Postelsia 27 
ios) 
Figure ro. Specimen with orbicular sorus 
at base of lamina. 
Figure 11. Large plant measuring 23x6 
centimeters which has not yet begun to develep 
a SOruUs. 
Figure 12. Plant with five longitudinal 
stripes of fertile tissue. 
Figure 13. A very long narrow plant 3 
x 118 centimeters. 
Plate XVII. Photomicrographs of the stipe. 
t. Radial view of portion of cross section 
showing the tissues from the pith outward. B. 
Serize “Obie 4, (OC: Tf. 
2. Portion of above showing in detail the 
pithweb and the innermost portion of the 
COmex eb. We ap). 0C. 2. 
Plate X VILL 
t. Longitudinal section of the stipe showing 
the pith-web with elongated cells of the inner 
layerseor thescortex, “Biel. obi, 4, 0cs 2. 
2. Radial section of a holdfast showing an 
appressed secondary branch. Leitz obj. 1, B. 
SoELEAROC. 2: 
