HALLE, FRUCTIFICATIONS OF CLADOPHLEBIS DENTICULATA. 9 
so great that SEWARD and others have advocated a specific iden- 
tity. It is surprising therefore that, in the latter species, the 
sporangial structure is so different that it can have led RENAULT 
to refer the species to a recent genus of the Osmundacee. A 
new and more detailed examination of RENAULT’s species ap- 
pears highly desirable. "That it cannot be specifically identical 
with our plant is probable already from the fact that the spo- 
rangia are much smaller as compared with the size of the 
pinnules. According to RENAULT’s figures they occupy only a 
narrow zone on each side of the vein, whereas in our species the 
two rows of sporangia completely fill up the area between two 
adjacent veins and even touch in the middle of it. 
Addendum. 
After the foregoing was printed, Mr. HamsHaw THOMAS 
of Cambridge has kindly communicated to me some of the 
results of his examination of the fertile fronds of T'odites 
 Williamsoni. The sporangia were found to differ consider- 
ably from those of T'odea and of the Osmundacee generally, 
resembling in structure those described in the present paper. 
Todites Williamsoni appears from Mr. Tuomas’ results to be 
the species most closely related to Cladotheca undans and it 
might even be suggested that the latter should be included 
in the genus Todites. The difference in the distribution of 
the sporangia may, however, constitute a sufficient ground for 
a generic separation. 
Arkiv für botanik. Band 10. N:o 15. i? 
