708 GENERIC INDEX 
Phycomyces, 202 Quercus, 109, 115, 145, 284, 289, 294, 
Phyllocladites, 445 578, 579, 582, 619 
Phyllocladopsis, 444 
Phyllocladus, 438-442, 444, 445 | Ramalina, 413 
Phymatodes, 675 | Ravenelia, 14 
Physcia, 413, 415 Rhexia, 294, 320, 323 
Phytolacca, 338 | Rhododendron, 143, 145-147, 181, 584 
Picea, 89, 90 Rhus, 291, 327, 580, 583, 619 
Pinus, 10, 98, 106-108, 250, 289, 293, | Rhynchospora, 282, 294, 320, 323, 324) 
294, 424 326 
Piptoporus, 423-425 Ribes, 10, 110, 119 
Pisum, 137, 151, 157-160, 507 Richardsonia, 147 
Placodium, 414, 415, 417 Riella, 214-224 
Plagiochila, 39 Rimella, 216 
Plagiogyria, 676 Rinodina, 415 
Plantago, 288, 341 Robinia, 110, 114, 115, 294, 503, 510, 583 
Platanus, 582, 594, 615 Rosa, 507, 511, 580 
Platycerium, 672 Rubacer, 274, 280 
Platytaenia, 674, 675 Rubus, 146, 273-275, 280, 507, 578, 582, 
Plectania, 100 583, 585, 692 
Pleocnemia, 679 Rudbeckia, 289, 321 
Pleosphaeria, 83 Rumex, 582 
Pleospora, 85 
Plicaria, 91, 92 Sabal, 283 
Poa, 338, 577, 581, 585, 590, 600 Sabbatia, 320, 338, 339 
Podocarpus, 441, 442, 445 Sacciolepis, 371, 383 
Polybotrya, 672, 679 Saccoloma, 680 
Polygala, 294, 323, 326 Sagenia, 679 
Polygonatum, 294, 602, 614, 620 Sagenopteris, 439 
Polygonella, 577, 582, 594, 614, 619 Sagittaria, 320, 321, 327 
Polygonum, 323, 582, 604, 618, 620 Salicornia, 613 
Polymnia, 292 Salisburia, 442 
Polypodium, 151, 201, 346, 356, 667, 671, | Salix, 86, 88, 145, 634-636 
673-675, 678, 679 Salomonia, 602, 603, 614, 618, 620 
Polyporus, 97, I10, I12-114, 116-120, | Sambucus, 507 
225-232, 297-301, 423-433 Samolus, 323 
Polystichum, 357, 679 Saponaria, 578 
Polystictus, 227 Sarothamnus, 510 
Polytrichum, 579, 586 Sarothra, 577, 583, 595, 15, 618, 619 
Pontederia, 325 Sarracenia, 327, 331-335, 342 
Populus, 10, 12, 99, 143, 581 Sassafras, 582 
Poria, 112, 231 Schistochila, 545 
Porodiscus, 423, 432-434 Schizachyrium, 370, 372 
Potentilla, 147, 582, 605 Schizaea, 671 
Protophyllocladus, 439-442 Scindalma, 301 
Prunus, 109, 112, 113, 335, 336, 504, 506, | Scirpus, 322, 323, 325 
507, 510, 511, 578, 582 Scleria, 294, 323 
Pseudoleskea, 478, 479 Scutellaria, 492-494 
Psidium, 120 Scutellinia, 89, 90 
Psilothecium, 85, 86 Scutiger, 423, 425-432 
Psilotum, 682 Scytopezis, 87 
Pteridium, 350, 676 Sedum, 306 
Pteris, 350, 676 Selaginella, 666, 682 
 Pterogonium, 473, 476, 478 Selliguea, 674, 675 
Puccinia, 4—6, 8, 16 Senebiera, 175 
Pycnolejeunea, 557 Senecio, 88 
Pyrenula, 413, 414 Sepedonium, 99 
Sepultaria, 91 
Serenoa, 324 
Setaria, 384 
Shepherdia, 226, 228 
