216 GOTE TURESSON 
A. LYSIMACHIA VULGARIS. 
The extreme shade form of this plant has been found most ty- 
pically in the moist Alnus swamps of Hallands Väderö. The habitus 
of the shade form differs markedly from the ordinary form, as has 
already been pointed out, although rather incompletely, by Grück 
(1911). The stems of the shade form are thin and slack, and, in their 
upper half, horizontally expanded. The leaves stand horizontally and 
almost in one plane; they are considerably larger than in the ordinary 
form but very much thinner. Flowers are rare. 
A dozen of these plants, collected in different spots within the 
swamp area, were brought home in 1920. By the following year 
(1921) the habitus of these plants was already changed and cor- 
responded now in all essentials with the ordinary form. The changes 
brought about in the culture are best followed in regard to the leaf 
structure. Fig. 75a (p. 329) represents a cross section of a leaf 
of the shade form. They were found to be between 123—157 «. thick 
and did not have any typical palisade layer. The figure to the left is a 
cross section of a leaf of the same plant from the culture in 1921. 
The leaf thickness was now found to vary between 358—368 4., and 
powerful palisades in two layers are found throughout. The anatomi- 
cal leaf structure as well as the habitus of the separate plants be- 
longing to this series do not at present exhibit any observable differen- 
ces from sets of the ordinary form brought home and transplanted 
from the beach at Ringsjön (middle part of Scania) in 1920. 
It should not’ be thought that Lysimachia vulgaris might not be 
found to show hereditary shade forms, but the evidence adduced above 
points to the fact that the Hallands Väderö shade form is merely a 
shade modification of the ordinary form. 
B. LYSIMACHIA NUMMULARIA. 
Series of this plant were collected and brought home from various 
points in Scania in 1920. The cultivated material thus includes series 
from moist pastures at Akarp, from similar habitats in the neighbour- 
hood of Malmô, and from the woods south of Kivik (on the east coast 
of the province of Scania). The latter locality is heavily wooded with 
oak, elm, Norway maple, ash and linden, while the former localities 
consist of open, grassy, and somewhat moist pastures. Careful exami- 
nation reveals differences between the pasture nummularia and the 
