INDEX. 



649 



530 ; periderm, 554; resin 

 passages, 452. 



Pistacia vera, resin passages, 

 452. 



Pistia, air-spaces, 210, 214, 

 219; crystals, 141, 220; 

 root-cap, 413; root de- 

 velopment, 397. . 



Pistia Stratiotes, calyptro- 

 gen layer, 9 (Fig, 2), 165. 



Pistia texensis, 210, 



Pisum sativum, apex of root, 

 12 (Fig. 5); vascular sys- 

 tem, 354. 



Pith, 236, 403. 



Pithecoctenium, 574. 



Pittosporese, secretory re- 

 servoirs, 202 ; vascular 

 system, 387. 



Pittosporum, bast-fibres, 

 526; resin passages, 204, 

 451. 



Pittosporum Tobira, 33,204, 

 479 : secretory passages, 

 526. 



Pittosporum undulatum, 33, 

 526, 



Plagiogyria biserrata, vascu- 

 lar system, 286. 



Planera, 305: cork, 551. 



Plantaginoae, 458. 



Plantago, sclerenchyma, 

 420 ; sieve-tubes, 231 ; 

 vascular system, 236. 



Platanus, bast-fibres, 527; 

 crystals, 140, 530; fibres, 

 134; hairs, 62; ligneous 

 bundle, 496 ; periderm, 

 548, 556; sclerosis, 540; 

 thyioses, 171 ; vascular 

 system, 242, 296. 



Platanus acerifolia, medul- 

 lary rays, 489. 



Platanus occidentalis, 242, 

 485: cork, III; pith, 40 3 ; 

 water-pore, 52. 



Platanus orientalis, crystals, 

 140. 



Platycerium, sclerenchyma, 

 426 ; vascular system, 

 ^05. 



Platycerium alcicorne, 15; 

 vascular system, 288, 344, 

 428. 



Platycodon grandiflorus, 

 laticiferous tubes, 525. 



Plectranthus, hairs, 61, 62. 



Plectranthus amboinensis, 

 periderm, 548. 



Plectranthus fruticosus, 

 glands, 93, 94: hairs, 59 

 (Fig. 21). 



Plenotoma, anomalous 



wood, 570 (Fig. 2.25), 574. 



Pleroma macrantha, hair 



structure, 65. 

 Pleurothallideae, 116, 117: 



parenchyma, 411; pores, 



54- 



Pleurothallis, hairs, 54 ; leaf 

 structure, 411. 



PleurothaUis ruscifolia, 411. 



Plumbagineas, lime scales, 

 106 ; vascular system, 249. 



Plumbago, 249 : lime scales, 

 106. 



Plumiera, laticiferous tubes, 

 187, 439. 



Plumiera alba, 187. 



Poa bulbosa, stomata, 50, 



Poa compressa, stomata, 50. 



Poa nemoralis, stomata, 50. 



Podocarpus, 14, 118 : paren- 

 chyma, 408, 410; resin 

 canals, 442 ; vascular sys- 

 tem, 246, 356, 380. 



Podocarpus Meyeriana, 380, 

 381. 



PodocarpusThunbergii, 380. 



PodophyIlum,sclerenchyma, 

 420; vascular system, 248, 

 249. 



Podostemaceae, vascular sys- 

 tem, 370. 



Pogostemon, glands, 93 ; 

 hairs, 62. 



Pogostemon Patchouli, glan- 

 dular hairs, 95 (Fig. 38). 



Polybotrya cervina, vascu- 

 lar system, 295, 427. 



Polybotrya Meyeriana, scle- 

 renchyma, 427,428; vas- 

 cular system, 295, 314. 



Polygala Senega, anomalous 

 thickening, 570. 



Polygonum, secretion, 98 ; 

 stomata, 49. 



Polygonum aviculare, sto- 

 mata, 48. 



Polygonum Fagopyrum, 

 apex of root, 11 (Fig. 



4). 



Polypodiaceae, 118: apical 

 cell, 15-18; parenchyma, 

 413 ; sieve-tubes, 180; 

 tannin-sacs, 153; vascu- 

 lar system, 285, 342. 



Polypodium, 118: lime in- 

 crustations, 106 ; scleren- 

 chyma, 426, 427, 428; vas- 

 cular system, 288, 307, 



344. 345) 364- 

 Polypodium altescandens, 



288. 

 Polypodium areolatum, 106. 

 Polypodium aureum, 15,106, 



288. 

 Polypodium aurisetum, 288. 



Polypodium Brownianum, 



427. 

 Polypodium cayennense, 



288. 

 Polypodium conjugatum, 



284. 

 Polypodium crassifolium, 



106. 

 Polypodium fraxinifolium, 



vascular system, 287 (Fig. 



136), 344. 

 Polypodium irioides, 364, 



427. 

 Polypodium Lingua, 15, 344, 



411, 426, 427,428: hairs, 



59 (Fig. 21); stomata, 37, 



42, 43. 

 Polypodium meniscifolium, 



106. 

 Polypodium morbillosum, 



106. 

 Polypodium Phyllitidis. 428. 

 Polypodium Phymatodes, 



15, 342. 

 Polypodium piloselloides, 



288. 

 Polypodium punctulatum, 



15- 



Polypodium pustulatum, 

 426, 428. 



Polypodium repens, 106. 



Polypodium rupesti-e, 15. 



Polypodium solidum, 427. 



Polypodium sporadocarpum, 

 106, 288, 427. 



Polypodium squamulosum, 

 314. 



Polypodium subauricula- 

 tum, 106. 



Polypodium tenellum, 288. 



Polypodium, vulgare, 15, 

 288, 426: concentric bun- 

 dles, 343 (Fig. 160); 

 sieve-tubes, 182. 



Polypodium Wallichii, 284. 



Pomaceae, 497 : crystals, 

 142; periderm, 548; 

 phelloderm, 549. 



Pontederia, air-spaces, 213, 

 217, 218; crystals and 

 raphides, 220. 



Pontederia cordata, 220 : 

 vascular system, 265. 



Pontederia crassipes, 220: 

 air-spaces, 215. 



Pontederieae, 10. 



Populus, crystals, 142 ; 

 fibres, 528 ; ligneous bun- 

 dle, 495, 496 ; medullary 

 rays, 492 ; periderm, 548, 

 558 ; sieve-tubes, 176 ; 

 stomata, 46 ; tracheides, 

 and fibres, 483. 



Populus fastigiata, cork, 1 1 1. 



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