OF THE THIRD TANGANYIKA EXPEDITION. 177 
Genus OSCILLATORIA, Vauch. 
322. OscILLATORIA PRINCEPS, Vauch. Hist. Conf. (1803) р. 190; Gomont, 
in Ann. Sci. Nat. 1° sér., Bot. xv. (1892) р. 206, t. 6. fig. 9. 
Tanganyika.—In plankton, Kituta Bay (27 Aug. 1904 ; no. 82). 
323. OscILLATORIA TENUIS, Ag. Alg. Del. ii. (1813) p. 25 ; Gomont, l. с. 
p. 220, t. 7. figs. 2, 3. 
Victoria Nyanza.—In swampy pools, Bukoba (20 Apr. 1905 ; no. 251). 
Tanganyika.—In plankton, near Mbete (28 Sept. 1904; no. 105). Among 
Utricularia, mouth of Malagarasi River (16 Jan. 1905 ; no. 611). 
324. OsCILLATORIA AMPHIBIA, Ag. in Flora, х. (1827) p. 632; Gomont, І. с. 
р. 221, t. 7. figs. 4, 5.—Oscillaria tenerrima, Аз. (1843). 
Crass. trich. 3 y. 
Victoria Nyanza.—Swampy pool near Bukoba (20 Apr. 1905 ; no. 618). 
325. OSCILLATORIA GEMINATA, Menegh. Consp. Alg. идат. (1837) p. 9; 
Gomont, 1. с. p. 222, t. 7. fig. 6. 
Crass. trich. 3 p. 
Муаза.— [п swamp, Karonga (2 July, 1904 ; no. 34). 
326. OscILLATORIA SPLENDIDA, (тег. Fl. Edinb. p. 805 (1824); Gomont, 
1. c. p. 224, t. 7. figs. 7, 8.—Oscillaria leptotricha, Kütz. Phyc. Germ. (1845) 
p. 157. 
Var. ATTENUATA, И. у G. S. West, in Journ. Roy. Mier. Soc. ser. 2, 
xvi. (1896) p. 165, t. 4. fig. 58. 
Crass. trich. 2:3 д. 
Tanganyika.—A mong Utricularia, mouth of Malagarasi River (16 Jan. 
1905 ; no. 611). 
327. OscCILLATORIA TANGANYIKA, sp. п. (РІ. 9. fig. 9.) 
О. triehomatibus solitariis natantibus et pelagiis, elongatis, olivaceo- 
viridibus, rectis vel subrectis, apicem versus longe attenuatis, apicibus 
curvatis vel interdum recurvatis, rotundatis vel rotundo-truncatis, inter 
cellulas constrictis ; cellulis subquadratis vel plerumque leviter brevioribus, 
apicem versus ad duplo longioribus ; cytoplasmate minute granuloso et 
interdum granulis magnis subrefringentibus (gas-vac. ?) paucis farcti ; cellula 
apieali plerumque valde curvata, nunquam capitata, extremitati rotundata vel 
subtruncata ; calyptra nulla. 
Crass. trich. 10-12 p; crass. apice. trich. 6 ш; long. cell. 6-10 ш; long. 
cell. apical. 11-15 р. 
Tanganyika.—In plankton, near Kirando (1 Dec. 1904 ; по. 175) and near 
Baraka (24 Feb. 1905 ; no. 240). 
This interesting Oscillatoria most nearly approaches O. subuliformis, Kütz., 
LINN. JOURN.—BOTANY, VOL. XXXVIII. N 
