CONTENTS. 
PAGE 
No. CXXXIII, January, 1920. 
Campbell, D. H. — Studies in some East Indian Hepaticae. Calobryum Blumei, N. ab E. 
With Plate I and six Figures in the Text 1 
Bergman, H. F. — The Relation of Aeration to the Growth and Activity of Roots and its 
Influence on the Ecesis of Plants in Swamps. With three Graphs in the Text . . 13 
Bristol, B. Muriel. — On the Alga-Flora of some Desiccated English Soils : an Important 
Factor in Soil Biology. With Plate II and twelve Figures and three Tables in the 
Text .35 
Bexon, Dorothy. — Observations on the Anatomy of Teratological Seedlings. II. On the 
Anatomy of some Polycotylous Seedlings of Centranthus ruber. With nine Figures 
in the Text 81 
Ghose, S. L. — A New Species of Uronema from India. With fifteen Figures in the Text . 95 
Spratt, Amy Vera. — Some Anomalies in Monocotyledonous Roots. With Plate III and 
one Figure in the Text 99 
Salisbury, E. J.— Variation in Anemone apennina, L., and Clematis vitalba, L., with Special 
Reference to Trimery and Abortion. With nine Figures and two Tables in the Text 107 
Sahni, B. — On Certain Archaic Features in the Seed of Taxus baccata, with Remarks on the 
Antiquity of the Taxineae. With seven Figures in the Text . . . . .117 
NOTES. 
Benson, M. — Cantheliophorus, Bassler : New Records of Sigillariostrobus (Mazocarpon) . 135 
Bristol, B. Muriel. — On the Gemmae of Tortula mutica, Lindb. With five Figures in the 
Text 137 
Notice of Book T40 
No. CXXXIV, April, 1920. 
Wormald, H.— The ‘Brown Rot’ Diseases of Fruit Trees, with Special Reference to two 
Biologic Forms of Monilia cinerea, Bon. II. With Plates IV and V . . . 143 
Bailey, M. A. — Puccinia malvacearum and the Mycoplasm Theory. With two Figures in 
the Text 173 
Barratt, Kate. — A Contribution to our Knowledge of the Vascular System of the Genus 
Equisetum. With Plates VI and VII and twenty-four Figures in the Text . .201 
Browne, Isabel M. P. — A Third Contribution to our Knowledge of the Anatomy of the Cone 
and Fertile Stem of Equisetum. With Plates VIII and IX and seven Figures in the 
Text 237 
Carter, Nellie. — Studies on the Chloroplasts of Desmids. III. With Plates X-XIII and 
two Figures in the Text ............ 265 
Bews, J. W. — Plant Succession and Plant Distribution in South Africa 287 
No. CXXXV, July, 1920. 
Blackman, V. H. — Radio-activity and Normal Physiological Function .... 299 
Carter, Nellie. — Studies on the Chloroplasts of Desmids. IV. With Plates XIV-XVI . 303 
Holden, H. S. — Observations on the Anatomy of Teratological Seedlings. III. On the 
Anatomy of some Atypical Seedlings of Impatiens Roylei, Walp. With one hundred 
and thirteen Figures in the Text . . 321 
Bottomley, W. B. — The Growth of Lemna Plants in Mineral Solutions and in their Natural 
Medium .... 345 
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