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this gives for Oxalis an intensity of assimilation of about 0 mg
per 50 cm.*, at 18°, and for 1 hour. But since the CO, pressure
is in reality about 40% higher (see p. 71), the actual assimilation
according to fig. 5, becomes about 0.65 mg. And at more favour
able moments it runs up to 1 mg. and over. In Slellaria the in
crease is not quite so great.
Photo, the author
Fig. 7. Vegetation of Oxalis Acetosella at the southern side of a heech in the
Ulagap-bog.
What this involves for the forest-vegetation in its entirety is
obvious. The higher CO, pressure is certainly an important con-
dition for the existence of the shade-plants under less favourable
eonditions of light. The shade flora however stands in many
places on the limit of the minimum of existence, and therefore
depends on certain climatic conditions to a much greater extent
than the sun flora. Windy and dry summers have an unfavour
able effect by diminishing the available supplies of CO,: during
rainy summers on the other hand the supply of light sinks, so
that the shade-plants die much more quickly than would otherwise
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