101 



annual rings are on the whole fairly distinct and the spring 

 wood is differentiated from that of the summer. 

 The roots have not been investigated. 



Fig. 17. Fhyllodoce coerulea. 

 Transverse section of stem. >< 180. (Greenland.) (Phot.) 



Cassiope tetragona (L.) Don. (Figs. 18 — 21.) 



Warming, 1885, pp.53— 54; 1887, p. 108. Linsbauer. 1900. 

 BöRGESEN, 1895, pp.236 — 237. Ambronn, 1890, p. 70. O.G.Peter- 

 sen, 1901, p. 76. 



The specimens I have had for examination are from the 

 following localities: — West Greenland: Tatsip-ata (July 16, 1884, 

 Th. Holm); (Disco) Rode Elv (Porsild); Kekertat (Sept. 9, 1886); 

 Pugtokortok (July 13, 1887, С Ryder); Proven (July 2, 1888, 

 C. Myhre); Upernivik (July 11, 1886); tent 20 (Ryder); loc. ign. 

 (July 14, 1884). East Greenland: Danmarks Ö (Nov. 6. 1881, 



