107 
seemingly by the formation of a terminal hyaline hair. The hair had usually dis- 
appeared, leaving only a faint scar, in some few cases it was still visible (fig. 35 B). 
The principal filaments consist in their lower part of short cells, about twice as 
long as broad; upwards the filaments become gradually somewhat thinner, and the 
cells at the same time longer. On the whole, the filaments are not much branched. 
Owing to the defective state of preservation of the material I have not been able 
to determine with 
certainty the forın 
of the chromato- 
phore. In some 
cases, however, I 
have seen that it 
is parietal, and I 
suppose it to be 
single and to have 
one parietal pyre- 
noid. 
The position 
of the sporangia is 
somewhat variable; 
they occur mostly 
in the upper part 
of the plant and 
are relatively often 
placed singly, more 
rarely two togeth- 
er on unicellular 
branchlets, or they 
are, though rarely, 
sessile on the fila- 
ments. Sometimes 
a greater number is 
placed on somewhat 
larger, often bran- 
ched branchlets, but 
Fig. 35. 
Chantransia attenuata. A, plant the basal layer of which is seen from the under face. 
350:1. B and C, upper ends of filaments with sporangia. 560 : 1. 
” such branchlets grade evenly to the long filaments. The sporangia-bearing branch- 
lets show usually no distinct arrangement on the filaments. 
The species is perhaps related to Ch. Thuretii; it differs from it by the op- 
posite branches and the small sporangia. 
Locality. Lf: MA in Nissum Bredning, 5 meters, on Desmarestia aculeata. 
