126 MOKTEN i". l'ollSILD. 



N 



Poland, Niosikop 5 



Sweden, Vastervik, Liebniann 5 



Lapland, Luloa, Deinboli 6 



Finland. Abo, Holmen 10 



Poland, Uobolowo, Raeiborski 5 



I^apland, Bosekop, Warming (i 



— — 1 1 art man 6 



— .Sakkabani, Warming O 



Letland, Riga, linlisc 6 



Germany, Brandenburg, A. Lange 6 



— — J. Lange 5 



Austria inferior, Spritzenliofer 5 



East Prussia, v. Duisburg 5 



Kinland, Nyland O 



Sweden, Hartman 5 



Russia, White Sea Island, Pohle 10 



Average of 184 measurements on 32 

 s p e c i m e n s : 



Results of the in vest i gat ions. 



.Summarizing the results of the measurements listed abovc, \ve find: 



1. />. decuntbfns, Greenland 40 1 b Ib 



sper-imens, 290 measurements 7-12,79 — 21 1 — 1,85 — 3 3 — 6,91-11 



11. L. decumbens^ Arctic America 

 and Siberia 11 specimens, 68 

 measurements U, 11 1,80 8,03 



II. /.. groenlandicuni, South Green- 

 land 40 specimens, 308 measu- 

 rements 11 20,04—35 3— ().:J1 13 1,5 3,18- 7 



IV. L. groenlandicum, Boreal Ame- 

 rica, 8 sperimens, 50 measure- 

 ments 27,77 8,83 3, 1 4 



\ . /.. fjalustre, Boreal Europr 32 



specimens, 184 measurements 15 — 27,30 — 45 1.5 3,24 (i 5^8,41 — 15 



By comparing the lists I an<l III \ve see that the Iwo (iicenland 

 species of Leduni in the great majority of cases will ejisily 

 be distinguished by the shape <>r Ihe leaves Si\onG, L. groen- 

 hindicnm being - as was known before — a more broad-leaved form. 

 f[o\vev(>r. we m)ist admit that in some easos the lists overlap, i. e. there 



