INDEX 



345 



Pome, 263. 



Pondweeds, 237. 



Poplars, 255. 



Popowia, 198. 



Poppy, 261. 



Poppy family : see Papaveraceae. 



Populus, 256. 



Pore-fungus, 72. 



Potamogeton, 237, 238. 



Potato : see Solanuin. 



Potentilla, 225, 262. 



Proteid, 302. 



Prothallium, 130, 132, 134. 



Protococcus forms, 22. 



Protonema, 95, 98. 



Protoplasm, 7. 



Prunus, 218, 262. 



Pseudomonas, 76. 



Pseudopodium, 105, 123, 124. 



Pteridophytes, 2, 128, 172, 291. 



Pteris, 133, 134, 135, 137, 141, 142, 



143, 145, 281, 291, 292, 293. 

 Ptilota, 42. 



Puccinia, 63, 64, 65, 66. 

 Puff-balls, 68, 74. 

 Pulvinus, 308. 



Q 



Quillwort : see Isoetes. 



R 



Rabdonia, 41. 

 Radiate bundle, 294. 

 Radicle, 209. 

 Radish, 120. 



Ragweed : see Ambrosia. 

 Ranunculaceae, 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, 164. 



Rhododendron, 270, 271. 



Rhodophyceae, 6, 38. 



Riccia, 104, 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. 



Rosaceae, 262. 



Rose family : see Rosaceae. 



Rosin- weed : see Silphium. 



Rosmarinus, 275. 



Royal fern : see Osmunda. 



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. 



