THE GENOTYPICAL RESPONSE OF THE PLANT 253 
on the characteristics of the resulting pure cultures. The number of 
individuals in each pure culture varies this year between 15—25. 
Nämndö, off Stockholm, 1920; plants of rather low stature; leaves 
deep blue-green. 
Oxelösund, S6dermanland, » ; plants stouter and considerably more 
branched than the former; not quite 
as blue-coloured. Shewn in fig. 25. 
Geta, Östergötland, » ; plants resembling in all essentials the 
Nämndö form. 
Vastervik, Smaland, » ; plants resembling in all essentials the 
Nämndö form. 
Kalmar, Smaland, » ; plants more slender than any of the 
former; the margin of the fruiting 
bractlets denticulated. 
Kastlösa, Oland, 1918; low of stature compared with most 
of the other forms; inflorescences 
short and contracted. 
Slite, Gottland, 1920; low of stature; leaves and stems 
brightly anthocyan coloured. I- 
- lustrated in fig. 26. 
The individuals of these cultivated biotypes differ markedly only 
in one respect from the plants in the natural habitat, viz. in size. The 
»wild» plants are dwarfs compared with the plants obtained in the 
cultures. The thickness of the leaves is often greater in the cultivated 
biotypes than in the plants from the natural habitat, apparently be- 
cause of the better development of the former plants. The thickness 
of the leaf attained in the cultivated Kastlösa forms, for instance (pre- 
pared from the cultivated material, 1922) has not been found in any 
material from natural habitats, where the thickness of the leaves varies 
around 1000 “. In the Kastlösa form the leaf thickness has been found 
to attain 1155 4. 
The forms making up this eastern type of A. sarcophyllum have 
been followed from the islands outside of Stockholm to Karlskrona in 
Blekinge (the province east of Scania). The group has been described 
under the specific name of A. praecox by HüLpners (LinpMan, 1918), 
and a form with contracted inflorescences apparently belonging to 
this group (and perhaps identical with my cultivated Kastlösa form) 
has been described by Jonanson (1897) from Gottland under the name 
A. patulum f. globosum. 
