^^DESCRIPTION OF PLA.TES X & ILL— continued. 



8. — Transverse section of the prothallus in fig. 4 at the point ar; this is 

 figured in the plate with the under side of the prothallus uppermost. 



9. — Longitudinal section of prothallus in fig. 2 in the direction of the 



10. — Longitudinal section of a prothallus p p, similar to fig. 4, made 

 through the place of origin by budding of a young plant ; the other 

 letters as in figs. 1 — 3. 



11. — More magnified view of a portion of the prothallus in fig. 5. 



