XII 



Index of Genera. 



PAGE 



Oocystis 76, 506 



Ophiocytium 569 



Ophioglossuin • . . 249 



Orobanche 219 



Ortanthera 183 



Orygia 156 



Oscillatoria 66, 572 



Osmunda 245 



Oxalis 202 



P. 



Pandorina 1"1 



Panicum 227 



Parkinsonia 258 



Pavonia L59 



Pediastrum 79, 505 



Pelargonium 199 



Pellaea 245 



Pennisetum 228 



Penium 542 



Pentaschistis 229 



Pergularia 183 



Petalidium 259 



Peucedanum 214 



Phacus 602 



Phaeoptilum 138 



Pharnaceum 156 



Phormidium 66, 573 



Phragmites 230 



Phylica 207 



Phyllopodium 268 



Pinnularia 590 



Pituranthos 213 



Plantago • ... 163 



Pleiostomum 263 



Pleurococcus 76, 514 



Pleurotaeniuni 547 



Poa 243 



Podylaria 246 



Polanisia 36 



Pollichia 163 



Polycarena 269 



Polygala 39, 177 



Polygonum 162 



Polypogon 231 



Phonium 226 



Protea 189 



Psoralea 252 



Pterygodium 139 



Pteronia 277 



Ptychotis 214 



R. 



Rafnia 246 



Ranunculus 177 



Rhigozum 136 



Rhizoclonium 80, 542 



Rhopalodia 73 



PAGE 



Rhus 42, 209 



Rhynchosia 258 



Rhyticarpus 213 



Rivularia 581 



Rogeria 136 



Royena 220 



Rubus 174 



Ruellia 259 



Rumex 162 



S. 



Salix 163 



Salvia 164 



Samolus 135 



Sarcocaulon 198 



Sarcostemma 182 



Satyrium 138 



Scabiosa 137 



Scenedesmus 78, 506 



Schismus 241 



Schmidtia 240 



Schizochlamys 503 



Schizodium 137 



Schizothrix 575 



Schotia 258 



Scirpus 225 



Scypgogyne 133 



Scytonema 580 



Sebaea 57 



Secamone 179 



Selago 167 



Selenastrum 512 



Semonvillea 157 



Serpicnla 175 



Sericocoma 169 



Sericorema 169 



Serruria 192 



Sesamum 136 



Setaria 228 



Silene 194 



Simocheilus 133 



Sisyndite 170 



Solanum 270 



Spatallopsis 274 



Spergula 193 



Spergularia 193 



Sphaeralcea 159 



Sphaerocystis 502 



Spkaeroplea 80, 524 



Spirogyra 83, 563 



Spirulina 66. 572 



Spondylosium 662 



Sporobolus 235 



Stachys 165 



Statice 217 



Staurastrum 88, 560 



Stauroneis 593 



Stellaria '.193 



Stigeoclonium 531 



