Rhodochaetaceae, 338 
Rhodochaetales, 338 
Rhododendron, 365 
Rhodomela, 339 
‘Rhodomelaceae, 339 
Rhodophyceae, 205, 338 
Rhodophyllidaceae, 339 
Rhodophyllis, 339 
Rhodymenia, 339 
Rhodymeniaceae, 339 
Rhodymeniales, 339 
Rhoedales, 364 
Rhus, 372 
Rhytisma, 341 
Ribes, 309, 369 
Riccia, 244, 348 
Ricciaceae, 348 
Ricciales, 348 
Riccias, 348 
Rice Grasses, 359 
Ricinoleic acid, 143 
Ricinus, 305, 363 
Ringed vessels, 36 
River-weeds, 357 
Rivularia, 331 
Rivulariaceae, 165, 331 
Rivularias, 165 
Robinia, 369 
Roccella, 342 
Roccellaceae, 342 
Rockweeds, 201, 337 
Root (thickened), 320 
-apples, 307 
Round Diatoms, 181, 333 
Rubiaceae, 373 
Rubiales, 373 
Rubus, 291 
Rudbeckia, 315, 375 
Ruderal plants, 320 
Runners, 319 
Rushes, 358 
Russian Thistle, 325 
Russula, 345 
Rusts, 232, 347 
Ruta, 363 
Sabal, 300 
Sabiaceae, 371 
Saccharomyces, 223, 344 
Saccharomycetaceae, 344 
Saccharose, 17, 146 
Sac-Fungi, 213 
Sachs’s solution, 98 
Sac-spores, 213 
Sage, 304 
Sagittaria, 291, 357 
Salicaceae, 364 
Salicin, 149 
Salicylic acid, 141 
Salix, 364 
Salsola, 365 
Salvadoraceae, 366 
Salvia, 304, 305, 367 
Salvinia, 259, 353 
Salviniaceae, 353 
Sambucus, 315, 373 
Santalaceae, 371 
Sapindaceae, 371 
Sapindales, 371 
Sapindus, 371 
Saponin,148 
Sapotaceae, 366 
Saprolegnia, 186, 335 
Saprolegniaceae, 186, 335 
Saprolegniales, 335 
Scalariform vessels, 36 
Scale Mosses, 247, 349 
