INDEX OF GENERA. 



231 



Podostemon 83 



Pogonatum 147 



Pogonia 95 



Polanisia 11, 128 



Polemonium 65, 127 



Folyactis 188 



Polycarpou 128 



Polycystis 223 



Polyedriura 213 



Polygala 13 



Polygonatum 102 



Polygonella 83 



Polygonum 82, 127 



Polyides 206 



Polyrnnia 49, 126 



Poly podium 135 



Polypogon 117 



Polyporus 171 



Polyprernum 64 



Polysaccum 177 



Polysiphonia 204 



Polythrincium 187 



Polytrichum 147 



Pontederia 106 



Populus 90 



Porothelium 172 



Porphyra 209 



Porphyridium 214 



Portulaca 17, 129 



Potamogeton 99 



Potentilla 29 



Poterium 29, 130 



Pottia 143 



Preissia 158 



Propolis 194 



Proserpinaca 34 



Protococcus 213 



Prunus 28 



Psalliota 169 



Pterigynandrum .... 149 



Pteris 135 



Ptilota 206 



Ptychomitrium 145 



Puccinia 183 



Punctoria 208 



Pycnanthemum 76 



Pylaisia 150 



Pyrenula 167 



Pyrola 60 



Pyxidanthera 61 



Pyxine 161 



Q 



Quercus 88 



R 



Racomitrium 144 



Radula 157 



Radulum 173 



Ramalina 159 



Ranunculus 2, 128 



Raphanus 11 



Rapistrum 128 



Reseda 11, 128 



Reticularia 177 



Rhabdonia 206 



Rhabdoweissia 142 



Rhaphidium 214 



Rhamnus 22 



Rhexia 35 



Rhinotrichum 187 



Rhizoclonium 212 



Rhizopogon 176 



Rhododendron 60 



Rhodomela 205 



Rhodora 60 



Rhodyrnenia 205 



Rhus 23 



Rhyuchosia 130 



Rhyncospora Ill 



Rhyncostegium 151 



Rhytidium 154 



Rhytisma 195 



Ribes 32 



Riccia 158 



Richardsonia 130 



Ricinus 133 



Rinodina 163 



Rivularia 221 



Robinia 24 



Rcestelia 184 



Rosa 31 



Roubieva 133 



Rubus 30 



Rudbeckia 50 



Rumex 83, 133 



Ruppia 99 



Russula..., . 170 



S 



Sabbatia 64 



Sagedia 167 



Sagina 16 



Sagittaria 98 



Salicornia 81 



Salix 90,127,133 



Salsola 81 



Salvia 77, 126 



Sambucus . 42 



Samolu8 61 



Sanguinaria 7 



Sanicula 38 



Saponaria 14 



Sarcoscyphus 154 



Sargassurn 207 



Sarracenia 6 



Sasbania 130 



Sassafras 84 



Saururus 84 



Saxifraga 33 



Scandix 130 



Scapania 154 



Scenedesmus 213 



Scheuchzeria 98 



Schizasa 137 



Schizophyllum 170 



Schollera 107 



Schwalbea 73 



Scinaia 106 



Scirpus 110, 133 



Scleria 112 



Scleroderma 176 



Sclerolepis 44 



Scleranthus 17 



Scolyrnus 131 



Scoparia 132 



Scrophularia 70, 132 



Scutellaria 78 



Scytonema 221 



Scy tosiphon 208 



Sedum 33 



Selaginella 139 



Seligeria 143 



Sehnum 38 



Sendtnera 156 



Senebiera 11 



Senecio 54,131 



Sepedonium 189 



Septoria 11 



Septonema 182 



Septosporium 187 



Sericocarpus 46 



Sesamum 132 



Sesuvium 37 



Setaria 125,134 



Sherardia 131 



Sicyos 37 



Sida 19, 129 



Silene 15,129 



Sirosiphon 221 



Bisymbrium 9, 128 



Sisyrinchium 97 



Slum 40 



Smilacina 102 



Smilax 105 



Solanum 69,132 



