part may thus become two or even three celis thick, as stated by Harvey G1BSON 
(Journ. of Bot. 1892 p. 104), but a real parenchymatous dise I have never seen. 
From the basal layer numerous erect filaments appear, forming 6 mm. high clusters. 
The filaments are usually 9—12 7 thick, but the thickness may vary from 8 to 13 y. 
The cells are usually 2—4 times as long as broad (more rarely 1—5 times). The 
cells contain a parietal chromato- 
phore with a well developed pyre- 
noid, very prominent in the inter- 
ior of the cell; sometimes the 
pyrenoid is so large that the part 
of the chromatophore in which it 
lies reaches nearly to the part of 
the same chromatophore on the 
opposite side of the cell (fig. 34 F). 
According to Kyrın (1907 p. 118) 
hairs rarely occur, a sporangia- 
bearing branchlet terminating in 
a hair instead of a sporangium. 
I have never seen unicellular hya- 
line hairs; on the other hand the 
fertile branchlets were often found 
tapering into very thin hair-like 
filaments, the cells of which be- 
come longer and thinner and de- 
coloured upwards (fig. 34 C), as in 
Ch. Thuretii. 
The sporangia are always sit- 
uated on branchlets which are 
more or less branched; the most 
vigorous are repeatedly branched 
and consist of at least 3 generations 
of branches, the youngest of which i 
one 3 : Fig. 34. 
1S situated on the inner side of the Chantransia Daviesi. A and B, basal parts of plants growing on 
foregoing, so that the branchlet gets the stalk of Laminaria digitata seen from above and from the side. 
0 C—E, erect filaments with sporangia-bearing branchlets. F, three 
the form of a fan-shaped fascicle. cells showing the chromatophore (December). A—E 300 :1, F 3%:1. 
These branchlets are mainly placed 
in the axils of the branches, on the inner side of their undermost cell, but they 
may also occur scattered on the sides of the principal filaments. In the first case 
one fascicle only is placed in each axil, especially when the branchlet is well de- 
veloped, but not rarely two less branched branchlets are placed the one over the 
other (fig. 34 D), and there is then a resemblance with Ch. Thuretii; typical sporan- 
gia-bearing fascicles are, however, always to be found on the same plants. I found 
D. K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk. og mathem. Afd. VII. 1. 14 
