126 Morten P. PoRSILD. 
Plane, МО 02 06000000 
Sweden, Västervik, Liebmann 
Lapland, Luleå, Deinboll .... 
Finland, Äbo, Holmen....... 
Poland, Debelowo, Raciborski 
Lapland, Bosekop, Warming . 
— — Hartman . 
— Sakkabanı, Warming 
Letland, Riga, Buhse ....... 
Germany, Brandenburg, A. Lange 
oe © © © оо 
© fete ve Je) ФФ’ © соло ne 
oe © © © © © © we ew e, 
oe © © © © © © © © © © 
ee © © © © © © 0.0. 
ооо 
— — т папе 
Austria inferior, Spritzenhofer 
East Prussia, у. Duisburg.... 
Binlamal,, Nylame 6056000000. 
Sweden, MAMAN zen 
Russia, White Sea Island, Pohle 
0000000 009000 
ооо ON ONOMNOMONON ON 
OOo C00 OD OO 
000000080000 
Average of 184 measurements on 32 
SDOCMMOMSS 6 6 0600000008 
© ео © fe Ve, ce) © je) ie . 
10 WS 16 
2720 3,24 
Results of the investigations. 
Summarizing the results of the measurements listed above, we find: 
I. L. decumbens, Greenland 40 
specimens, 290 measurements 
II. Г. decumbens, Arctic America 
and Siberia 11 specimens, 68 
О (ЗБ 060000000000 
ПТ. L. groenlandicum, South Green- 
land 40 specimens, 308 measu- 
FEM EN USS sepa ele eee nee 
IV. L. groenlandicum, Boreal Ame- 
rica, 8 specimens, 50 measure- 
о tt oto 
У. Г. palustre, Boreal Europe 32 
ee 
14,41 
11—20,04—35 
27.77 
specimens, 184 measurements 15—27,30—45 
b 
(ES SE 
1,80 
) 
1/b 
3—6,91—11 
8,03 
? 
363113 ТЗ 
8,83 
) 
1,5 3.246 
3,14 
58.4115 
By comparing the lists I and III we see that the two Greenland 
species of Ledum in the great majority of cases will easily 
be distinguished by the shape of the leaves alone, L. groen- 
landicum being — as was known before — a more broad-leaved form. 
However, we must admit that in some cases the lists overlap, i. e. there 
