159 



Phyllophora, 12 

 Phyllosticta, 33 

 Physalis, 134 

 Physalodes, 134 

 Physostegia, 132 

 Physcia, 44 

 Physcomitrium, 5 2 

 Phytolacca, 90 

 Picea, 60 

 Pieris, 124 

 Pimpinella, 121 

 Pinus, 59 

 Placodium, 44 

 Plagiochila, 47 

 Plagiogramma, 22 

 Plantago, 1 39 

 Platanus. IOI 

 Platygyrium, 54 

 Pleonectria, 50 

 Pleuridium, 49 

 Pleurococcus, 5 

 Pleurostigma, 24 

 Pleurotaenium, 2 

 Pleurotus, 41 

 Plowrightia, 30 

 Pluchea, 30 

 Plumaria, 1 6 

 Poa, 67 

 Pogonatum, 53 

 Pogonia, 80 

 Polanisia, 100 

 Polyedrium, 5 

 Polygala, ill 

 Polygonatum, 78 

 Polygonella, 88 

 Polygonum, 87 

 Polyides, 16 

 Polypodium, 59 

 Polyporus, 38 

 Polysiphonia, 14 

 Polytrichum, 53 

 Pontederia, 75 

 Populus, 82 

 Porella, 48 

 Portulaca, 90 

 Porphyra, II 

 Potamogeton, 61 

 Potentilla, 103 

 Pottia, 51 

 Proserpinaca, 120 

 ProtomyceSy 28 

 Prunella, 132 

 Prunus, 105 

 Psalliota, 41 

 Pseudomonas, 27 

 Psilocarya, 70 

 Ptelea, III 

 Pteris, 59 

 Ptilimnium, 122 

 Ptilota, 16 

 Puccinia, 35 



Punctaria, 9 

 Pylaisia, 55 

 Pyrola, 1 23 

 Pyxilla, 26 

 Pyxine, 44 







UERCUS, 84 



RACOMITRIUM, 51 

 Radula, 48 

 Ramalina, 45 

 Ranunculus, 95 

 Raphanus, 98 

 Raphidium, 5 

 Reseda, 100 

 Reticularia, I 

 Rhabdonema, 21 

 Rhabdonia, 13 

 Rhamnus, 114 

 Rhaphidostegium, 55 

 Rhexia, 119 

 Rhizoclonium, 7 

 Rhizopus, 28 

 Rhizosolenia, 20 

 Rhodobryum, 52 

 Rhododendron, 124 

 Rhodomela, 14 

 Rhodora, 124 

 Rhodymenia, 13 

 Rhoicosphenia, 25 

 Rhus, 113 

 Rhytisma, 29 

 Ribes, 101 

 Riccardia, 47 

 Riccia, 47 

 Ricinus, 112 

 Rivularia, 19 

 Robinia, 107 

 Roestelia, 35 

 Roripa, 98 

 Rosa, 103 

 Rotala, 118 

 Rubus, 102 

 Rudbeckia, 151 

 Rumex, 87 

 Ruppia, 62 

 Russula, 40 

 Ruta, III 

 Rynchospora, 71 



CABBATIA, 127 

 ^ Sacidium, 34 

 Saccharomyces, 28 

 Saccogyna, 48 

 Sagina, 92 

 Sagittaria, 62 

 Salicornia, 89 

 Salix, 83 

 Salsola, 89 

 Sambucus, 140 



Samolus, 126 

 Sanguinaria, 97 

 Sanguisorba, 103 

 Sanicula, 12 1 

 Saponaria, 91 

 Sarcina, 26 

 Sargassum, II 

 Sarracenia, 100 

 Sarothra, 1 16 

 Sassafras, 96 

 Saururus, 8 1 

 Savastana, 64 

 Saxifraga, too 

 Scapania, 48 

 Scenedesmus, 5 

 Schizophyllum, 39 

 Scinaia, 12 

 Sciipus, 70 

 Scleranthus, 93 

 Scleria, 71 

 Scleroderma, 42 

 Scoliopleura, 24 

 Scropularia, 136 

 Scutellaria, 131 

 Sedum, 100 

 Selaginella, 59 

 Senecio, 154 

 Septonema, 32 

 Septoria, 34 

 Seriocarpus, 148 

 Sesuvium, 90 

 Sicyos, 142 

 Silene, 91 

 Silphium, 151 

 Sinapis, 97 

 Sisymbrium, 97 

 Sisyrinchium, 79 

 Sium, 122 

 Smilax, 78 

 Solanum, 135 

 Solidago, 146 

 Sonchus, 143 

 Sorbus, 104 

 Sparganium, 61 

 Spartina, 66 

 Spathyema, 74 

 Spergula, 93 

 Spermothamnion, 14 

 Sphacelaria, 9 

 Sphaerella, 4 

 Sphaerops.is, ^ 

 Sphaerotbeca, 29 

 Sphaerozosma, 3 

 Sphaerozyga, 18 

 Sphagnum, 49 

 Spiraea, 102 

 Spirodela, 74 

 Spirogyra, 4 

 Spirotaenia, 2 

 Spirulina, 18 

 Sporidesmium, 32 



