IX'DKX 



212; Torreya, 218; Pinus, 2251 2*6 1 

 Ephedra, 2,30", 237; angiosperms, --71 



Prog< otropism, 400. 



Promycelium, £j. 



Prosenchyma, 1 1 2. 



Protective tissues, 318. 



Protein enzymes, 401. 



Proteins, 361, 39] ; synthesis of, 377. 



Prothallial tubes, Tumboa, 235. 



Prothallium, 165, 166. 



Protoascales, 70. 



Protobasidiomycetes, Sr. 



Protococcales, 20 ; conclusions, 24. 



Protodiscales, 71. 



Protonema, 1 15, 116. 



Protoplast, 7, 207 ; work of, 298. 



Protosiphon, 34. 



Protostele, 125, 157, 139. 



Protoxylem, 157. 241. 



Pseudopodium, slime molds, 2; mosses, 



113, //./. "S- 

 Psilotales, 142. 

 Psilotum, 142, 143. 

 Pteritlophytes, 122. 

 Pteris, stem section, 161. 

 Pucdnia, 82, 83, 84, 85. 

 Puffballs, 00. 

 Pulque, 334. 

 Pulvinus, 452. 



Purslane, photeolic movements, 455. 

 Putrefaction, 355, 411. 

 Pycnidia, 83. 

 I'y< nidiospores, 83. 

 Pyrenoid, 16, 30, 40. 

 Pyrenomycetales, 75. 

 Pyronema, 72, 73. 



Quillworts, 138. 



Radial bundles, 248, 24Q. 



Ramentum, 185. 



Ranales, 279. 



Ranunculus, nectar gland, 330; root section, 



2 n- 



Ray Bowers, 282. 



Reaction, mechanism, 431; modes, 428; 

 time. 433. 



Receptat le, flower, 253 ; Man hantia, 99. 

 Red algae, 54. 

 Regular flowers, 256. 

 Reproduction, 481. 

 Resins, 413. 



Respiration, t.\; : aerobic and anaerobic, 

 404; products, 4011; rule of oxygen, 



400. 

 Reversible ai tion, 109, 

 Revolution, twiners, 40S. 



Rheotropi n 



Rhipsalis, chloroplasts, 376. 

 Rhizopus, 67. 

 Rhodophyceae, 54. 



94, 95, 96, 97- 

 Riii iaceae, 93 ; con< lusions, 96. 



I\i. I k>l ,11 [HI-., i) ;. 



Kuiniis, endosperm 1 ell, 392; stem section, 

 -'./-'. 346. 



RingleSS terns, 155. 



Rivularia, 8, 9. 



Rockweed, 10. 



Km., 1. angiosperm, 247, 248, 249; branches, 

 248; cap, 246, j 17. f6s; diffusion from, 

 353; effect on soil, 315; hair>, J47, 248, 

 ji2] permeable regions, ;n ; "pressure," 

 336; pt endophytics, 122, 1.50, 131, 137, 

 1 /'■ 163, 168; system, 311 ; tip, 247. 



Roripa, rootcap, i f >5- 



Rosales, j.So. 



Rotation, ( linostat, 462; twiner, 468. 



Rubiales, 282. 



Rusts, 82, 83, 84, 85. 



Saccharomycetes, 70. 



Saccharose, 359. 



Sac fungi, 70. 



Sagittaria, embryo, 273, 274, 275. 



Salix, megasporangium, 262. 



Salts, and transpiration, 325; and water- 



proofing, ,w~. 

 Salvinia, /,-/. 

 Salviniaceae, 171. 

 Sa[> pressure and turgor, 311. 

 Saprolegnia, 64. 

 Saprolegniales, 63. 

 Saprophytes, 2, 61, 384. 

 Sargassum, 52, 53. 

 Sarracenia, iS'>. 

 Scalariform vessels, 241, 244. 



Scale mosses, 101. 



Scenedesmus, 21. 



Sceptridium, 149. 



Schizaeaceae, 155. 



S( hizomyi etes, 10. 



Schizophyceae, 4. 



Schizophytes, |. 



Si itaminales, 278. 



s< lerodermales, <.*>. 



Sclerotium, 2, 77. 



Scouring rushes, 143. 



Si 5 tonem 



Secondary sylem, 241, 144, J45. 



Se. retion, , ,.■. 1 .7 ; emission, 338. 



Sedum, stoma, 



Seeds, r8o, r*2, 183, 188, 189, 212, 23a; 



loss of, 355. 

 Seed plants, 1S0. 



