INDEX AND GLOSSARY 



569 



Pea Nut or Monkey Nut (Arachis 

 hypogaea), analysis of, 542 ; origin 

 of, 543- 



Peach, analysis of, 544 ; perigynous 

 flower of, 238 (Fig. 186). 



Pear, analysis of, 544. 



Peat, origin of, 358. 



Pedicel, a flower-stalk of a higher 

 order of branching, 225. 



Peduncle, a flower-stalk, 224. 



Pelargonium, 515. 



Pellaea, root of, 334 (Fig. 273). 



Pellia, 365 ; capsule of, 367, 368 

 (Fig. 312). 



Pelvetia, 385. 



PenicilHum, 433 (Fig. 366), 439. 



Pentacyclic, of flowers with five 

 cycles of parts, 233. 



Pentacyclicae, gamopetals with five 

 cycles of floral parts, 525. 



Pentamerous, with parts in whorls of 

 five, 231. 



Peppercorn, perisperm of, 381 (Fig. 

 223). 



Perennation, persistence from season 

 to season, 163. 



Pericarp, product of carpellary wall : 

 in Wheat, 545. 



Perichaetium, of Mosses, leaves sur- 

 rounding the sexual organs, 360. 



Pericycle, tissue immediately within 

 the endodermis, forming a peri- 

 pheral band of the stele, 37 (Fig. 

 23). 47 (Fig. 33), 73 (Fig. 55) '. 

 in Ferns, 331 (Fig. 270). 



Perigynium, a bract enveloping the 

 female flower in Carex, 502. 



Perigynous, of flowers, where the 

 receptacle is laterally enlarged, 

 forming a cup on the margin of 

 which the sepals, petals, and 

 stamens are seated : 238 (Fig. 186). 



Periplasm, protoplasm surrounding 

 the ovum, in the oogonium of the 

 Peronosporeae, 420 (Fig. 357). 



Perisperm, tissue of the nucellus 

 persistent in the ripe seed, 381 

 (Fig. 223). 



Peristome, in Mosses, a mechanical 

 structure surrounding the lip of 

 the dehiscent capsule, which is 

 effective in scattering the spores, 

 362, 364 (Fig. 308). 



Perithecia, flask-shaped cavities filled 

 with asci, in the fruits of some 

 Ascomycetes : 431 (Fig. 364), 432 

 (Fig. 365). 434 (Fig. 367). 



Peronospora, sexual organs in, 420 



(Fig. 357)- 

 Peronosporeae, 410, sexual organs 



of, 422 (Fig. 357). 

 Personatae, 493, 529. 

 Petals, the parts constituting the 



inner floral envelope, or corolla, 



221 ; structure of, 244 (Fig. 190). 

 Petiole, the leaf-stalk, 58, 59 (Fig. 42). 

 Peziza, 429. 



Phaeophyceae, 372, 377, Chap. xxiv. 

 Phaeosporeae, 379. 

 Phagocyte, 200. 

 Phagocytosis, the process of digestion 



of intrusive organisms by a cell or 



cells (Phagocytes), 203, 207. 

 Phalaenopsis, mycorhiza in, 199 



(Fig. 150). 

 Pharbitis, sinistrorse twining stem of, 



182 (Fig. 135). 

 Phaseolus vulgaris (French or Haricot 



Bean), analysis of, 542 ; origin of, 



543- 



Pheasant's eye, 492, 496. 



Phelloderm, the inner product of 

 cork-cambium, 55 (Figs, 40, 41). 



Phellogen, the cambium that pro- 

 duces cork, 55 (Figs. 40, 41). 



Phloem, the bast-region of the 

 vascular strand, 37, 39, 41, 42 

 (Figs. 26, 27, 28) ; of Fern, 332 

 (Figs. 270, 272). 



Phloem-parenchyma, 42 (Fig. 26), 50 



(Fig. 37)- 



Phormium, leaf-structure of, 155 

 (Fig. 115.^). 



Phosphorus, necessary to form pro- 

 teids, 105 ; supply of, 107, 



Photo-synthesis, construction of new 

 organic material under the influ- 

 ence of light in green parts : 98 ; 

 activity of on a summer's day, 105 ; 

 salts supplied for, 93 ; source of 

 organic substance, 116. 



Phragmidium, apogamy in, 44S (Fig. 



384). 

 Phycoerythrin, 372, 

 Phycomyces, 423, 426. 

 Phycomycetes, 403, 412, 413 (Chap. 



xxvii.) ; origin of, 421 ; subaerial 



adaptation of, 454. 

 Phycophaein, 372. 

 Phyllanthus, 515. 

 Phyllosiphon, 403, 421. 

 Physiological drought, a deficiency 



of water due to inability of the 



plant to absorb enough to replace 



