INDEX (Continued) 



Page 



Prenanthes 47 



Primula 43 



Prunella 44 



Pseudoleskea 55, 57 



Pseudoasugao 9 



Pterigynandrum 55 



Ptilidium 58 



Puccinia 62 



Pucciniastrum 63 



Purshia 34 



Pyrenophora 64 



Pyrola 43 



Pyrus '. 36 



Radicula 30 



Radula 58 



Ranunculus 27 



Rhacomitrium 52 



Rhamnus 39 



Rhus 39 



Rhododendron 43 



Rhytisma 64 



Ribes 33 



Ricciocarpus 60 



Rinodeina 60 



Roestelia 64 



Rosa 35 



Rubus 35 



Rudbeckia 50 



Rumex 26 



Sagina 26 



Salix 23 



Salsola 26 



Sambucus 46 



Sanguisorba 35 



Sanicula 43 



Saxifraga 30 



Scapania 58 



Scirpus 20 



Schistidium 52 



Page 



Schistatego 53 



Scouleria 52 



Scrophularia 45 



Scutellaria 44 



Sedum 30 



Selaginella 8 



Senecio 48 



Septoria 64 



Serapias 23 



. Sidalcea 39 



Silene 27 



Sisymbrium 29 



Slum 42 



Smilacina 23 



Solanum 44 



Solidago 48 



Solorina 60 



Sonchus 47 



Spartina 17 



Specularia : 46 



Sphaerella 64 



Sphaerotheca 64 



Sphagnum 51 



Spiraea 35 



Spiranthes 23 



Splachnum ^53 



Stachys 44 



Stellaria 26 



Stenanthium 22 



Stereocaulum 60 



Sticta 60 



Stipa 17 



Streptopus 23 



Suaeda 26 



Symphoricarpos 46 



Synthyris 45 



Taraxacum 47 



Taxus 8 



Tayloria 53 



Page 



Tellima 33 



Tetraphis 53 



Thalictrum 28 



Thamnium 55 



Thecaspora 64 



Theloschistes 60 



Thlaspi 29 



Thuya 12 



Tiarella 33 



Timmia 54 



Tofielda 22 



Tortula 54 



Townsendia 49 



Tragapogon 46 



Trautvetteria 28 



Trifolium 37 



Triphragmium 64 



Trisetum 17 



Trollius 28 



Tsuga 10 



Umbelicaria 60 



Uncinula 64 



Uredo 64 



Uromyces 64 



Urtica 25 



Usnea 60 



Utricularia 45 



Vaccinium 43 



Valeriana 46 



Veratrum 22 



Verbascum 45 



Verbena 44 



Veronica 45 



Viola 39 



Webera 53, 57 



Xanthium 50 



Xerophyllum 22 



Zizia 42 



Zygadenus 22 



