690 



BOTANY OF THE LIVING PLANT 



Pro-embryo, the first filamentous 

 development from the zygote in 

 Seed-Plants, 311 (Fig. 230, i.) ; of 

 Monocotyledons, 314. 



Progametangia of Mucor, 416. 



Promycelium, of Puccinia, 435 (Fig. 



335). 



Propagation, irregular, 587 ; vegeta- 

 tive, Chap. xiii. 



Propagative cells of Fungi : ter- 

 minology, 401. 



Protandrous, term applied where in 

 the flower the stamens mature 

 before the stigmas, 301. 



Proteases, 127-129. 



Proteins, 32, synthesis of, 126 ; 

 storage of, 126 (Figs. 84, 85). 



Proteolytic ferment, which breaks 

 down complex protein into simpler 

 substances, 240. 



Prothallus, (female) of Pine, 535 (Fig. 

 423), 513 ; male of Selaginella, 

 517 (Fig. 411) ; female, 518 (Fig. 

 412) ; of Fern, 499 (Figs. 391, 392) ; 

 retention on parent plant, 509, 549. 



Protista, 393. 



Protococcus, 2 (Fig. 1), 364, 365 (see 

 Pleurococcus). 



Protogynous, applied where stigmas 

 are receptive before the pollen of 

 the same flower is shed, 301. 



Protonema, preliminary filamentous 

 stage of Mosses, 462 (Figs. 356, 



357)- 

 Protophyta, 360, 361, 375. 



Protoplasm or protoplast, the living 

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

 continuity of , 26 (Fig. 16) ; stream- 

 ing of, 30, 31, 167 ; the ultimate 

 receiver of stimuli, 139, 153. 



Protostele, a stele with a solid xylem- 

 core, 485 (Fig. 375), 593. 



Prototrophic bacteria, 450. 



Protoxylem, the first formed elements 

 of the wood, 47 (Fig. 24) ; in root, 

 84 (Figs. 58, 59) ; in root after 

 secondary thickening, 92 (Figs. 66, 

 67) ; in Fern, 488 (Figs. 377, 



378). 

 Protozoa, in soil, 98. 



Prunus cerasus (Cherry), 633 (Figs. 

 484, C, 486). 



Psalliota (Agaricus), campestris, 401, 

 442 (Figs. 341, 343, 344) ; sapro- 

 phytic habit of, 443. 



Psaronius, concentric stelar rings of, 

 598. 



Pseudomixis, a fusion of nuclei which 

 initiates a sporophyte, but not by 

 regular syngamy, 509 (Fig. 403). 



Pseudo-monocotyledonous embryos, 

 where in Dicotyledons by abortion 

 or fusion only one cotyledon ap- 

 pears, 313. 



Pseudo-parenchyma, of Fungi, 394. 



Psilophytales, 352, 353 B, 478. 



Psilotales, 480. 



Psilotum, mycorrhiza in, 210 ; stele 



of, 594- 



Pteridium (Bracken), meristeles of, 

 486 (Fig. 376), 488 (Figs. 377, 378) ; 

 tracheites of, 490. 



Pteridophyta, the higher Arche- 

 goniate plants, including Ferns, 

 Club Mosses, Horse tails, etc., 3, 

 481 (Chaps, xxxi., xxxii.) ; com- 

 pared with Seed Plants, 539. 



Pteridosperms, 521. 



Pteris, root apex of, 493 (Fig. 385) ; 

 P. cretica, apospory in, 507 (Fig. 

 401) ; P. podophylla, concentric 

 vascular rings of, 597 (Fig. 453). 



Puccinia caricis, 433. 



Puccinia graminis (Rust of Wheat), 

 398, 401, 433 (Figs. 329, etc.). 



Puff-balls, 429. 



Pulpy fruits, 329. 



Pulvini, 162. 



Pure line, a genetically uniform popu- 

 lation, the offspring of a single self- 

 fertilised homozygous individual, 

 586. 



Pylaiella, 381. 



Pyrenoid, 361. 



Pyrenomycetes, 425. 



Pyrus malus (Apple), 632 (Fig. 484). 



Pythium, attack on cress-seedling, 

 396, 399, 4 OI > 4°2 (Fig. 300) ; 

 hyphae of, traversing host-plant, 

 403 (Figs. 301, 302) ; sporangia 

 of, 404 (Fig. 303) ; oospores of, 405 

 (Fig. 304) ; fertilising tube of, 



405- 



Quillaija, floral construction of, 



267. 

 Quince, flower of, 255 (Fig. 177), 290 

 " (Fig. 212), 632. 

 Quotient, respiratory, 136. 



Raceme, an indefinite inflorescence in 

 which each pedicel bears one flower, 

 260 (Fig. 182). 



Rachis, 348. 



Radial construction of stele, as seen 

 in roots with protoxylem external, 

 and alternating wood and bast, 84 

 (Figs. 58, 59). 



