504 Dr. Greville on some new species of Sargassuni. 
to publish them in a modified form through the medium of the 
Botanical Society. It is quite possible that durmg such an in- 
terval of time the author of the ‘Genera et Species Algarum ’ 
may have received from other travellers some of the species dis- 
covered by Dr. Wight, in which case there will inevitably be a 
collision of names; and although my manuscript has been 
lying by me for a long period, M. Agardh will have the unques- 
tionable right which priority of publication confers. Where, 
however, we may have unfortunately described under different 
names the same plant, I may be allowed to hope that the figures 
which I have given will assist in removing the confusion. 
19. Sargassum gracile (nob.); caule teretiusculo, filiformi; foliis 
linearibus, utrinque attenuatis, remote subdenticulatis, uninervi- 
bus; vesiculis parvis, subspheericis, muticis, petiolatis, petiolis 
planis, dilatatis ; receptaculis ramosis, axillaribus, lineari. cuneatis, 
ad apicem compressis, acute et grosse dentatis. 
Hab. in mari Peninsule Indiz Orientalis ; Wight. | 
Root I have not seen. Planié, as far as I can judge from the 
mutilated specimens before me, 2 or 3 feet in length or more. Stem 
cylindraceous, filiform, giving off numerous spreading branches 
at intervals of about one inch, and which are 6 inches to a foot 
or more long. These branches are clothed with others several 
inches in length, produced at shorter intervals, on which are 
situated the fruit-bearing ramuli. Leaves an inch long or more, 
about a line broad, linear, acuminate, almost entire, or remotely 
denticulate, furnished with a nerve and pores, and attenuated - 
below into a very slender petiole. Vesicles about a line in dia- 
meter, subspherical, sometimes slightly pyriform, destitute of 
apiculus, supported on flat, foliaceous, dilated stalks, 1-14 line 
in length, and produced from the raceme of fructification. Re- 
ceptacles axillary, and occasionally also terminal, 1-2 lines long, 
linear-cuneate, cylindraceous and unarmed below, compressed 
and dilated above, and furnished at the margin and apex with 
large, sharp, often curved teeth. The receptacles form a spa- 
ringly divided raceme, one of the lower branches of which often 
terminates in a vesicle. Occasionally a receptacle becomes tri- 
quetrous in the upper part, in which case every angle is toothed : 
sometimes receptacles appear to be proliferous, suggesting the 
idea of a microscopic Cactus ; at others they are long and slender 
to the apex which suddenly expands into a broad mass or crown 
of foliaceous teeth. Colour reddish brown. Substance slightly 
cartilaginous. : 
The habit of the entire plant is lax and slender. 
20. Sargassum leptophyllum (nob.) ; caule brevi, tereti, tuberculato ; 
ramis primariis compressis ; foliis integerrimis, angustissime line- 
ee ae ee ee 
