INDEX AXD GLOSSARY 



687 



Palm-type of structure of stem, 49 

 (Figs. 29, 30) ; obconical base of, 

 590 (Fig. 440, B). 



Palmella-state, of Euglena, 358, 362. 



Panicle, an indefinite inflorescence in 

 which each pedicel branches, bear- 

 ing several flowers, 261 (Fig. 183). 



Papaver (Poppy), 625 (Fig. 476), 

 P. somniferum, 626. 



Papaveraceae, 625. 



Papilionaceae, 635. 



Pappus, feathery bristles representing 

 the calyx in the Compositae, 326 

 (Fig. 247), 648-652. 



Parallel-development, 192 ; in Algae, 



375- 

 Parallel venation of Monocotyledons, 



72. 

 Paraphyses of Mushroom, 445. 

 Parasite, and host, 220 ; an organism 



that derives organic supply from 



some other living organism, 220 ; 



partial, 222 ; complete, 223. 

 Parasitic habit of Fungi, 391 (Chap. 



xxiv.). 

 Paratrophic bacteria, 451. 

 Parenchyma, cells roughly oblong in 



form, and not much longer than 



broad, 23 (Figs. 12, 13, 16), 73 (Fig. 



48). 

 Parietal cells, which form inner wall 



of pollen-sac, 284 (Fig. 205). 

 Parmelia, 428 (Fig. 326). 

 Parsnip, origin and analysis of, 655. 

 Parthenogenesis, somatic and gener- 

 ative, 587. 

 Partial parasites, those which are only 



partly dependent on parasitism for 



nutrition ; they are usually green, 



221. 

 Pastinaca sativa (Parsnip), 655. 

 Pea (Pisum sativum), analysis of, 



655 ; origin of, 656 ; root-tip of, 89 



(Fig. 64, B) ; tendril, 216. 

 Pea Xut or Monkey Nut (Arachis 



hypogaea), analysis of, 655 ; origin 



of, 656. 

 Peach, analysis of, 657 ; perigynous 



flowers of, 272 (Fig. 196). 

 Peach Leaf Curl, 396. 

 Pear, analysis of, 657. 

 Peat, origin of, 465. 

 Pedicel, a flower-stalk of a higher 



order of branching, 260. 

 Peduncle, a flower stalk, 258. 

 Pelargonium, 628. 

 Pellaea, root of, 492 (Fig. 382). 

 Pellagra, 663. 



Pellia, capsule of, 475 (Fig. 371). 

 Pelvetia, 386. 



b.b. 2X 



i '' nicillin, 453. 



Penicillium, 418, 422, 453 (Fig. 320). 



Pentacyclic, of flowers, with five 

 cycles of parts, 268. 



Pentacyclicae, gamopetals with five 

 cycles of floral parts, 639. 



Pentamerous, or 5-merous, flowers, 

 with parts in whorls of five, 265. 



Peppercorn, perisperm of, 317 (Fig. 

 236). 



Perennation, persistence from season 

 to season, 195. 



Pericarp, product of carpellary wall ; 

 in Wheat, 658. 



Perichaetium, of Mosses, leaves sur- 

 rounding the sexual organs, 467. 



Pericycle, tissue immediately within 

 the endodermis, forming a peri- 

 pheral band of the stele, 45 (Fig. 

 23), 56 (Fig. 34), 84 (Fig. 58) ; in 

 Ferns, 488 (Figs. 377, 378). 



Perigynium, a bract enveloping the 

 female flower in Carex, 616 (Fig. 

 463). 



Perigynous, of flowers, where the 

 receptacle is laterally enlarged, 

 forming a cup on the margin of 

 which the sepals, petals and 

 stamens are seated : 272 (Fig. 196). 



Periplasm, protoplasm surrounding 

 the ovum ; in the oogonium of the 

 Peronosporeae, 411 (Fig. 310). 



Perisperm, tissue of the nucellus 

 persistent in the ripe seed, 317 

 (Fig. 236). 



Peristome, in Mosses, a mechanical 

 structure surrounding the lip of 

 the dehiscent capsule, which is 

 effective in scattering the spores, 

 471 (Fig. 367). 



Perithecia, flask-shaped cavities filled 

 with asci, in the fruits of some 

 Ascomycetes : 420 (Fig. 318), 421 

 (Fig. 319). 



Permeable membrane, 35. 



Peronospora, sexual organs in, 410 

 (Fig. 310). 



Peronosporeae, 399 : sexual organs 

 of, 410 (Fig. 310). 



Personatae, 643. 



Petals, the parts constituting the 

 inner floral envelope, or corolla, 

 255 ; structure of, 280 (Fig. 200). 



Petiole, the leaf-stalk, 70 (Fig. 45), 



348. 

 Peziza, 401, 418, 425 (Fig. 322). 



Phaeophyceae, 355, and Chap, xxiii. 



Phagocytes, 452. 



Phajus, leucoplasts of, 130 (Fig. 



85). 



