 



