INDEX. 481 
Nodularia, Mert., 191. 
Harveyana, Thur., 172. 
sp. 172. 
sphærocarpa, Bonn. $ Flah., 171. 
tenuis, G. S. West * , 171. 
Northern plants of Mexico, 431-435, 439. 
Nostoc, Vaucher, 168; from Tanganyika, 
93, 97. 
carneum, Ag., 169. 
paludosum, Kiitz., 93, 168. 
piscinale, Avitz., 93, 169. 
Nostocaceæ of Tanganyika, 168. 
Notochopsis, Wood, 167; of Tanganyika, 
97; mentioned, 168, 
Goetzi, Schmidle, 167; mentioned, 
168. 
lobatus, Wood, 168. 
Nuphar luteum, Sibth. & Sm., 209, 212. 
Nyasa, Anabena of, 91; Phytoplankton 
of, 83; Plankton from, 81. 
Nympha alba, Linn., 209, 212. 
calliantha, Con., 21. 
dentata. Schum. $ Thonn, 21. 
Heudelotii, Planch., 21. 
Lotus, Linn., 19, 21. 
lutea, Linn., 209, 212. 
ovalifolia, Con., 21. 
zanzibarensis, Casp., 21. 
Nymphæaceæ, fossil, 209; primitive fea- 
tures, 45, 46. 
sp., fossil, 212. 
Oberonia condensata, Ridl. * , 522. 
Oedogoniacere, 98. 
Oedogoniales, 08. 
Oedogonium, Link, 98; referred to, 96; 
sterile species of Nyasa and Tan- 
сапуіка, 100, 
alternans, Wittr. § Lund., mentioned, 
99. 
Borisianum, ИИ, mentioned, 99, 
100. 
cataractum, Wolle, mentioned, 99. 
cryptoporum, Wittr., 98. 
cyathigerum, Wittr., mentioned, 99. 
dictyosporum, Wittr., 93. 
Hirnii, Gutw., 98. 
var. africanum, С. 5. Test *, 98. 
Kitute, б, 5. West *, 99. 
Oedogonium Kurzii, Zeller, 99 ; mentioned, 
82. 
Oenanthe Lachenalii, C. C. Gmel., 209, 215. 
Phellandrium, Lam., 209, 215. 
Olea capitellata, Ridl. *, 517. 
Oleaceæ, from Pahang, 217; from Ruwen- 
zori, 267. 
Oleandra neriiformis, Cav., 354, 
Onagrarieze, fossil, 209. 
Oocystide of Tanganyika, 141. 
Oocystis, Näg., 141. 
lacustris, Chodat, 141; ef. 92. 
parva, IF. § G. 5. West, 141. 
solitaria, Wittr., 141. 
Ophioeytium, Näg., 147. 
parvulum, 4. Br., 147 
Ophiorrhiza Mungos, Linn., 811. 
Orchidere, fossil, 322 ; Fokien, 367 ; Ruwen- 
zori, 294, 
Orchis pyramidalis, Linn., 4. 
Oreocharis amabilis, Dunn *, 362. 
Benthami, C. В. Clarke, var, reticu- 
lata, Dunn, 262. 
Oreograstis Emini, К. Schum., 24]. 
Origin of Angiosperms (Arber & Parkin), 
29. 
Oritrephes, Ridi.#, 309; referred to, 
302. 
pulchra, 2201. *, 309. 
Ornithogalum Eckloni, Sehlecht., 329; 
mentioned, 229. 
Orobanche minor, Sutt., 269; mentioned, 
951. 
Orobanchez from Ruwenzori, 269. 
Osbeckia densiflora, Gilg, 252; mentioned, 
320. 
Oscillatoria, Vauch., 177 ; of Tanganyika, 
83, 93. 
amphibia, Ay., 177. 
Cortiana, Menegh., 178. 
formosa, Bory, 178. 
geminata, Menegh., 177. 
Princeps, Vauch., 177. 
purpurea, Hook, f. & Harv., 174. 
splendida, Grev., 177. 
—  — var. attenuata, JF. у б. 5. West, 
177. 
subbrevis, Schmidle, 178. 
subuliformis, Kitz., 93: 
177, 178, 191. 
mentioned, 
