are thus growing in a cylinder, and the branching takes place in the same plane. 
The filaments attained only an inconsiderable length; I found them at most 5-celled. 
As I possess only dried specimens of the plant, I have not been able to determine 
with certainty the form of the chromatophore; I can only state that it is parietal 
and probably single. In the spores it appeared to be distinctly belt-shaped 
(fig. A—D, N). In some cases I believed I saw a pyrenoid (fig. H, P). The end-cells 
Fig. 67. 
Kylinia rosulata. A—D, plants with sporangia. E, basal cell, still undivided, bearing a hair. Æ, plant con- 
sisting of a basal cell giving off a one-celled branch which bears a terminal hair and an androphore-cell with 
an antheridium. G, plant with androphore-cell. H, J, plants with androphore-cell bearing two antheridia. 
K, a cell giving off two androphore-cells. L, the outer cell in a two-celled filament transformed into a car- 
pogonium; two spermatia adhering to the trichogyne (compare text). M, the cell given off from the basal 
cell seems to be a carpogonium; the threadlike organ to the right is probably the trichogyne, that to the left 
an androphore-cell. N, to the right probably a carpogone with adhering spermatium; at the upper side a 
short filament with sporangia. O, the thin cell to the left is probably a young androphore; above possibly a 
lrichogyne. P, the basal cell bears to the right an androphore-cell, above a three-celled complex, probably a 
young cystocarp; this bears an androphore-cell with two antheridia and a trichogyne. Q, plant bearing above 
a three-celled, presumed young cystocarp and to the left a more developed cystocarp. 550: 1. 
bear frequently a very thin, hyaline hair tapering upwards; such a hair is also 
sometimes given off from the upper side of the basal cell even before branching. 
The plants are often much reduced, the basal cell giving off only one or a few 
short filaments consisting of one or very few cells (fig. E—M, P). 
The sporangia-bearing plants bear usually no other reproductive organs. The 
sporangia are often terminal on primary filaments, being frequently separated from 
