Vol. 45 No. 3 
BULLETIN 
OF THE 
TORREY BOTANICAL CLUB 
MARCH, 1918 
Studies of some new cases of apogamy in ferns 
W. N. STEIL 
(WITH PLATES 4 AND 5) 
INTRODUCTION 
During the past six years, the writer has made an attempt to 
determine to what extent undernormal cultural conditions apogamy 
occurs in the homosporous leptosporangiate ferns and especially 
in the genera Pellaea, Pteris, and Aspidium. Since the nuclear 
history in only a few apogamous ferns has been investigated, it was 
believed that further studies in the cytology of such ferns would be 
desirable. Hence an investigation of this nature was undertaken 
in the species in which apogamy was discovered, and this part of 
the work has been considered more interesting and important than 
the discovery of new cases of apogamy. In some of the ferns 
studied the nuclear history is wholly or partly known, but the dis- 
cussion of this subject is reserved for another paper. At this time 
new cases of apogamy will be reported and briefly considered. 
METHODS AND MATERIALS 
On account of the great difficulty experienced in securing spores 
for cultural work, the investigation, so far as the discovery of new 
cases of apogamy is concerned, cannot be regarded as wholly suc- 
cessful. Some of the spores were collected in the field. A large 
number of plants were grown in the university greenhouse, and 
[The BULLETIN for February (45: 51-92. pl. 1-3) was issued March 7, 1918] 
93 
