Orontium, 102, 106. 
Orthaea, 521. 
Orthotrichum, 52. 
Osbertia, 186. 
Osmunda, 288. 
Ostryra, 377. 
Oxalis, 45, 56, 139, 336, 338, 519. 
Oxycoccus, 407. 
Oxytropis, 405. 
Pachyma, 107. 
Paleohillia, 387, 388, 390. 
Palmella, 402. 
Panaeolus, 205, 286. 
Panax, 138. 
Panicularia, 405, 406, s12. 
Pannaria, 246, 375. 
Panicum, 137, 175, 301, 419, 420, 421, 422, 423,435, 
441, 462, 451. 
Parmelia, 191, 194, 242, 243, 244, 407. 
Parodelia, 2 37. 
Paronychia, 156. 
Parosela, 392, 393. 
Parrotia, oY fae 
Paspalum, 175, 420. 
Passiflora, 104, 392. 
Paullinia, 522. 
Paulownia, 467. 
Pavonia, 480. 
Pediastrum, 140. 
Peganum, 231. 
Pelargonium, 383, 469. 
Pelexia, 417. 
Peronospora, 364, 443. 
Sa 144, 156, 157, 238. 
usaria, 249. 
Pestalozzia, 177, 178 288, 
Petalostemon, 324. 
US, 99, 100, 460. 
X; 541 339, 480. 
ile 8 
n, 366. 
Phormidium, 427, 430°. 
Phyllachora, 210, 237, 449, 479. 
Phyllocactus, 188. 
Phyllospadix, 53. 
x 
Placodium, 246, 247. 
| Plagiogramma, 265. 
| Plantago, 46r. 
| Platanus, 226. 
Pleurosigma, 173, 265, 274. 
| Pleurotaenium, 290. 
| Pleurothallis, 90, 376, 417. 
| Plowrightia, 135. 
| Pluchea, 54, 174, 392. 
| Pluteolus, 203, 286, 
Pluteus, 488 
| Pneumaria, 407. 
Poa, 138, 465, 511, 517. 
Podosira, 173. 
| Podostigma, 145. 
| Polychidium, 197, 496. 
Polygala, 236, 479. 
| Polygonatum, 405. 
| Polygonum, 56, 139, 235, 280, 281, 383. 
| Polymnia, 136 
Polymyxus, 261, 265. 
| Polanisia, 144. 
| Polyplocium, 492. 
| Polyporus, 207, 286, 409, 418, 493. 
| Polypodium, 137, 146, 444, 520. 
| Polystichum, 405, 406. 
Populus, 131, 286, 462. 
| Porlieria, 229. 
Portulaca, 143. 
| Potamogeton, 142, 374, 393, 462. 
| Poterium, 405, 406. 
| Pottia, 442. 
Pottiariparia, 469. 
_ Primicorallina, 56. 
| Prionodon, 339. 
| Prochynanthes, 442. 
_ Prosopsis, 120, 121, 363, 385. 
| aad et 198, 402. 
| Protophyllum, 227. ‘ 
Pome, 238. 
| 519- 
| Psathyrella, 82, 490. 
| Pseudauliscus, 265. 
| Pteris, g1, 115, 210. 
| Prerocaulon, 143. 
| Pterospermites, 227. 
| Priloria, 87. 
| Puccinellia, 512, 512. 
| Puccinia, 58, 59, 60, 61, 136, 174, 185, 237, 284, 288, 
t 363> 435» 442, 443. 
_ Punctaria, 52. 
| Pycnanthemum, i 
Pyrenula, 191, 198, 260. 
| Pyrola, 461. 
| Pyrrocoma, 186, 
| Pyrus, 278. 
| Pythium, 235, 283. 
| 
| Quercus, 74, 75, 76, 89, 92, 118, 11g, 137, 139, 140, 
| 142, 146, 178, 330, 339, 365, 367, 377, 383, 392, 
396, 4375 443, 462, 519. 
Radiofilum, 140. 
| Railardella, 186. 
| Ramalina, 240. 
Ramisia, 521, 
| Ramularia, 57. 
| Raveoelt 63, 36 
| Ravenelia, 90, 132, 23 » 364, 443. 
| Rebusta, tt 3?» 237s 363, 364, 443. 
» 82. 
Rhaphoneis, 173, 265. 
| Prunus, 103, 132, 219, 237 278, 283, 286, 339, 442, 
