INDEX. 



J 53> !57j 158; sexual or- 

 gans, 157. 



Nucellus, 300, 304, 382. 



Nucules (Gharaceae), 52. 



Nuphar, anthers, 354 ; em- 

 bryo-sac, 393 ; endosperm, 

 461 ; fruit, 429. 



Nut, 428. 



Nyctagineae, 468 ; stem- 

 structure, 466. 



Nymphaea, embryo-sac, 393 ; 

 endosperm, 461 ; ovule, 

 385 ; perianth, 350 ; sta- 

 mens, 360. 



Nymphaeaceae, 469 ; acyclic 

 flowers, 412; foliar struc- 

 tures, 378; flower, 424; 

 perisperm, 394 ; spiral 

 flowers, 412, 454; seed, 

 446 ; stem, 465, 466. 



Obdiplostemony, 418. 



Ochnaceae, 469. 



Ochrolechia, spore-germina- 

 tion, 123. 



Octaviania, 138. 



Oedogonieae, 44. 



Oedogonium, 6, 7, 8, 44, 45, 

 46 ; oospores, 7, Fig. 2 ; 

 structure and develop- 

 ment, 44, 45. (Figs. 20, 

 21.) 



Oedogonium ciliatum, Fig. 



22. 



Oedogonium diplandrum, 

 androspores, 45 ; sperma- 

 tozoids, 46. 



Oedopodium, protonema, 

 164. 



Oenothera, pollen-tube, 390. 



Oenothereae, floral diagram, 



457- 



Oidium. See Erysiphe 

 Tuckeri. 



Olacineae, 470. 



Oleaceae, 471. (Fig. 389.) 



Oleander, filament, 354. 



Olfersia, sporangia, 217. 



Omphalaria, 124. 



Onagrarieae, 470 ; anther- 

 cells, 369, note 2 ; pollen- 

 tube, 367. 



Oncidium aricrochilum, self- 

 sterility, 405. 



Oncophorus glaucus, proto- 

 nema, 173. 



Ononis, inflorescence, 410. 



Onopordon, leaves, 453. 



Oogamous fertilisation, 27, 

 32, 42, 43, 84. 



Oogonium, 33, 34, 45, 47, 

 52, 59, 61, 69, 94. (Fig. 

 3-) 



Oophore, 140, 141, 189, 197, 



229. 



Oophyte, 140, 189, 197, 229. 

 Oosphere, 27, 42, 52, 95, 141, 



150, 386. 

 Oospore, 6, 7, 42, 47, 84. 



(Fig. 4.) 



Opegrapha filicinae, 125. 



Opegrapha varia, 125. 



Operculum, 144, 185. 



Ophioglosseae, 189, 192, 193, 

 197,245; antheridia, 190; 

 asexual generation, 246 ; 

 habit and mode of life, 

 250; histology, 250; sexual 

 generation, 245 ; sperma- 

 tocytes, sporangia, 249 ; 

 sporophyte, 195 ; vegeta- 

 tive propagation, 251. 



Ophioglossum, antheridia, 

 246; archegonia, 246; 

 leaves, 247; prothallium, 

 246 ; roots, 246, 247 ; 

 sporangia, 249, 385; spo- 

 rangiferous branch, 247 ; 

 spores, 249 ; stem, 246 ; 

 tissue-forms, 250 ; vegeta- 

 tive propagation, 281. 



Ophioglossum Bergianum, 

 248. 



Ophioglossum palmatum, 

 248. 



Ophioglossum pedunculo- 

 sum, 245,246, 251. 



Ophioglossum pendulum, 

 248. 



Ophioglossum vulgatum,slow 

 development, 230. (Figs. 

 202, 204.) 



Ophrydeae,embryo-sac,44i ; 

 floraldiagram,4i5 ; pollen- 

 grains, 369. 



Opuntia, funicle, 381; peri- 

 anth, 350 ; placentation, 

 378. 



Orchideae, adventitious 

 shoots, 434 ; embryo, 431 ; 

 embryo-sac, 389,441, 445 ; 

 fertilisation, 347, 3 90, 392 ; 

 floral formula, 419; inflo- 

 rescence, 411; flower, 

 424, 425, 439; funiculus, 

 304 ; gynostemium, 359, 

 440; lateral shoots, 433; 

 perianth, 440 ; placenta- 

 tion, 378 ; pollen-grains, 

 369 ; pollen-tubes, 390 ; 

 pollination, 307, 390, 393; 

 primary root, 431, note i ; 

 suspensor, 400 ; zygomor- 

 phism, 440. (Fig. 344.) 



Orchis, 410 ; inflorescence, 

 411; pollen-tube-nucleus, 

 390, note 3. 



Orchis maculata, Fig. 354. 



Orchis militaris, Fig. 316. 



Orchis pallens, Fig. 321. 



Orobanchaceae, 471 ; em- 

 bryo, 446 ; stem, 466. 



Orobanche, 12, 393, 461. 

 (Fig. 328.) 



Orontiaceae, floral diagram, 

 438. g 



Orthotricum Lyellii, pro- 

 tonema, 172. 



Orthotricum obtusifolium, 

 protonema, 172. 



Orthotricum phyllanthum, 

 protonema, 172. 



Orthotropous (ovule), 382. 



Oscillatoria, blue-green col- 

 ouring matter, 2 1 . 



Oscillatorieae, 23. 



Osmunda, 228 ; adventitious 

 shoots, 200 ; histology, 

 222; prothallium, 199; 

 sori, 217; spore, 199; 

 wall of antheridium, 200 

 note. 



Osmunda regalis, leaf-forms, 

 209. (Figs. 148, 174- 

 176.) 



Osmundaceae, 194, 228; pro- 

 thallium, 200 ; spores, 198, 

 218 ; vascular bundles, 

 224. 



Ouvirandra, venation, 438. 



Ovary, 306, 370. 



Ovule, 300, 304, 305. 



Oxalideae, 469 ; floral dia- 

 gram, 419; flower, 423. 



Oxalis, bulbs, 451 ; hetero- 

 styly, 405. 



Oxymitra, thallus, 158. 



Ozothallia vulgaris, 72. 



Paeonia, 428 ; fruit, 427. 



Paleae (Ferns), 209, 216. 



Paliurus, inflorescence, 411. 



Palmella, 41. 



Palmellaceae, 35, 41, 114, 

 115, 125. 



Palms, 444; branching, 433; 

 leaves, 436, 437; phyllo- 

 taxis, 435, primary root, 

 431 ; primary stem, 432 ; 

 vascular bundles, 442. 

 (Fig. 373.) 



Pandaneae, 444. 



Pandanus, phyllotaxis, 426 ; 

 vascular bundles, 443. 



Pandorina, 34, 35, 36, 39. 

 (Fig. i.) 



Pandorina Morum, 35; de- 

 velopment, 35 ; reproduc- 

 tion, 36. (Fig. 16.) 



Panicle, 407. 



