INDEX 



259 



Populus balsa ml fern. 125 7 . 



I candicans, 125 8 . 



grandidentata, 125*. 



tremuloides, 125*. 

 Porella platyphylla, 17G 9 . 

 Poria inermis, 219°. 



niarginella, 219 s . 



rhodella, 220 1 . 



subaeida, 220 3 . 



vaporaria, 219 8 . 

 Portulaca oleracea, 82 s . 

 Portulacaceae, 82 8 . 

 Potainogeton, 136 1 . 



alpinns, 136 T . 



amplifolius, 136 9 . 



natans, 136 4 . 



Nuttallii, 136 9 . 



Oakesianus, 13G 5 . 



Pennsylvanicus, 136*. 



perfoliatus, 137 1 . 



praelongus, 137*. 



rufescens, 136 7 . 

 Potentilla, 9P. 



argentea, 91 7 



Canadensis, 91 8 . 



fruticosa, 91". 



Monspeliensis, 91 8 . 



Norvegica, 91 B . 



palustris, 91". 



tridentata, 91 B . 

 Prenanthes, tall, 109*. 



PrenantJies alba, 109 7 . 

 altissima, 109 5 . 

 serpentaria var. nana, 110 1 . 

 Primulaceae, 115\ 

 Prince's pine. 113*. 

 Prunella vulgaris, 118". 

 Prunus Pennsylvanica, 87 1 . 



serotina, 87 s . 



Virginiana, 87 8 . 

 Psathyra silvatica, 213 7 . 

 Psilocybe foenisecii, 213 8 . 

 Pteridophyta, 152<-57 9 . 



summary, 236 8 . 

 Pteris aquilina, 154 1 . 

 Ptilidium ciliare, 177 1 . 



Pnccinla Asteris, 226 s . 



p u rp lira seen s, 226 9 . 



Circaeae, 227 1 . 



Claytoniata, 220 7 . 



mesomegala, 227 4 . 



porphyrogenita, 227*. 



Prenanthis, 226 5 . 



pulehella, 226 7 . 



Tiarellae, 227 s . 



Violae, 226 8 . 

 Purslane, 82*. 



water, 97 1 . 

 Pussley, 82 8 . 

 Pylaisia intricata, 170*. 



velutina, 170 s . 

 Pyrenomyceteae, 228 2 -30\ 

 Pyrola elliptica, 114 J . 



rotundifolia, 114 1 . 



secunda, 114*. 

 pumila, 114*. 

 Pi/rus Americana, 92*. 



iirbittifolia var. melanocarpa, 93 1 . 



Mains. 92 s . 



samhucifolia, 92 s . 

 Pyx i ne sorodiata, 183 7 . 



Quillwort, Braun's, 157 J . 



Racomitrium aciculare, 162*. 



fasciculare, 163 2 . 



microcarpum, 163 1 . 



Sudeticum, 162 8 . 

 Radula complanata, 176 s . 

 Ragwort, golden, 107*. 



Robbin's. 108 1 . 

 Ramalina calicaris. 180". 

 Ramularia Tulasnei, 235 5 . 

 Ranunculacoae, 72 3 -74 a . 

 Ranunculus, 72 8 . 



abortivus, 73'. 



acris. 73». 



aquatilis var. trichophyllns, 73'. 

 Flammula var. reptans, 73 1 . 

 Pennsylvanicus, 73*. 

 recurvatus, 73 5 . 

 reptans, 73 1 , 



