288 K. YENDO. 



6. Cross section of a young antheridium. X 150. 



7. Cross section of a mature antheridium. X 150. 



8. Longitudinal section of a stichidial wart. The stichidia somewhat 

 schematized. X 37. 



9. Stichidia. X 150. 



10. Cross section of a stichidium. X 150. 



11. Longitudinal section of a cystocarp. X 150. 



12. Cross section of a frond of Chondria crassicaulis, infested by a male 

 parasite; the cells belonging to the parasite are shaded. X 150. 



Printed Septembre 30th 1913. 



