272 p s t e I s i a 



of laminae; the darkest portions are places 

 where sori on both sides overlap. Reduced 

 to about one-fourth natural size. Figures i-ii 

 Renjrewia parviila. Figures 12-13. 



Renjrewia parvula perlonga. 



Figure i. A short-stiped form with a small 

 sorus. 



Figure 2. A plant with a lamina 12.5x2 

 centimeters with sorus already developed. 



Figure 3. A plant with a stipe 20 centi- 

 meters long, sorus showing a decided tendency 

 to split into longitudinal stripes. 



Figure 4. A small plant with sorus divided 

 into three longitudinal stripes. 



Figure 5. The type specimen with large 

 well developed sorus. 



Figure 6. Specimen with the sorus divided 

 into two by a band of sterile tissue. 



Figures 7 and 8. Two juvenile forms mea- 

 suring about 5 centimeters each, though figure 

 8 represents an abraded plant older than figure 7. 



Figure 9. Small plant with the sorus par- 

 tially divided transversely. 



