INDEX. 



255 



Plumule, 141, 180, 192 



Pod, 205 



Pollen, 138, 158, 169, 178, 189, 



190, 194, 203, 213, 227, 234 

 Pollen sac, 138, 157, 194 

 Pollen tube, 169, 235, 241 

 Pollination in Pinus, 164 

 Polytrichum 85 

 Pond scum, 33 

 Potassic chlorate, 6; hydrate, 5, 



13 



Primary meristem, 151, 206 

 Primordial utricle, 40 

 Pro embryo, 235, 242 

 Prothallia, 104, in, 121, 128, 



168, 194, 241 

 Protococcus, distribution of, 22; 



gross and minute anatomy, 23; 



annotations, 25 

 Protonema, 86, 90, 102 

 Protoplasm, test for, 24, 25; in 



the cell, 40; in pollen, 158 

 Pteridoid stage, 128 

 Punctum vegetationis, 219 

 Pyrenoid, 37, 40 



RADIAL bundle, 117, 126, 195, 218 



Radish flowers, 43 



Raphides, 201, 233 



Razor, kind to use, 2; care of, 9 



Reagents, 4; use of , 13 



Receptacle, 60, 64, 71, 74, 87, 



202, 226 



Reference books, 19 

 Resin-ducts, 135, 143, 145, 148 



153, 155, 167 



Resting spores, 42, 49, 56 

 Rhachis of leaf, 107; of spikelet, 



177 



Rhaphe, 205 

 Rhizoids, 61, 79, 86, 90, in, i?2 



Rhizome, 105 



Rhizotaxy, 223 



Roots,- 79, 105, 116, 124, 173, 



219, 238 

 Root cap, 107, 118, 124, 174, 182, 



205, 238 



Root-hairs, 97, 107, 118, 174, 206 

 Root-sheath, 180, 192 

 Root-stock, 198, 199, 207, 218 



SCALARIFORM VCSSels, 133, JI4, 



"7 



Scale leaves of Atrichum, 87; of 

 Pinus, 132, 137, 146, 149, lefc; 

 of Trillium, 200, 201, 218 



Scales (trichomes) on rhizome, 

 105, 107. 116; on thallus, 60, 

 62, 79 



Sclerenchyma, in, 115 



Scotch pine, 130 



Scutellum, 180, 192 



Section cutting, 8 



Seed, 141, 170. 205, 215, 227, 236 



Selaginella, 168 



Sepals, 202, 2ii, 226, 233 



Seta, 86, 89, 95, 100 



Sexuality, simplest form of, 42; 

 significance of, 51 



Sexual process, 41 



Sheath of filament, 30, 31, 36, 39; 

 of leaf, 175, 188; of resin duct, 

 143; of root, 1 80. 192; of root- 

 stock, 208, 220; of bundle see 

 Bundle sheath 



Shepherd's-purse, 222 



Sieve cells, 113, 115, 144, 148, 

 165; plates, 115, 126, 145, 165; 

 tissue, 207, 209 



Sori, 44, no 



Sperm-cell, 122 



Spike, 139 



