80 



Cassiope hypnoides p. 105 



— tetragona p. 101 



Chimophila umbellata p. 87 



Ledum palustre p. 91 



Loiseleuria procumbens p. 96 



Lyonia calyculata p. 1 10 



(Oxycoccos palustris) p. 118 



Phyllodoce coerulea p. 99 



Pirola grandiflora p. 80 



— minor p. 83 



— rotundifoUa p. 80 



— uniflora p. 86 



— secunda p. 84 



Rhododendron lapponicum p. 89 



Vaccinium Myrtillus p. 127 



Vaccinium Oxycoccos p. 118 



— uliginosum p. 123 



— Vitis-idæa p. 121 



Anatomicai description of the different species. 



Pirolaceœ. 

 Pirola grandiflora Rad. 



Syn. Pirola rotundifoUa v. grandiflora DC. 



Warming, 1885, p. 16. Stenström, 1895, p. 137 (cf. fig.) 



Material examined from: — West Greenland: tent 16 (Ryder); 

 Sarfanguak; Godhavn; Upernivik; Kangerdluarsuk. East Green- 

 land: Cape Stewart. 



The leaf (Fig. 1). The outer walls of the epidermis are 

 fairly thick, cuticularized beneath the cuticle, and thickened 

 especially on the upper surface of the leaf. Lateral walls undul- 

 ating, irregularly thickened, furnished with numerous pores. 

 Hairs are absent. Stomata are confined to the lower surface ; 

 they project slightly. The epidermis of the lower surface 

 contains chlorophyll grains. Distinct palisade-tissue does not 

 occur; in form, the upper cells of the mesophyll correspond 



