20 DR. A. B. RENDLE—BOTANICAL RESULTS 
(6) Jussiwa repens, a floating plant, widely distributed in fresh water in 
the warmer parts of the whole world. 
(T) Utricularia exoleta, widely distributed in fresh water in the warmer 
parts of the whole world ; leaves submerged. 
(8) Chara zeylanica, а submerged plant common throughout the tropics. 
The swamp and marsh plants are also widely distributed and afford no 
evidence of any peculiarity in the conditions associated with Tanganyika as 
compared with the other lakes. The freshwater Algæ, on the other hand, 
have yielded a rich harvest, as ably set forth by Mr. G. S. West. They 
include representatives of 101 genera and 367 species, of which one genus 
Sphinctosiphon, belonging to the Palmellaceze, and 34 species are described 
as new. Mr. Lemmerman, of Bremen, has worked out the Peridiniex, 
whieh comprise representatives of 4 genera and 5 species ; two of the latter 
are new. The plankton from Tanganyika is of special interest, partly 
from the fact that no work has been previously done on the plankton from 
this lake, but especially from the great difference from that of Lake Nyasa 
and Victoria Nyanza, and the striking marine affinity of some of its 
constituents. Several of the species are usually marine or brackish in habit, 
and others more nearly approach marine than freshwater species, indicating 
in Mr. West's opinion that at one time the lake must have approached marine 
conditions in the salinity of its water. 
The most interesting part of the report is, as I have indicated, Mr. West’s 
account of the freshwater Algz, which forms an independent paper. In the 
determination of the higher plants I have to acknowledge the help of 
Mr. Е. С. Baker, Mr. Arthur Bennett, Mr. А. Gepp, Messrs. Н. & J. Groves, 
Dr. Stapf, and the late Mr. C. B. Clarke. 
The plants have been presented to the Department of Botany, British 
Museum, by the Tanganyika Committee through Professor E. Ray Lankester, 
F.R.S., F.LS. 
DICOTYLEDONS. 
POLYGONACEJE. 
Polygonum barbatum, Linn. Lake TaNGaNYIKA.—From swamp, Kituta, 
Aug. 24. No. 26. 
Widely distributed in the tropies of the Old World. 
P. lanigerum, А. Br., var. africanum, Meissn. Lake TANGANYIKA.—Marsh 
close to shore, Komba Bay, Oct. 11. No. 34. 
Tropical and South Africa. 
P. glabrum, Willd. Lake Nyasa.—From swamp, Kota Kota, June 90. 
No. 6. 
Widely distributed in the tropics. 
