ee Vol; LI 
THE 
BOTANICAL GAZETTE 
May iIo1Ir 
Editor: JOHN M. COULTER 
CONTENTS 
The Mode of Chromosome Reduction Reginald Ruggles Gates 
Filices Wilsonianae H. Christ 
i Two Epiphytic Algae Julia W. Snow 
The Development of the Spores in Pleurage eyEneno 
. M. Lewis 
Notes on Ginkgo biloba Walter W. Tupper 
The Origin of his Chloroplasts in the Cotyledons of Helian- 
hus annuus Edwin C. Miller 
Briefer Articles 
Two Sprouting Conifers of the Southwest F, J. Phillips 
Cell Division in Lyngbya William H. Brown 
Current Literature 
The University of Chicago Press 
CHICAGO, ILLINOIS 
CAMBRIDGE PR sits PRESS, London and Edinburgh 
WILLIAM SON, Lendon 
TH. sige ttny Leipzig 
