(63) 



EXPLANATION OF PLATE CLII. 



Fig. 1. — Chorda filum, natural size. 

 2. — Longitudinal section of frond. 

 3. — Transverse section of same. 

 4. — Portion of the frond unrolled. 

 6. — Spores. 

 6. — Antheridia. 



7. — Internal chambers. All magnified. 

 (Partly reduced from Phyc. Bnt.) 



