The Ohio ^naturalist, 
PUBLISHED BY 
The Biological Club of the Ohio State University. 
Volume XIII. NOVEMBER, 1912. No. 1. 
TABLE OF CONTENTS. 
McAvoy— The Reduction Division in Fuchsia. 1 
Schaffner— Au Undescribed Equisetum from Kansas. 19 
Overholts— Concerning Ohio Polyporacese. 22 
Schaffner— Meeting of the Biological Club. 24 
THE REDUCTION DIVISION IN FUCHSIA*. 
Blanche McAvoy. 
The genus Oenothera has been of great interest in recent years 
to biologists because of DeVries’ studies on Oenothera lamarck- 
iana in connection with his development of the mutation theory. 
A number of investigators have worked on Oenothera among 
whom may be mentioned Lutz (13 & 14), Geertz (10), Gates 
(5, 6, 7, 8 & 9), and Davis (2 & 3). 
Some of the investigators have worked on the cytology of the 
micro- and mega-sporocytes while others have worked on the 
genus from a somewhat different point of veiw, getting the com¬ 
plete life history as a basis for evidence of the validity of DeVries’ 
results. 
Geertz (10) has made a complete study of Oenothera la- 
marckiana beginning with the arehesporial cell, taking up the 
cytology and continuing on through the details of the complete 
life history. In some of the microsporocytes he describes threads 
with small chromatin discs on them, some of the threads being 
quite small and others thicker. He calls the early contraction 
generally observed in prepared sporocytes synapsis and says that 
in some cases there were loops extending out from the contracted 
mass. The material may be contracted around the nucleolus or 
may be separated from it. Immediately after synizesis he 
represents fully formed chromosomes in the nuclear cavity. He 
says that the 2x number of chromosomes were formed and later 
Contribution from the Botanical Laboratory of Ohio State Uni¬ 
versity, No. 69. 
