. Ecological and systematic studies of the Ceylon species of Caulerpa. Marine algae. 126 CEYLON MARINE BIOLOGICAL REPORTS. they are consequently a kind of haptera (fig. 19 a, c, f, g, h, i) ; but these branchlets again form vertical axes and behave exactly as the other horizontal axes. The figures show several examples of this : so in fig. 19 /.we see a vertical axis where most of the pinnules at the base are gone, and only a few remain, which are just in the stage of growing out. They have not, however, as yet reached any length. Different is the case, on the other hand, with those which are
. Ecological and systematic studies of the Ceylon species of Caulerpa. Marine algae. 126 CEYLON MARINE BIOLOGICAL REPORTS. they are consequently a kind of haptera (fig. 19 a, c, f, g, h, i) ; but these branchlets again form vertical axes and behave exactly as the other horizontal axes. The figures show several examples of this : so in fig. 19 /.we see a vertical axis where most of the pinnules at the base are gone, and only a few remain, which are just in the stage of growing out. They have not, however, as yet reached any length. Different is the case, on the other hand, with those which are given in fig. 19 a, g, h. In fig. 19 a, for instance, may be seen a fully grown branch beginning to branch; in fig. 19 h, where, moreover, several branchlets have grown out it has formed roots too; and the same is the case in fig. 19 i, &c. In aU these cases it has been assimilation branches that have changed character and turned into attaching organs. These changed branchlets might possibly be looked upon as of Uttle value, since they do not develop in the same level as the rest of the rhizome system ; but here we must observe that the rocks are, of course, very uneven, with crevices and cavities, so that the haptera easily grip, even if they are developed higher up. This form with its creeping and chmbing rhizomes entangled in each other forms almost mat-like associations, from which here and there rich shoot systems radiate. Of aU the Caulerpas I have studied in Ceylon there is none which shows itself in its system of shoots so well adapted for the conditions of life in which it grows as this. That the same seems to be the case with this species in other places, for instance Western Austra'ia, can be gathered from Harvey's notes ("Phyc. ; I., PI. 30). Habvey says that the rhizomes form mats of the length of an inch or more with numerous and long roots, an apperance which is also to be seen in his figures of this plant. Harvey also mentions that it grows &
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