I 
,\tr 
Vol. XXXI. No. CXXII. April, 1917. Price 14s. 
Annals of Botany 
EDITED BY 
DUKINFIELD HENRY SCOTT, M.A., LLvD, D.Sc., F.'r.S. 
LATELY HONORARY KEEPER OE THE JO OR ELL LABORATORY, ROYAL BOTANIC GARDENS, KF.W 
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 BOTANY IN HARVARD UNIVERSITY, CAMBRIDGE, MASS., U.S.A. 
ASSISTED BY OTHER BOTANISTS 
HUMPHREY MILFORD, OXFORD UNIVERSITY PRESS 
AMEN CORNER, E.C. 
Edinburgh, Glasgow, New York, Toronto, 
Melbourne, Cape Town, and Bombay 
1917 
Printed in England at the Oxford University Press 
