resemblance to one of the larger species of Rvularia, especially 
to some of the fresh-water kinds, or those that inhabit dripping 
rocks : localities very similar to what our Schizothrie delights in. 
But the nature of its filaments, the absence of the basal 
globule, and of the firm gelatinous matrix, afford sufficient 
characters to separate it from any of the Revularia. 
Mr. Cresswell states that the Schzzothrix grows at the very 
top of high-water mark, in situations where it is exposed to the 
continual drip of fresh water fallmg from high mural cliffs, 
and that it is most luxuriant where the drip falls from the 
greatest height, which in the station observed is about fifty feet. 
In this locality, where only this curious plant has yet been 
found, it occurs in considerable quantity, extending for up- 
wards of twenty yards along the surface of a projecting piece 
of the cliff. It commences to grow late in the autumn, and is 
in perfection in November. 
I have peculiar pleasure in dedicating this species to its 
discoverer, who has explored with much zeal and ability the 
botany of his neighbourhood, not omitting the more minute 
Algee, which too commonly escape the notice of mere collectors. . 
I am indebted to him for many specimens of the rarer kinds, and 
for excellent observations on several of them; and we may anti- 
cipate much interesting information from experiments which he 
has commenced on the growth of Sea-weeds, in closed bottles of 
sea-water. Already, he writes im a recent letter, he has sueceeded 
perfectly with Bryopsis plumosa, which, m the space of a month, 
“has grown considerably, and is now putting out beautiful side 
branches.” ‘This subject deserves more attention. I may men- 
tion that I have myself a plant of Grifithsia setacea, imclosed in 
April 1846, which is now (Feb. 1848) in perfect health; that 
the water in the bottle has never been changed, and is as pure 
as when the plant was inclosed in it. No care has been taken 
of this plant, which stands on a hbrary shelf. 
Fig. 1. Scu1zoTHRix CRESSWELLIL; tufts, 7 si/u:—of the natural size. 2. 
Bundles of filaments :—magnified. 3. Portion of two filaments :—/ighly 
magnified. 
