194 BRITISH MARINE ALG. 
they approach the tips of the branches and ramuli, which terminate in 
little thumb-and-finger-like hooks. 
The branches are set throughout, more or less abundantly, with short, 
jointed, simple or forked ramuli, the tips of which are hooked inwards. 
Favellze are produced at the tips of the ramuli and in the forks of the 
terminal branchlets, surrounded-by a collar of tiny ramuli, as seen at b, 
Fig. 177. The beautiful tufted fronds of this species are usually from 
din. to 6in. long, but I have taken specimens in Bovisand Bay, many 
years ago, a foot in length, finely in fruit, and of the richest mixture of 
reddish purple and silver, the tints of which are as brilliant at this 
moment as the day on which I first mounted the plants. C. nodosum, 
now C. tenuissimum, is one of the finest and most delicate of the genus. 
Its slender filaments are finer than human hair and are of equal diameter 
throughout. The pellucid internodes of the stem are several times longer 
than broad, becoming gradually shorter upwards. The dark-coloured 
nodes are usually broader than the colourless spaces between them, and 
from the sides of these in some of the shorter ramuli, prominent tetra- 
spores are produced, as seen at c, Fig. 177. Favellxw, as represented at 
d, are seated near the tips of the ramuli in an angle formed by the tip 
of the branchlet and a short accessory ramulus. The little erect tufts of 
this species are rarely more than 4in. long, and are of a delicate pinky 
colour. Nearly allied to this species is the exquisite little plant C. 
fastigiatwm, the hair-like tufts of which are truly fastigiate or level-topped, 
the tips being all directed upwards and slightly curved inwards. The 
lower internodes are three or four times longer than broad, the upper 
ones very short. The colour of the nodes is a lovely rose tint. Favelle 
of small size are produced from the sides of the terminal branchlets 
supported by a few very short ramuli. Fig. 179 represents a terminal 
branch of a filament, which is divided with such regularity, that each 
fork, even to the very tips, is an exact repetition of the one below it. This 
pretty species is somewhat rare, but I have taken it in Scotland and in 
several stations on the South Devonshire coast. OC. strictwm is another 
favourite species, abundant during early summer in Torbay and around 
the rocky bays at Plymouth. The fronds are densely tufted, the filaments 
capillary or hair-like, and excessively branched and interwoven. The 
nodes are a loyely purple, the inter-spaces shining like silver, and in the 
lower parts of the filaments several times longer than broad, but gradually 
shorter as they ascend upwards. The branches are set here and there 
with little accessory ramuli; and these as well as all the branches of the 
plant, terminate in a little hook, the tips of which incline inwards, and 
‘close upon each other like a tiny pair of sugar-nippers. Fig. 180 repre- 
sents a terminal branch, the forks of which, like all the rest of the plant, 
are erect and straight, the angles of all being regularly acute. C. gracil- 
limum is the smallest and most delicate of all the British Ceramiew. Its 
tender and very flaccid threads are generally so crowded and entangled, 
that it is a trial of patience and skill to display them properly on paper. 
