205 



6. Transverse sections of stem X 22, showing ventral callosity from which the 

 root-hairs arise. 



7. Antheridium. X 4°- 



8. Median sagittal section of perigynium and adjacent portions of stem, showing < 

 embryo sporogonium with capsule, seta, foot, and " involucellum," also unfertilized 

 archegonia, perianth, insertion of involucral leaves, root-hair callosity, etc. X 23 

 (slightly schematized). The free part of the perianth as drawn here and in the next 



is proportionally rather too short and not sufficiently inflated below. ' 



9. Sagittal section of mature perigynium from which the seta has been detached, \ 

 showing fully developed calyptra and the unfertilized archegonia raised upon the base 



of its free portion, X 20 (slightly schematized). 



10. Surface view of embryo capsule, exhibiting the spiral lines, which presumably 

 bound the valves. X S^- 



11. Valves of capsules, showing position taken by them when moistened. X ^2. | 



12. Apex of a single valve. X ^2. ' 



13. Base of dehisced capsule from above, showing spiro-radial insertion of valves. 



X36. j 



14. Cells of inner surface of capsule valve. X 'SO- ' I 



15. Elater and spores. X I37- 



Columbia University, Department of Botany, 



April 9, 1897. I 



