3. D raparnaldia repetita Hass.
Plate X I I . Pig. 2.
Char. Filaments branched, consisting o f repeated series o f cells,
each series composed o f fiv e or six cells, which decrease in
size from the fir s t or loioer cell to the last or upper one,
series oblique. Tufts dense, alternate.
Hassall, in Annals of Nat. Hist., August, 1842; also in
loc. cit. vol. xi. 428.
Hah. Cheshunt: A. H. H.
“ I have only once met with the above species, and then
but in small quantity : it is therefore no less rare than it is
curious. Fach series of cells is an epitome of the entire plant,
Avhich consists hut of an aggregation of such series. A
sketch of it was forwarded to Dr. Greville, who did not hesitate
to agree with myself in the opinion of its distinctness.”
4. D raparnaldia condensata Hass.
Plate X I. Fig. 1.
Char. Filaments o f considerable size, sparingly branched.
B r a n c h e s with short cilia. Cells abbreviated.
Hassall, in Annals of Nat. Hist. vol. xi. p. 429.
This is one of the finest and most distinct species of the
genus. The only locality at present known for it Is a large
fish pond opposite Mr. Bosanquet’s school for girls in the
parish of Wormly, Hertfordshire. I t differs fro°m the two
preceding species in several respects. I t is more sparingly
branched, the ramuli are never tufted, and the cilia rarely
prolonged: the cells are very short, usually broader than
long, a,nd entirely filled with endochrome. The habit of the
plant is also different, dwelling in water less fresh, and its
colour m consequence is less vivid than in most other Dra-
parnaldiae.
y
5. D raparnaldia tenuis Ag.
P late X I. Fig. 2.
Char. Filaments slender, ciliated, sparingly branched.
Branches usually simple and solitary, but sometimes sub-
fastigiate. Cells o f the stems twice or thrice as long as
broad, those o f the branches rather longer than hroad.
Hab. Streams near Cheshunt : A . H. H. Reservoir, Ar-
drossan : Major Martin. BetAveen Pembury and Tunbridge;
HaAvkhurst and Gondhurst, K en t: Mr. Jenner.
This is a much smaller species than any of the preceding,
is more tenacious, and an inhabitant of streams and rivulets,
the current of which is strong. Filaments very slender, four
to six inches long, irregularly or alternately branched, more
or less furnished with scattered or subfasclculate ramuli,
whose tops are either acute or draAvn out into long setaceous
colourless points. Joints of the main filaments and ramuli
coloured or transversely banded. “ A t first the filaments are
enclosed in the manner of a Choetophora in a common somewhat
definite gelatine ; afterAvards, on its bursting, they issue
from it like a Conferva, but are at all times very gelatinous.”
-— Harvey, Manual o f Brit. Algæ, p. 122.
6. D raparnaldia elongata Hass.
Plate X . Fig. 3.
Char. Filaments very slender, ciliated. Cells fasciated, usually
three times as long as hroad.
Hassall, in Annals of Nat. Hist, for August, 1842 ; also
in loc. cit. vol. xi. p. 4.
Hab. Cheshunt : A . H. H. Parkind : Major Martin.
The filaments in this species are finer than those of D.
tenuis, and the cells longer. I have no doubt of its distinctness.
I t is a rare species, and I have only twice met
with it, once growing in a horse trough near Cheshunt.