CONTENTS 
SS0.5^ 
PAGE 
Miss Ethel Sargant, F.LS.. . . i . . i-v 
Edward Alexander Newell Arber . .vii-ix 
No. CXXV, January, 1918. 
Bower, F. O.—Studies in the Phylogeny of the Filicales. VII. The Pteroideae. With forty- 
three Figures in the Text ........... 1 
Blackman, V. H., and Paine, S. G.—Studies in the Permeability of the Pulvinus of Mimosa 
. pudica. With five Figures in the Text.69 
Arber, Agnes. —Further Notes on Intrafascicular Cambium in Monocotyledons. With four 
Figures in the Text.. . . . S7 
Mottier, David M.—Chondriosomes and the Primordia of Chloroplasts and Leucoplasts. 
With Plate I. 9 1 
Murphy, Paul A.—The Morphology and Cytology of the Sexual Organs of Phytophthora 
erythroseptica, Pethyb. With Plates II and III. 115 
Weston, William H. — The Development of Thraustotheca, a Peculiar Water-Mould. With 
Plates IV and V and two Figures in the Text. 155 
NOTE. 
Paine, S. G., and Saunders, L. M.—On a Peculiarity exhibited by the Testa of Wrinkled Peas 175 
No. CXXVI, April, 1918. 
Parr, Rosalie. —The Response of Pilobolus to Light. With four Figures in the Text. .177 
Rivett, M. F.—The Structure of the Cytoplasm in the Cells of Alicularia scalaris, Cord. 
With Plate VI and three Figures in the Text ........ 207 
Sargent, Oswald H. —Fragments of the Flower Biology of Westralian Plants . . .215 
Davie, R. C.—A Comparative List of Fern Pinna-traces, with some Notes on the Leaf-trace 
in the Ferns. With five Figures in the Text.. . . 233 
Sharples, A.—The Laticiferous System of Hevea brasiliensis and its Protective Function . 247 
Gates, R. Ruggles. —A Systematic Analytical Study of certain North American Con- 
vallariaceae, considered in regard to their Origin through Discontinuous Variation . 253 
Brenchley, Winifred E.—Organic Plant Poisons. II. Phenols. With eighteen Figures 
in the Text.259 
Ishikawa, Rigakushi , M.—Studies on the Embryo Sac and Fertilization in Oenothera. 
With Plate VII and fourteen Figures in the Text . ..279 
No. CXXVII, July, 1918. 
Campbell, D. H.—Studies on some East Indian Hepaticae. With Plates VIII and IX and 
ten Figures in the Text ....319 
Willis, J. C.—The Sources and Distribution of the New Zealand Flora, with a Reply to 
Criticism. With seven Figures and Map in the Text.339 
S^hni, Birbal. —On the Branching of the Zygopteridean Leaf, and its Relation to the probable 
1 Pinna ’ Nature of Gyropteris sinuosa, Goeppert. With three Figures in the Text . 369 
Collins, E. J.—The Structure of the Integumentary System of the Barley Grain in Relation 
to Localized Water Absorption and Semi-permeability. With four Graphs, nine 
Figures, and one Key Figure in the Text.381 
Graham, Margaret. —Centrosomes in Fertilization Stages of Preissia quadrata (Scop.), 
Nees. With Plate X . . . . ..415 
