254 p s t e I s ia 



a region lo centimeters long which is sterile 

 except for a few small dots of fertile tissue, 

 and distal to this there is the second sorus 

 which is more irregular in outline and measures 

 IOX2 centimeters. One might suppose from 

 this specimen that we have here a regular 

 succession of sori of different ages from the 

 base to the tip, which renders fruiting contin- 

 uous. lUit I tlu'nk tliat such is not the case 

 in Rciijrcwia for this is a single specimen 

 among more than a Inindred examined, and 

 tlie few small dots of fructiferous tissue be- 

 tween the two sori seem to indicate that instead 

 of two distinct sori, we have only an unusual 

 case of irregularity. Moreover, as nearly as 

 can be determined without sectioning, for the 

 specimen seems too valuable to mutilate, both 

 of the ])atches arc of the same age. 



Because of the low level at which it grows, 

 juvenile forms are diflficult to obtain and the search 

 made for them was rather meagerlv rewarded. 

 A complete series was not found, the smallest 

 being 5 centimeters long with others larger 

 connecting with the mature forms. Since the 



