BIBLIOGRAPHY. 
95 
most interesting of the new species may be mentioned Phormidium 
moniliforme, Gomont, a plant which is said to be found in Scotland. 
The trichomata are only 1*8 to 2*2 p in diameter, and form a 
gelatinous mass over the filaments of Choetomorpha. 
LJlva Schousboei , Bornet, a species presenting the exterior ap- 
pearance of a Letterstedtia. 
Enteromorpha micrococca , Kiitz., var. polyopa, Bornet, which re- 
sembles U. reticulata in possessing a net-work of filaments. 
Nemoderma tingitana, Schousb. — A most extraordinary alga, 
belonging to the Phseophycese, but differing from all other phseo- 
phycese in its fructification. Its reproductive organs are of three 
kinds, which Dr. Bornet lias provisionally called plurilocular 
sporangia, antheridia, and unilocular sporangia ; but, of course, 
their real characters can only be determined from the living plant. 
The plurilocular sporangia and antheridia are scattered together 
through the whole thallus. The plurilocular sporangia are siliqui- 
form, and are formed by the transformation of a multicellular 
branch, the superimposed articulations of which swell and divide 
by vertical partitions into numerous cellules. The antheridia 
greatly resemble those of Polysiphonia , but differ from them alto- 
gether in their mode of development. The unilocular sporangia 
are rarer than either of the other forms of reproductive organs ; 
they are formed by the enlargement of an intercalary articulation 
of an erect filament into an ovoid sac. 
Rhodochaete pulchella , Thuret. — An alga resembling an Acrochce- 
tium in appearance, but differing from that genus in the formation 
of the spores which are formed in the continuity of the filaments, 
like those of Erythrotrichia. 
Flahaultia appendiculata , Bornet. — In the genus Flahaultia the 
central portion of the frond is occupied by a loose layer of articu- 
lated branching filaments, on either side of which are several layers 
of oblong or roundish cells, which diminish in size towards the 
periphery, which is composed of a layer of small coloured cells, 
arranged vertically. The cystocarps, immersed in the tissue of the 
frond, are prominent on its surface, more so, however, on the side 
where the pericarp opens. The nucleus is formed by a reticulated 
lacunose, lobed placenta, composed of anastomosing cellules, around 
which radiate the sporiferous filaments. 
Nitophyllum ciliatum (Schousb.), Born. — An alga resembling N. 
pulchellum and punctatum in general appearance and the entire ab- 
sence of veins, but differing from both in having the margins of the 
frond ciliated, and tetrasporic sori occupying the centre of the frond. 
Cystocarps scattered. 
N. dentatum (Schousb.), Bornet. — An interesting species belong- 
ing to the section Dawsonia , of which all the species at present 
known, with this solitary exception, come from either Australia or 
New Zealand. 
Spermothamnion capitatum , Bornet. — In many respects this plant 
