Postelsia 
to 
No 
of lamine; the darkest portions are places 
where sori on both sides overlap. Reduced 
to about one-fourth natural size. Figures 1-11 
Renjrewia parvula. Figures 12-13. 
Renjrewia parvula perlonga. 
Figure rt. 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 scenhE 
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. 
