186
A. D. BONEY
Pro. 12. Gelidium cartilagineum (Scale line = 15 cm].
tioned by climatic factors than by the growth phase of the plant.
Johnstone and Sweeney (1944), in an investigation designed as a study
of the possible need for conservation of the agarophyte, found that
tetrasporangium-bearing plants predominated throughout the year, and
that there was little evidence of any seasonal periodicity in fruiting
behaviour. Nor was any variation noted with the relative proportions