276 GOTE TURESSON 
massive rock appears, viz. at Kullen, where partly wooded mountain 
hills attain a height of 80—190 m. above the sea, at Hofs Hallar, to 
the north of Kullen, and on the west side of Hallands Väderö, the small 
island lying off the. coast about 5 kilometres from Hofs Hallar. The 
cliff form is the only Hieracium umbellatum form found in these three 
localities. Typical sand dunes within the region are found at Torekov, 
a small fishing village about 4 kilometres to the south of Hofs Hallar, 
at Skelderviken, situated at the head of the bay with the same name, 
and at Nyhamn, about 10 kilometres to the south of Kullen. The sand 
dune form is strictly confined to these localities. In order to test the 
nature of these forms seeds were collected in 1917 from the cliff form 
of Hallands Väderö (seed collected from 10 turfs) and from the sand 
dune forms of Torekov and of Skelderviken (also from 10 turfs). 
Fig. 41. H. umbellatum. Cult. dune types from Skelderviken (to the left) and 
from Nyhamn. 
Before discussing these preliminary trials with Hieracium umbellatum 
a short account of the material of this species, now in culture, will 
be given. 
It was soon found that the species in question was well suited to 
investigations of this kind. It has an extensive and almost uninterrup- 
ted distribution in Scandinavia and occurs in widely different habi- 
tats. Efforts were therefore made to obtain the plant from as many 
different localities as possible. The collection brought together since 
1918 comprises at present more than 1200 well-developed turfs collec- 
ted in different regions in Scandinavia and in different habitats within 
one and the same region. Beginning on the west coast the collection 
includes series from different points on the Norwegian coast — Trond- 
hjem, Molde, Aalesund, Bergen. From the Swedish west coast series 
