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18 DR. А. B. RENDLE— BOTANICAL RESULTS 
General Report upon {һе Botanical Results of the Third Tanganyika 
Expedition, conducted by Dr. W. A. Cunnington, 1904 and 1905. 
By Dr. A. D. Вехоге, F.L.S. 
[Read 20th December, 1906.] 
Тнк following is an account of the plants collected by Dr. W. A. Cunnington 
in the three great Central African lakes in 1904-5. The main object of the 
expedition was the investigation of Lake Tanganyika, which, on one view 
of its origin and previous connections, might be expected to show in its flora 
and fauna evidence of a marine affinity. 
Dr. Cunnington arrived at Lake Nyasa early in June 1904, and spent 
about three weeks there ; one week at the southern end, a week in ascending 
the lake, and a week at Karonga at the northern end. He collected, as far 
as possible in the short time, specimens to illustrate the flora of the lake, 
including alge scraped from rocks, and tow-nettings containing diatoms 
and other plankton. He then crossed the intervening plateau to Lake 
Tanganyika, the southern end of which he reached early in July. About 
eight months were spent on and around Lake Tanganyika; the first two 
months at the southern end, the remainder in cruising about and visiting 
the most interesting and likely places on the lake-shore. As complete a 
representation of the flora as possible was collected, including scrapings from 
the rocks, submerged stems of plants, and tow-nettings made at various 
places, times, and seasons. Leaving Tanganyika on March 18, 1905, 
Dr. Cunnington reached Bukoba, on the western shore of the Victoria 
Nyanza, on April 16. During a stay of ten days here and during a short 
stay at Entebbe, representatives of the water flora of the lake were collected 
and a few tow-nettings were taken. 
The collections include about 45 species of the larger plants and more 
than 400 species and varieties of freshwater Algz, including Peridiniez. 
The seed-plants and fern-plants, numbering respectively 30 and 4, are of 
no special interest. They include a number of widely distributed aquatics, 
such as Najas marina, Potamogeton pectinatus, P. javanicus, Vallisneria 
spiralis, Pistia Stratiotes, Ceratophyllum demersum, Myriophyllum spicatum, 
Jussiæa repens, Trapa bispinosa and T. natans, some of which were not 
previously recorded from these lakes; and marsh-plants such as Juncellus 
lævigatus, Fuirena glomerata, and Lyuisetum ramosissimum. The most 
interesting from this point of view is Myriophyllum spicatum, an almost 
cosmopolitan water-weed ; the genus had not hitherto been recorded from 
Tropical Africa. Other species found are more or less widely distributed in 
Tropical Africa: such are Najas horrida, Potamogeton Schweinfurthii, Ottelia 
lancifolia, several species of Utricularia, Azolla nilotica, Pycreus Mundtii, 
and Pepalanthus Wahlbergi, the last two being marsh-plants. 
