Vol. XXXII. No. CXXVI. April, 1918. Price 14s. 
Annals of Botany 
EDITED BY 
DUKINFIELD HENRY SCOTT, M.A., LL.D , D.Sc., F.R.S. 
LATELY HONORARY KEEPER OF THE JODRELL LABORATORY, ROYAL BOTANIC GARDENS, KEW 
JOHN BRETLAND FARMER, D.Sc., M.A., F.R.S. 
PROFESSOR OF BOTANY, ROYAL-COLLEGE OF SCIENCE, LONDON 
FRANCIS WALL OLIVER, M.A,, D.Sc., F.R.S. 
QUAIN PROFESSOR OF BOTANY, UNIVERSITY COLLEGE, LONDON 
ROLAND THAXTER, M.A., Ph.D. 
PROFESSOR OF CRYPTOGAMIC ROTANY IN HARVARD UNIVERSITY, CAMBRIDGE, MASS., U.S.A. 
ASSISTED BY OTHER BOTANISTS 
LONDON 
HUMPHREY MILFORD, OXFORD UNIVERSITY PRESS 
AMEN CORNER, E.C, 
Edinburgh, Glasgow, New York, Toronto, 
Melbourne, Cape Town, and Bombay 
1918 
Printed in England at the Oxford University Press 
