382 



46 



stratum. The gnape-like short assimilators are thus put together nearly in a hori- 

 zontal layer on the surface of the patches (Fig. 24 and 25), as is described by 

 SvEDELius p. 120 and as I have already myself mentioned briefly in my paper 

 (5, p. 51). 



The locality gradually becoming more exposed the erect shoots grow shorter 

 and shorter and the plant on the whole smaller. As the assimilators often consist 

 only of a single ramulus and are at the same time more and more distantly placed, 

 the plant becomes like the figure 26, where one sees between the assimilators the 



Fig. 24. Caiilerpa racemosa (Forsk.) Weber van Bosse var. claoifera (Turner) Weber van Bosse. 

 Growing on cliffs of coral in the bay behind Christiansfort (St. Jan). F. B. fot. 



numerous densely entangled rhizomes. The figure shows a little piece of a large 

 tuft preserved in formalin; the tuft has over the whole the same appearance as 

 the small compact part shows. On especially exposed localities the assimilators 

 grow smaller and smaller, at the same time being less numerous; in such localities 

 the plant nearly entirely consists of the rhizomes. 



In the most exposed localities the plant becomes so reduced and diff'erent in 

 appearance that I will describe it as a special form: f. reducta (Fig. 27). This form 

 is characterized by its in all respects dwarf-like organs. The rhizomes are scarcely 

 a millimeter thick and bear on the downward side numerous richly ramified 



