3 ° 
Annals of Botany. 
Pith, morphological status, xix. 514. 
Plagiogyria biserrata, structure (*),xvii. 698. 
Plagiopteron fragrans, affinities and anatomi- 
cal characters, xvi. 177. 
Plankton of some English rivers, xix. 163; 
of Thames, xvi. 576; xvii. 631. 
Plasmodium, physiological properties of a 
Myxomycete (*), xi. 179. 
Platyzoma, habit, xv. 734 ; structure (*), 
xv. 735- 
Pleiotaxy of gynaecium of Orange (*), xvi. 
154 - 
Pleuroascus, n. gen., description, xv. 330. 
— Nicholsoni, n. sp., description (*), xv. 330. 
Plocamium coccineum, cystocarp develop- 
ment (*), xi. 352. 
Plowman, A. B. — The Comparative Ana- 
tomy and Phylogeny of the Cyperaceae 
(Plates I and II and two text-figures) 
(+), xx. 1. 
Plumaria elegans, cystocarp development 
(*), xi. 361. 
Plumbaginaceae, insects and flowers, xvii. 
320. 
Plumiera acutifolia, exudation of latex from, 
xiv. 205. 
Podocarpeae, vascular system of female 
flower (*), xiii. 537. 
Podospora curwicolla , description (*), xv. 
337 * 
— Jimiseda war. appendical at a, description 
(*), xv. 340. 
— pleiospora , description (*),xv. 338. 
— setosa , description (*), xv. 336. 
Podostemaceae, dorsi-ventrality of, with re- 
ference to current views on evolution, xvi. 
593 - 
Pogonia ophioglossoides, mycorhiza, xiii. 27 ; 
root-structure, xiii. 27. 
Poilanthes tuberosa, raphides (*), xii. 150. 
Pollen-mother-cells of Larix, spindle-forma- 
tion ; felt, formation of (*), xvii. 292 ; pre- 
radial stages (*), xvii. 289; radial stages 
(*), xvii. 291 ; spindle (*), xvii. 295. 
— of Lilium canadense, nuclear division in 
(*), xix. 189 ; heterotypic division (*) 
xix. 190; homoeotypic division (*), xix. 
219. 
Pollen-tube, development of and division of 
the generative nucleus in Pinus(*), xv. 193. 
Pollination of Cuphea, xvii. 163; of Lilaea 
subulata, xii. 1 8 ; of Peperomia pellucida 
(*), xv. 107; of Pinus (*), xv. 199; of 
Roridula (*), xvii. 15 1. 
Pollinium and sperm cells in Asclepias Cor- 
nuti, development (*), xvi. 123. 
Polychaetia paniculata, description, xx. 358, 
360. 
Polycotyledony (*), xvi. 553 ; origin of in 
Gymnosperms, xx. 473. 
Polygonatum biflorum, mechanism of sto- 
mata (*), xvi. 343. 
— multiflorum, raphides, xii. 149. 
Polygonum amphibium, infranodal organs 
(*), xv. 144. 
— tinctorium, localization of indigo-pro- 
ducing substance, xix. 305. 
Polymorphism of green Algae, xi. 97 ; of 
Cutleria multifida (*), xii. 75. 
Polypodium aureum, periderm (*), xix. 383 ; 
petiole-structure (*), xix. 382 ; seedling- 
structure (*), xix. 378. 
- — carnosum, biological considerations, xvi. 
212 ; leaf-structure (*), xvi. 203 ; mor- 
phology (*), xvi. 188; rhizome-structure 
(*), xvi. 193 ; root-structure (*), xvi. 201 ; 
systematic position, xvi. 221. 
— Schneideri, structure (*), xi. 533. 
— sinuosum, biological considerations, xvi. 
212; leaf-structure (*), xvi. 21 1 ; mor- 
phology (*), xvi. 207 ; rhizome-structure 
(*), xvi. 209 ; root-structure, xvi. 2 1 1 ; 
systematic position, xvi. 221. 
Polyporus squamosus, enzymes of, xx. 49. 
Polytrichum, central cylinder (*), xv. 16; 
cortex (*), xv. 14; rhizome, histology 
(*), xv. 13 ; stem, histology of aerial leafy 
(*), xv. 24. 
Polystely in Primula (*), xi. 307. 
Pond, R. H. — The Incapacity of the Date 
Endosperm for Self-Digestion, xx. 61. 
Poronia leporina, description (*), xvi. 74. 
— punctata, anatomy (*), xiv. 251 ; biology 
(*), xiv. 245 ; life-history (*), xiv. 246. 
Portulaceae, seedling-structure, xx. 474. 
Position of maximum geotropic stimulation, 
xix. 569. 
Potassium chloride, effect of on carbon- 
assimilation in Ulva latissima, xv. 62. 
— nitrate, effect of on carbon-assimilation 
in marine Algae, xv. 670. 
— phosphate, effect of on carbon-assimila- 
tion in marine Algae, xv. 677. 
Potato disease, xii. 561. 
Potentilla palustris, infranodal organs (*), 
xv. 140. 
Potter, M. C. — On the Occurrence of 
Cellulose in the Xylem of Woody Stems 
(Plate VIII), xviii. 121. 
Prain, D. — A Review of the Genera Meco- 
nopsis and Cathcartia (Plates XXIV and 
XXV), xx. 323. 
Primofilices, ancient Ferns (+), xx. 218. 
Primula, apex, xi. 323; leaves of seedling, 
xi. 316; petiole-structure (*), xi. 31 1; 
polystely (*), xi. 307 ; seedling-structure 1 
(*), xi. 317 ; variations in flower of species 
(*), xvi. 317. 
— floribunda, variations in flowers, xvi. 321. 
— veris, variations in flowers, xvi. 318, 325. 
— vulgaris, variations in flowers (*), xvi. 319, 
325. 
Primulaceae, development of pistil, xvi. 
322. 
Proliferation of ‘flowers’ of Cephalotaxus, 
xv. 643 ; of Pinus cone (*), xvii. 779. 
