540 



INDEX 



Pyrenoid, 233. 

 Pyxidium, 209. 

 Pyxis, 209. 



Quercus, 226. 

 Quercus alba, 226. 

 Quercus coccinea, 226. 

 Quercus rubra, 226. 

 Quillworts, 229, 380. 

 Quince, 213, 437. 



Raceme, 148, 149, 153. 



Races, 494-497. 



Radiate pattern, 88. 



Radicle, 7, 13, 14. 



Ramie, 435. 



Ramie-hemp, 435. 



Ranunculaceae, 407. 



Ranunculus, 154, 204. 



Ranunculus acris, 155, 156. 



Raphe, 6, 201, 416. 



Raspberries, 47, 209-212, 436. 



Ray flowers, 146, 170. 



Receptacle, 143, 156, 163, 166, 211- 



213. 



Records, in plant breeding, 508. 

 Red algae, 261-265, 331. 

 Red alga;, uses of, 265. 

 Red bud, 440. 

 Red rust, 311, 313. 

 Red wood, 475. 

 Regular flowers, 146. 

 Reindeer "moss," 301, 302. 

 Reinforced fruits, 205, 212, 213. 

 Respiration, 97, 116-123. 

 Respiration, conditions of, 120; in 



fungi, 120; necessity for in growth, 



120. 

 Respiration in absence of oxygen, 



121. 



Resurrection plant, 219, 377, 463. 

 Rhabdonia, 264, 354. 

 Rhizobium leguminosarum, 128. 

 Rhizoids, 335, 348, 365. 

 Rhizome, 48, 358, 362, 363. 

 Rhizopus, 272. 

 Rhizopus nigricans, 274-279. 

 Rhodochytrium, 231. 

 Rhododendron catawbiense, 445. 

 Rhododendron maximum, 100, 101, 



142, 445. 



Rhodophycese, 228, 261. 

 Rhus hirta, 75. 

 Rhus typhina, 75. 



Riccia, 334, 341, 345. 



Rice, 426. 



Richardia, 180. 



Robinia, 440. 



Roccella, 303. 



Rock weed, 258-260. 



Roestelia, 319. 



Root cap, 35, 37. 



Root climbers, 46. 



Root hairs, 35-41. 



Root sheath, 13, 14. 



Root stock, 48. 



Root tubercles, 128-130. 



Root tubers, 34. 



Roots, adventitious, 14, 75. 



Roots, growth of, 25-29. 



Roots, kinds of, 33-34. 



Roots, motor zone, 26. 



Roots, perceptive zone in, 26. 



Roots, region of curvature, 26. 



Roots, structure of, 31-38. 



Root system, 31-33. 



Rosaceae, 436. 



Rose family, 436. 



Rose leaf, 81. 



Rosette, 88. 



Rosette plants, 480, 481. 



Rotate, 146. 



Royal fern, 370. 



Rubber plant, leaf of, 79. 



Rubiales, 448. 



Rudbeckia, 450. 



Rust fungi, 308-320. 



Rutaceae, 441. 



Rye, 425. 



Sac fungi, 287-304. 



Saccharomyces ceriviseae, 295, 297. 



Saccharum ofncinarum, 428. 



Sago palm, 396, 431. 



Salicales, 433. 



Salsify, 449. 



Salver-shaped, 146. 



Salvia, 193. 



Salvinia, 418. 



Samara, 206. 



Sambucus, 448. 



Sand strand, 481. 



Sap wood, 65. 



Saprolegnia, 280-282. 



Saprophyte, nutrition, 134, 138-141. 



Saprophytes, in, 134, 138-141, 



272, 292. 

 Saprophytic, 274. 



