— 9 — 



are rather long and nearly cylindrical but soon they grow shorter 

 and at the same time become swollen in the middle in such a 

 way that the cell-threads become monih'form, reaching a thickness 

 of about 13 — 14^. Compared with N. Schrammi the cells are 

 somewhat slender. 



The chromatophore (Fig. 4 C) is stellate and resembles very 

 much that of N. Schrammi though as a general rule it only fills 

 up the half part of the cell, namely, the top of the outermost ones 

 nearest to the periphery while it is found in about the middle of 

 the slender and more cylindrical cells further in. In the middle 

 of the chromatophore a pyrenoid is present. Having only dried 

 material for examination I have not succeeded in finding the nucleus. 



Placed in the middle of each of the peripheral bundles of 

 assimilation-filaments a single cystocarp occurs (Fig. 4^, B); it is 

 very rare that a second one develops on a side-branch. 



While in N. Schrammi nearly all the material was in this 

 stage of development, viz. the trichogynes still present, in Nemalion 

 longicolle nearly all the material had ripe cystocarps. These are 

 terminally placed on a rather long straight branch, the cells of 

 which are shorter and nearly cylindrical , grading rather evenly 

 over into the cells belonging to the carpogonic branch; sometimes 

 also as shown in fig. 4 A the growth of the branch has stopped 

 and a side-branch has then grown out as a prolongation of the 

 mother-branch bearing the cystocarp. The carpogonic branch is 

 composed of 4—6 cells; these are shorter than the vegetative ones 

 and contain only a slightly developed inconspicuous chromatophore 

 or only remains of it. The cell-walls of the carpogonic branch are 

 distinctly stained by hsematoxyline. The cells in the carpogonic 

 branch are about 9^ thick. In the youngest tips of the plant some 

 younger carpogonic branches occurred and a few with trichogynes 

 yet preserved were also found in the older part of the thallus 

 perhaps because they had not been fertilized; the trichogyne had 

 nearly the same form as in iV. Schrammi, growing thicker towards 

 the tip (Fig. 4 D). 



The carpospores were about 14// long and i\ fx broad. 



As to the outer habit, I may add to the description given 

 above that near the base the thallus grows at first thinner but 

 then it broadens out again to a small disc, by means of which 

 the plant is fastened to stones and shells on the bottom. 



The plant was growing in shallow water quite near the shore 



