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80 FERNS OF KENTUCKY. 
indusia after all. Then, in many Aspidiums the indusium 
is so small and delicate that it is hard to find even on 
living plants. On the whole, there is an unmistakable 
passage from Phegopteris into Aspidium. Some German 
writers even insist that the two are but one natural genus.” 
Figure 1 represents a pinnule slightly magnified; figure 
2, a lobe greatly magnified, showing the situation of the 
sporangia and the structure of the tissue. 
