280 GOTE TURESSON 
rather common chasmophyte in the epilittoral belt and it also occurs 
higher up in the gnarled and wind-broken woody vegetation. A typical 
H. umbellatum chasmophyte from Hofs Hallar is seen in fig. 42. The 
leaves of these plants seldom exceed a width of 8—10 cm. in their 
natural habitat. When cultivated the leaves increase in width even in 
the first year after the transplanting. Table 13 shows the behaviour 
of H. umbellatum chasmophy- 
tes from Hofs Hallar which 
have been kept in culture du- 
ring three vegetation periods. 
The leaves do not attain the 
length of the Väderö plants 
(which fact may be due to the 
younger age of the material) 
but the width of the leaves va- 
ries within about the same. li- 
mits as in the Vadero plants. 
The stems are often more de- 
pressed than in the Väderö 
plants and deviations from the 
average of these plants are 
also seen in the characters of 
the leaf margin and of the 
inflorescence. 
The H. umbellatum growth 
in the isolated sand dune fields 
I je 
> - à = 
+ 
1 
à 
wir 
N, 
he 
Er 
gr 
Ge 
len has already been dealt 
with. The sea cliffs of Hal- 
lands Väderö and of Hofs Hal- 
lar reappear in more gigantic 
dimensions at Kullen. The list 
Fig. 45. H. umbellatum. Cult. inland type nos. 12 and 13 belong to se- 
from S:t Olof. 
ries brought home from this 
locality and cultivated since 1920. Table 17 (fig. 43) gives the cha- 
racters of the separate individuals in these series. The similarity 
between these series and the Hofs Hallar collection is at once seen. 
The average width of the leaves is about the same, and the characters 
of the leaf margin and of the inflorescence vary much in the same way. 
The cliff region of Kullen ceases abruptly to the south and the 
between Hofs Hallar and Kul- - 
