INDEX AND GLOSSARY 



5/1 



Polysiphonia, alternation in, 481, 482; 

 P. fastigiata, 403. 



Polystichum, apospory in, 349 (Fig. 

 292). 



Polytrichum, conducting tissue of, 

 257 (Fig. 299), 370 ; leaf-structure 

 of. 357 (Fig- 300) : perichaetia of, 

 360. 



Poplar, adventitious buds on root, 

 214 (Fig. 162). 



Poppy (Papaver), 511 (Fig. 418) ; 

 pore capsule of, 289 (Fig. 231). 



Populus alba, adventitious buds on 

 root, 214 (Fig. 162) ; tremula, 

 lamina of , 61 (Fig. 43), 



Porogamy, where in Seed-Plants 

 fertilisation is through the micro- 

 pyle, 270 (Fig. 214 bis). 



Porotrichum, aquatic habit of, 355. 



Posterior, side of a flower next the 

 axis, 229. 



Potassium, absence of, 94 (Fig. 70). 



Potato, cortex of, 35 (Fig. 22) 

 correlation in, 184 (Fig. 138) 

 leukoplasts si, no (Fig. 79) 

 early formation of tubers in, 211 

 (Fig. 159) ; vegetative propaga- 

 tion of, 213 (Figs. 138, 159) ; 

 tissue attached by Pythium, 414 

 (Fig. 349) ; flower of, 529 (Fig. 

 435) ; origin of, 540 ; analysis of, 



541- 



Potato-disease (Phytophthora in- 

 festans), 406 ; 416, 421 (Figs. 352- 

 356). 



Potentilla, floral construction of, 233 

 (Fig. 182), 520 (Fig. 426, B). 



Potometer, an instrument for measur- 

 ing the absorption of water, 87. 



Primary phloem, bast formed without 

 cambial activity, 49 (Fig. 36). 



Primary xylem, wood formed with- 

 out cambial activity, 49 (Fig. 36). 



Primordial cell, a naked protoplast, 

 137 (Fig. 97.^)- 



Primrose (Primula vulgaris), 526 

 (Fig. 434)- 



Primulaceae, meristic differences in, 

 231 ; 526 (Fig. 434). 



Primulales, 493, 526. 



Productivity, by seeds, 296, 297. 



Pro-embryo, the first filamentous 

 development from the zygote in 

 Seed-Plants, 274 (Fig. 217, i.) ; 

 of Monocotyledons, 277. 



Pro-mycelium, of Puccinia, 446 (Fig. 

 3S1). 



Propagation, irregular, 477 ; vegeta- 

 tive. Chap. xii. 



Protandrous, term applied where in 

 the flower the stamens mature before 

 the stigmas, 265. 



Proteid, construction of, 105, 107 ; 

 storage of, 108 (Figs. 79, 80). 



Proteolytic ferment, which breaks 

 down complex proteid into simpler 

 substances, 207, 209. 



Prothallus, female of Pine, 310 (Fig. 

 253) ; 314 ; male of Selaginella, 

 321 (Fig. 264) ; female, 321 (Fig. 

 265) ; of Fern, 340 (Figs. 282, 

 283) ; retention on parent plant, 

 485- 



Protococcales, 391. 



Protococcus, 2 (Fig. i), 390. 



Protogynous, applied where stigmas 

 are receptive before the pollen of 

 the same flower is shed, 265. 



Protonema, preliminary filamentous 

 stage of Mosses, 355 (Figs. 297, 298), 

 356, 358- 



Protoplasm or protoplast, the living 

 body of the cell, 18 (Figs. 9, 12) ; 

 continuity of, 30 (Fig. 19) ; the 

 ultimate receiver of stimuli, 126, 

 127, 128. 



Protoplasmic control, 86. 



Protostele, a stele with a solid xylem- 

 core, 330 (Fig. 268). 



Protoxylem, the first formed elements 

 of the wood, 40 (Fig. 24) ; in root, 

 73 (Fig. 55) ; in root after second- 

 ary thickening, 82 (Fig. 63, 64) ; 

 in Fern, 332. 



Prunus cerasus (Cherry), 69, 521 

 (Figs. 426, C; 429). 



Psalliota (Agaricns), campestris, 451 

 (Fig. 387) ; saprophytic habit of, 

 452. 



Pseudomixis, a fusion of nuclei which 

 initiates a sporophyte, but not by 

 regular syngamy, 350 (Fig. 294). 



Pseudo-Monocotyledonous embryos, 

 where in Dicotyledons by abortion 

 or fusion only one Cotyledon ap- 

 pears, 277. 



Pseudo-parenchyma, of Fungi, 405. 



Psilotum, mycorhiza in, 197. 



Pteridium (Bracken), meristelcs of, 

 330 (Fig. 269), 331 (Fig. 270), 

 tracheides of, 332, 271. 



Pteridophyta, the higher Archcgoniate 

 plants, including Ferns, Club-mosses, 

 Horse-tails, etc., 3, 31O. 



