Xil 
Nephromium, 240. 
Nerium, 156. 
Neslia, 323. 
Newberrya, 344. 
Nicotiana, 99. 
Nidularia, 72. 
Nitella, 55.- 
Nitzschia, 412, 5or. 
Nolina, 212. 
Nummularia, 135, 323. 
Nyssa, 166, 
Obeliscaria, 410. 
Obolaria, 540. 
Ochrolechia, 239. 
Ocimum, 163. 
Odontia, 56. 
Odontidium, 412. 
Odontoglossum, 591. 
Oedogonium, 328, 485. 
Oenanthe, 343. 
Oenothera, 128, 168. 
Oldenlandia, 27, 165. 
Oldhamia, 370. 
Ombrophila, 56. 
Omphalaria, 240. 
Omphalia, 141, 326. 
Onchophorus, 367. 
Onoclea, 225. 
Oospora, 470, 481. 
Opegrapha, 238. 
Ophioglossum, 95, 545, 586, 589. 
Opuntia, 421, 459. 
Orchis, 352. 
Oreocarya, 58. 
Ornithogalum, 405. 
Orobanche, 410. 
Orthoneis, 501. 
Oryzopsis, 457. 
Osmunda, 103, 407. 
Otophylla, 212. 
Ovularia, 471. . 
Oxalis, 176, 487, 583. 
Oxydendron, 477. 
Oxypolis, 478. 
Oxystelma, 305. 
Oxytria, 405, 541. 
Pachnolepia, 238. 
Palaeoxyris, 317. 
Panicularia, 348, 541. 
Panicum, 40, 51, 59, 166, 167, 192, 280, 
324, 325, 327, 328, 345, 360, 541. 
Pannaria, 240. - 
539. 
Paronychia, 335, 542. 
Parosela, 14, 168. 
Parthenocissus, 408. 
Paspalum, 21, 38, 166, 192. 
Paullia, 240. 
Peceania, 240. 
Pectis, 273. 
Pedicularis, 292, 326, 542. 
Pellaea, 160, 216, 409. 
Peltandra, 451. 
Peltidea, 240. 
Peltigera, 240, 341. 
Penicillium, 481, 505. 
Peniophora, 56, 277. 
Pentstemon, 60, 485, 561. 
Peponia, 501. 
Perilla, 571. 
Perichaena, 70. 
Peronospora, 83, 168, 472, 505. 
Pertusaria, 239. 
Pestalozzia, 30, 163. 
Peucedanum, 165. 
Peziza, 357. 
Phacelia, 333. 
Phalaenopsis, 159. 
Phalangium, 405. 
Phallus, 72. 
Pharbitis, 26, 212. 
Phaseolus, 151, 162. 
Phialea, 56, 323. 
Philadelphus, 100, 561. 
Philibertella, 305, 543. 
Philibertia, 305. 
Phlox, 284, 478. 
Phlyctis, 239. 
Phoenicites, 330. 
Phoma, 286. 
Phragmites, 122, 160, 324, 583. 
Phyllachora, 56, 208, 292. 
Phylliscidium, 240. 
Phylliscum, 240. 
Phyllitis, 455. 
Phyllosticta, 31, 163, 285, 462. 
Physalacria, 342. 
Physalis, 126. 
Physalospora, 130, 323. 
Physarum, 65. 
Physcia, 239, 341. 
Physostegia, 275. 
Phytophthora, 254. 
us, 592. 
Picea, 100, 275. 
Pilinia, 370. 
Pilophoron, 239. 
Pilotrichella, 215. 
Pinguicula, 344. 
Pinus, on 275, 276, 324, 369, 451, 567. 
2. 
