INDEX 



345 



Pome, 263. 



Pondweeds, 237. 



Poplars, 255. 



Popowia, 198. 



Poppy, 261. 



Poppy family: see PapaveracciT. 



Populus, 256. 



Pore-fungus, 72. 



Potamogeton, 237, 23S. 



Potato : see Solanum. 



Potentilla, 225, 262. 



Proteid, 302. 



Prothallium, 130, 132, 134. 



Protococcus forms, 22. 



Protonema, 95, 98. 



Protoplasm, 7. 



Prunus, 213, 262. 



Pseudomonas, 76. 



Pseudopodium, 105, 123, 124. 



Pteridophytes, 2, 128, 172, 291. 



Pteris, 133, 134, 135, 137, I4I, I42, 



143, 14s, 281, 291, 292, 293. 

 Ptilota, 42. 



Puccinia, 63, 64, 65, 66. 

 Puff-balls, 68, 74. 

 Pulvinus, 308. 



Quillwort : see Isoetes. 



R 



Rabdonla, 4I. 

 Radiate bundle, 294. 

 Radicle, 209. 

 Radish, 120. 



Ragweed : see Ambrosia. 

 RanunculaceJB, 261. 

 Ranunculus, 222. 259. 

 Raspberry : see Rubus. 

 Rays, 275, 276. 

 Receptacle, 222. 

 Red algae, 6, 38. 



Redbud : see Cercis. 



Redwood : see Sequoia. 



Reproduction, 3, 8, 309. 



Respiration, 302. 



Rheotropism, 307. 



Rhizoid, 109, 110, 134. 



Rhizophores, I64. 



Rhododendron, 270, 271. 



Rhodophycea% 6, 38. 



Riccia, I04, 110. 



Ricciocarpus, 110. 



Ricinus, 288. 



Robinia, 265. 



Root, 138, 217, 293, 294, 313. 



Root-cap, 293. 



Root-fungus, 87, 88. 



Root-hairs, 217, 300. 



Root-pressure, 300. 



Root-tubercles, 89. 



Rosacea% 262. 



Rose family : see Rosaceae. 



Rosin-weed : see Silphium. 



Rosmarinus, 275. 



Royal fern : see Osraunda. 



Rubus, 262. 



Rumex, 284. 



Rust, 62, 63, 64, 65, 66. 



Sac-fungi, 57. 

 Sage: see Salvia. 

 Sage-brush : see Artemisia. 

 Sagittaria, 208, 338. 

 Salix, 219, 233, 256, 257. 

 Salvia, 275. 

 Salvinia, 158. 

 Saprolegnia, 51, 52. 

 Saprophyte, 48, 84. 

 Sap-wood, 289. 

 Sargassum, 35, 36. 

 Saururus, 219, 258. 

 Scales, 161. 



