5o6 



INDEX. 



153) i57j 158; sexual or- 

 gans, 157. 



Nucellus, 300, 304, 382. 



Nucules (Characeaej, 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, 133. 



Oedogonieae, 44. 



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

 46 ; oospores, 7, Fig. 2 ; 

 structure and develop- 

 ment, 44, 45. (Figs. 20, 



Oedogonium ciliatuni, Hg. 

 22. 



Oedogonium diplandrum, 

 androspores, 45 ; sperma- 

 tozoids, 46. 



Oedopodmm, proLonema, 

 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. 



(t'ig. 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, 2 50 ; 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.) 



Ophr y deae, embryo-sac, 441; 

 floral diagram, 4 1 5; pollen- 

 grains, 369. 



Opuntia, funicle, 381 ; peri- 

 anth, 350 ; placentation, 

 378. 



Orchideae, adventitious 



shoots, 434; embryo, 431 ; 

 embryo-sac, 389, 441,445; 

 fertilisation, 347, 390, 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. 



Orthotricum Lyellii, pro- 

 tonema, 172. 



Orthotricum obtusifolium, 

 protonema, 172. 



Orthotricum phyllanthum, 

 protonema, 172. 



Orthotropous (ovule), 382. 



Oscillatoria, blue-green col- 

 ouring matter, 21. 



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. 



