24 
Annals of Botany . 
Ophioglossaceous spike, morphology, 25 , 
291. 
Ophioglossum granulatum, nature of the 
Cretaceous plant (*), 25 , 903. 
— palmatum, anatomy of stock and leaf- 
trace (*), 25 , 278 ; morphology of fertile 
spikes (*), 25 , 282; morphology of the 
Ophioglossaceous spike, 25 , 291. 
— simplex, morphology, 22, 327. 
Opuntia, j pp., seedling-structure (*), 24 , 
129. 
Orchis purpurea, abnormal flowers (*), 29 , 
155. 
Orthoheliotropic organs (*), 23 , 470. 
Osborne, T. G. B. : A Preliminary Note on 
the Life-history and Cytology of Spongo- 
spora subterranea, Wallroth, 25 , 271. 
— Spongospora subterranea, (Wallroth) 
Johnson (*), 25 , 327. 
— The Lateral Roots of Amyelon radicans, 
Will., and their Mycorhiza (*), 23 , 603. 
Osmundaceae, anatomy (*), 25 , 525 ; 30 , 
487; foliar gaps (*), 24 , 107 ; leaf-structure 
(*), 30 , 487 ; leaf-trace structure (*), 25 , 
529; sporeling-structure (*), 25 , 528. 
-—- Jurassic from New Zealand (*), 28 , 471. 
— regalis, ‘ mixed pith ’ in an anomalous 
stem (*), 28 , 35 t. 
Ostenfeldiella, n. gen., description, 28 , 648. 
— Diplantherae, n. sp., biology (*), 28 , 646 ; 
diagnosis, 28 , 648. 
Otidea aurantia, cytology (*), 22 , 465. 
Overton, J. B. : On the Organization of the 
Nuclei in the Pollen Mother-cells of Cer- 
tain Plants, with Especial Reference to 
the Permanence of the Chromosomes (*), 
23 , 19. 
Ovule, of Angiosperms, consideration of, 23 , 
633 ; of Bowenia spectabilis, structure and 
development (*), 26 , 625 ; of Myrica 
Gale, structure and development (*), 23 , 
353 - 
Oxalate, presence of in ‘ infection drop 5 , 30 , 
4 ° 5 - 
Oxalis acetosella, insect visitors, 22 , 617. 
Oxygen, relation of reproduction in Saccharo- 
myces to supply of free, 28 , 197. 
Ozazone method of locating sugars in plant 
tissues (*), 29 , 369. 
P. 
Pachyphloeus, description, 23 , 255. 
— citrinus, description, 23 , 255. 
— conglomerate, description, 23 , 255. 
— melanoxanthus, description (*), 23 , 255. 
Pachypodium namaquanum, anatomical rela- 
tionships, 26 , 939; leaf-structure (*), 26 , 
935 ; protuberances and species (*), 26 , 
93 3, 938 ; stem-structure (*), 26 , 931. 
Paeonia, spp., seedling-anatomy (*), 28 , 707 ; 
vascular anatomy (*), 22, 663. 
Paeoniaceae, vascular anatomy (*), 22 , 663. 
Paine, S. G. : On the Supposed Origin of 
Life in Solutions of Colloidal Silica (*), 
30,383. 
— see Blackman, V. H. 
Palaeobotanical reconstruction, methods of, 
(*), 27,273. 
Palaeostachya vera, anatomy (*),. 21 , 369 ; 
axis (*), 21, 372 ; bracts (*), 21, 377 ; 
cone affinities, 21, 381 ; cortex (*), 21, 372 ; 
general features (*), 21, 371 ; medulla (*), 
21, 373 ; sporangiophore (*), 21, 375, 
378 ; spores, 21, 379 ; vascular system 
(*), 21, 374 . 
Palaeozoic seeds, structure (*), 21 , 89. 
of the Conostoma type, structure and 
affinities (*), 25 , 
Palisade cells, cause of formation, 26 , 842 ; 
effect of environment on production (*), 
26 , 834. 
Palmellaceae, Coccomyxa subellipsoidea, a 
new member of (*), 23 , 573. 
Palms, aquatic origin, 25 , 723; branching 
in (*), 21 , 416 ; 23 , 338. 
Panama disease (*), 24 , 488 ; 25 , 243, 353 ; 
enzymes, 25 , 357 ; haustoria (*), 25 , 356 ; 
hvphae, 25 , 358 ; mycocecidia (*), 25 , 
357 ; pegmatia (*), 25 , 353 ; pycnidia (*), 
25 , 356; spores (*), 25 , 355. 
Pandanus, antipodal cells (*), 25 , 781 ; 
embryo (*), 25 , 784 ; embryo-sac (*), 25 , 
776 ; fertilization (*), 25 , 782 ; ovule (*), 
25 , 775 ; pollen (*), 25 , 776. 
— spp., embryo-sac, 22 , 330; (*), 25 , 776, 
779 - 
Papain, 23 , 1. 
Papaver, spp., seedling-anatomy, 28 , 719. 
Papayotin, 23 , 1. 
Paracupressinoxylon cedroides, anatomy of 
wood (*), 27 , 537- 
— cupressoides, anatomy of wood (*), 27 , 
538 . 
Paradenocline, review of, 27 , 388. 
Paraphyllocladoxylon araucaroides, anatomy 
of wood (*), 27 , 536. 
— eboracense, anatomy of wood (*), 27 , 536. 
Parasite and host, relationship (*), 25 , 653, 
661. 
Parasitism in Exocarpus, root (*), 24 , 667. 
— physiology of, 29 , 313 ; (*), 30 , 389, 399. 
Parasynapsis and telosynapsis, 26 , 623. 
Parkin, J. : see Arber, E. A. N. 
Parnassia, affinities, 27 , 500 ; anatomy of 
stamens of Indian species (*), 29 , 159; 
structure of androecium (*), 27 , 491. 
— palustris, insect visitors, 22, 626. 
Pearson, H. H. W. : On the Embryo of 
Wehvitschia (*), 24 , 759. 
— On the Microsporangium and Microspore 
of Gnetum, with some Notes on the 
Structure of the Inflorescence (*), 26 , 
603. 
Pectic substances, microchemical reactions, 
25 , 747. 
