The Ohio T^aturalist, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni'versity, 



Volume XIII. NOVEMBER, 1912. No. 1. 



TABLE OF CONTENTS. 



Mc AvoY — The Reductiou Division in Fuchsia 1 



ScHAFFNER— An Undescrlbecl Equisetum from Kansas 19 



OvEEHOLTS— Concerning Ohio Polyporacea' 22 



ScHAFFNEE— ^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 archesporial 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. 



LxjLIBRARYJ^ 



