INDEX AND GLOSSARY 



5/1 



Polysiphonia, alternation in, 4S1, 482; 

 P. fastigiata, 403. 



Polystichum, aposporv in, 349 (Fis;. 

 292). 



Polytrichum, conducting tissue of. 

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

 of. 35 7 (Fig- 300) : perichaetia of, 

 360. 



Poplar, adventitious buds on root, 

 214 (Fig. 162). 



Poppy (Papaver), 511 (Fig. 41S) ; 

 pore capsule of, 2S9 {Fig. 231). 



Populus alba, adventitious buds on 

 root, 214 (Fig. 162) ; tremula, 

 lamina of, 61 (Fig. 43). 



Porogamy, where in Seed-Plants 

 fertilisation is tlirougii 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, 1S4 (Fig. 138) ; 

 leukoplasts of, no (Fig. 79); 

 early' formation of tubers in, 211 

 (Fig. 159) ; vegetative propaga- 

 tion of, 213 (Figs. 13S, 159) ; 

 tissue attached by Pythium, 414 

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

 435) ■ ori.gin of, 540 ; anah'sis of, 



541- 



Potato-disease (Phytophthora in- 

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

 33'5). 



Potentilla, floral construction of, 233 

 (Fig. 1S2), 520 (Fig. 426, B). 



Potometer, an instrument for measur- 

 ing the absorption of water, 87. 



Primary.- phloem, bast formed ^\-ithout 

 cambial acti\-ity, 49 (Fig. 36). 



Primary xylem, wood formed with- 

 out cambial acti\-ity, 49 (Fig. 36). 



Primordial cell, a naked protoplast, 

 137 (Fig. 97, A). 



Primrose (Primula vulgaris), 526 



(Fig. 434)- 

 Primulaceae, meristic difterences in, 



231 ; 526 (Fig. 434). 

 Primulales, 493, 526. 

 Producti\ity, by seeds, 290, 297. 

 Pro-embryo, the first fllamentous 



development from the zygote in 



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



of INIonocotj-ledons, 277. 

 Pro-m^-celium, of Puccinia, 446 (Fig. 



381). 



Propagation, irregular, 477 ; vegcta- 



ti\'e. Chap. xii. 

 Protandrous, term applied where in 



the flowerthestamensmature before 



the stigmas, 265. 

 Proteid, construction of, 105, 107 ; 



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

 Proteolytic ferment, which breaks 



down complex proteid into simpler 



substances, 207, 209. 

 Prothallus, female of Pine, 310 (Fig. 



-53) '• 314 '• male of Selaginella, 



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



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



2S3) ; retention on parent plant, 



485- 



Protococcales, 391. 



Protococcus, 2 (Fig. i), 390. 



Protogsmous, applied where stigmas 

 are receptive before the pollen of 

 the same flower is shed, 265. 



Protonema, preliminarj' filamentous 

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

 Sj^, 35S. - 



Protoplasm or protoplast, the li\ing 

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

 continuity of, 30 (Fig. 19) ; the 

 ultimate recei\"er of stimuli, 126, 

 127, 12S. 



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. 53) : in root after second- 

 ary thickening, ^2 (Fig. 63, 64) ; 

 in Fern. 332. 



Prunus cerasus (Cherry), 69, 321 

 (Figs. 426, C; 429). 



Psalhota (Agaricus), campestris, 451 

 (Fig. 38 7) ; saprophytic habit of, 



452- 



Pseudomixis, a fusion of nuclei which 

 initiates a sporophj'te, but not hy 

 regular syngam)-, 350 (Fig. 294), 



Pseudo-ilonocotjdedonous embryos, 

 where in Dicotyledons by abortion 

 or fusion onlv one Cot^dedon ap- 

 pears, 277. 



Pseudo-parenchyma, of Fungi, 405. 



Psilotum, mycorhiza in, 197. 



Pteridium (Bracken), meristeles of, 

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

 tracheides of, 332, 271. 



Pteridophyta, the higher Archegoniate 

 plants, including Ferns, Club-mosses, 

 Horse-tails, etc., 3, 316. 



