199; sporangia, 216, 218, 

 219, 227. 



Polypodieae, 227. 



Polypodium, 199; stem, 208; 

 paleae, 216. 



Polypodium, 227. 



Polypodium aureum, apical 

 cell, 210 ; fundamental 

 tissue, 220; leaves, 208. 



Polypodium Lingua, stomata, 

 220. 



Polypodium punctatum, api- 

 cal cell, 210. 



Polypodium sporodocarpum, 

 growing point, 210. 



Polypodium vaccinifolium, 

 fundamental tissue, 221. 



Polypodium vulgare, funda- 

 mental tissue, 220 ; ger- 

 mination, 199; growing 

 point, 210; leaves, 208. 

 (Fig. 171.) 



Polyporus, hymenium, 132. 



Polysophonia variegata, 75. 



Polystichum angulare, var. 

 pulcherrimum, 208, note 2. 



Polytrichaceae, 186; capsule, 

 188; peristome, 186, 188; 

 rhizoids, 170; sporogo- 

 nium, 1 80; stem, 170. 



Polytrichum,antheridia, 174; 

 phyllotaxis, 166, 211; sex- 

 ual generation, 1 80; stem, 

 167. 



Polytrichum aloides, pro- 

 tonema, 172. 



Polytrichum nanum, proto- 

 nema, 172. 



Polytrichum piliferum, 188. 

 (Fig. 147.) 



Pomeae, 471. 



Pontederiaceae, 443, 444. 



Populus, increase in size, 450. 



Populus tremula, adventi- 

 tious shoots, 452. 



Pore-capsule, 429. 



Porocyphus, 124. 



Porphyra, 74 ; sexual propa- 

 gation, 77. 



Portulaceae, 468. 



Posterior (flower), 412. 



Potamogeton, embryo, 430; 

 flower, 439, note i ; inflo- 

 rescence, 411 ; phyllotaxis, 

 436 ; pollen, 405. 



Potentilla, floral diagram, 

 457;flower, 4 32.(Fig.3 4 8.) 



Potentilla, sp., Fig. 404. 



Poterieae, 47. 



Pottia, protonema, 163 ; 

 rhizoids, 171. 



Pottieae, sporogonium, 180. 



Preissia, air-chambers, 160; 

 branching, 163 ; fibres, 



145,160; receptacles, 1 60; 

 stomata, 1 60; thallus, 143, 



145, 160, 163. 



Primary cortex, 462. 



Primary root (Monocotyle- 

 dons), Fig. 333. 



Primary tapetal cell, 363, 

 note i. 



Primary tapetal layer, 363, 

 note i. 



Primine, 382. 



Primula, heterostyly, 405. 



Primulaceae, 47 1 ; floral dia- 

 gram, 457 and Fig. 397 ; 

 flower, 422; ovary, 376; 

 ovule, 305, 378. 



Primulineae, 471. 



Procarp, 7, 27, 73. (Fig. 5.) 



Pro-embryo (in Chara), 52 ; 

 (in Gymnosperms), 337; 

 (in Angiosperms), 396. 



Pro - embryonic branches 

 (Characeae), 56. 



Prolification, 303. 



Promycelium, 86, 127. 



Protandrous flowers, 405. 



Proteaceae, 471 ; floral for- 

 mula, 458 ; pollen - tube, 



367. 



Prothallium, 189, 197, etc. 



Protococcaceae, 27, 39 ; pro- 

 pagation, 28 ; structure, 

 28 ; subdivision, 39. 



Protococcus, 41, 126. 



Protococcus viridis, Fig. 84. 



Protogynous flowers, 405. 



Protomyces, 85. 



Protomyces macrosporus,85. 



Protonema, 146, 162. 



Pruneae, 471. 



Prunus, fruit, 429. 



Prunus domestica, 113. 



Prunus insititia, 113. 



Pseudaxis (sympodium), 409. 



Pseudocarp, 403, 426. 



Pseudopodium, 174, 184. 



Psilotaceae, 189, 196, 282. 



Psilotum, 274, 282, 283 ; 

 leaves, 298 ; sporangia, 

 191, 274, 283; stem, 298; 

 vascular tissue, 283. 



Psilotum triquetrum, 282. 



Pteris, 227 ; fundamental 

 tissue, 220; indusium, 217. 



Pteris aquilina, adventitious 

 buds, 212 ; growing point, 

 210; hair-structures, 215; 

 leaves, 209, 213; phyllo- 

 taxis, 210; roots, 208,214; 

 stem, 208; tissues, 220, 

 221, etc.; vascular bun- 

 dles, 222, etc. (Figs. 156, 

 157,160,170,172,173,179.) 



Pteris flabellata, Fig. 167. 



Pteris hastata, Fig. 162. 

 Pteris serrulata, Fig. 151. 

 Puccinia, 127; teleutospores, 



128. 



Puccinia Dianthi, 127, 128. 

 Puccinia graminis. See Ae- 



cidium Berberidis and 



Figs. 85, 86. 



Puccinia Malvacearum, 127. 

 Puccinia sessilis, 127. 

 Pullulation. See Sprouting. 

 Puschkinia, pollination, 307. 

 Putamen, 429. 

 Pycnidia, 103. 

 Pycnophycus, 72. 

 Pyrenomycetes, 103, 108. 

 Pyrola, embryo, 461. 

 Pyrola secunda, 446. 

 Pyrola umbellata, Fig. 04. 

 Pyrolaceae, 12. 

 Pyroleae, 471 ; endosperm, 



460. 

 Pyronema. See Peziza con- 



fluens and Fig. 62. 

 Pyrus, 131 ; perigynous 



flowers, 372. 

 Pyrus Mains, adventitious 



shoots, 452. 

 Pythium, 81, 92, 93, 96; 



propagation, 83, 99. (Fig. 



4.) 



Pythium de Baryanum, de- 

 velopment, 92 ; fertilisa- 

 tion, 95 ; mode of life, 81, 

 92 ; reproduction, 92. 



Pythium gracile, 95. (Fig. 

 58.) 



Pythium proliferum, 96. 



Pythium vexans, 81, 92. 



Pyxidium, 428. 



Quercus, cupule, 353; em- 

 bryo, 446 ; fruit, 426 ; 

 seed, 392, 44 6. 



Quercus Robur, Fig. 379. 



Raceme, 407. 



Racoblenna, 124. 



Racomitrium canescens, la- 

 teral shoots, 169. 



Racopilum, leaves, 168. 



Radial inflorescences, 406. 



Radicle, 448, 



Radula, antheridia, 141, 155 ; 

 archegonia, 141, 149, 155; 

 branching, 156; germina- 

 tion, 146 ; spores, 146 ; 

 vegetative body, 145. 



Radula complanata, 154. 

 (Figs. 101, 102.) 



Rafflesiaceae, classification, 

 12 ; embryo, 461. 



Ramenta (chaff-scales). See 

 Paleae. 



