174 BOTANICAL GAZETTE. [ July, 
sporangium is shaped like the finger of a glove. The dehis- 
cence extends the whole length of the sporangium, and is 
always along the surface which is directed toward the stalk 
of the scale. ee 
Examined with the microscope, the sporangium- wall 1s 
seen to be composed of several layers of cells. The atten- 
