464 BOTAXICAL GAZETTE [juxe 



sporogenous nucleus; spm.m.c. spermatium mother cell; st.c. stalk cell: 

 tr., trichogyne. 



PLATE XIX 



Fig. 8. — Vertical section through holdfast showing horizontal hypha and 

 vertical ascending, dichotomously branched hyphae: X355. 



Fig. 0. — Slightly diagrammatic: vertical section through base of plant 

 and holdfast ; X 1 7 1>. 



Fig. 10. — ^Longitudinal section through wall of thallus showing radial 

 hyphae arising as branches of longitudinal, medullar}.* hyphae: X700. 



Fig. 11. — Longitudinal section through apex of young branch: X540. 



Fig. 12. — Surface view of subcortical cell showing structure of chroma to- 

 phore: Xiooo. 



Fig. 13. — Longitudinal section through an intercellular connection show- 

 ing granules of which disk is composed; X700. 



Fig. 14. — Longitudinal section through an intercellular connection, between 

 2 carpospores, in which granules have not yet become grouped together to form 

 disks: Xiooo. 



Fig. 15. — Transverse section through wall of thallus of male plant showing 

 stalk cells, spermatium mother cells, and spermatia: Xiooo. 



Fig. 16. — Longitudinal section through binucleate spermatium mother 

 cell: X1400. 



F::-. 17. — Similar section; spermatium mother cell which has budded off 

 one spermatium; X1400. 



Fig. iS. — Transverse section through wall of male plant showing free 

 spermatia imbedded in gelatinous sheath of thallus: Xiooo. 



Fig. 19. — Longitudinal section through spermatium mother cell and sper- 

 matium: chroma tophore at base of spermatium mother cell: X1400. 



Fig. iz. — Longitudinal section through wall of thallus showing origin of 

 carpogonial branches ; X353. 



Figs. :i. 22. — Longitudinal section of first cell of carpogonial branch, 

 showing mode of origin from subcortical cell; chroma tophore is similar to 

 those of vegetative cells; Xiooo. 



F::-. :' : . — Longitudinal section of a 2-celled carpogonial branch: Xiooo. 



Fig. 24. — Similar section of a 3-celled carpogonial branch; Xiooo. 



Fig. 25. — Longitudinal section of a 3-celled carpogonial branch; Xiooo. 



Fig. 26. — Similar section of a 4-celled carpogonial branch showing that 

 number of cells is increased bj T division of terminal cell; Xiooo. 



F:: 27. — Similar section of a 4-celled carpogonial branch showing that 

 branches at this stage may be bent to form a right angle; Xiooo. 



Fig. 2S. — Four-celled carpogonial branch; nucleus in terminal cell contains 

 7 chromosomes (?); Xiooo. 



F::-. ::. — Five-celled carpogonial branch showing position and structure 

 of chromatophores; Xiooo. 



