368 Phillips.-— Cystocarp in Rhodymeniales. 
EXPLANATION OF FIGURES IN PLATES 
XVII AND XVIIL 
Illustrating Prof. Phillips' paper on the Cystocarp in Rhodymeniales. 
Abbreviations : aux. c., auxiliary cell ; gon. hi ., gonimoblast-filaments ; st. hr., 
sterile branch; ps. tr., pseudo-trichophores ; tr., trichogyne. 
The material was usually fixed in formaldehyde, and after staining in Hoffmann’s 
blue, mounted in strong glycerine. The cells shaded are those of the carpogonial 
branch; the red cells are sterile derivatives of the mother-cell of the carpogonial 
branch. The more heavily defined cells are those of the gonimoblast-filaments. 
PLATE XVII. 
Figs, i, 2, 3. Median views of three stages in the development of the cystocarp 
in Bonnemaisonia asparagoides . 
Figs. 4, 5, 6, y. Median views of four stages in the development of the cystocarp 
in Plocamium coccineum. 0 
Figs. 8, 9, 10. Median views of three stages in the development of the cystocarp 
in Calleblepharis ciliala. 
PLATE XVIIL 
Fig. 11. Apical portion of a branch of Antithanmion Plumula, showing two 
procarps. 
Fig. 12. Later stage, showing conjugation of the carpogonium with the 
auxiliary cell. 
Fig. 13. Fertile branch of Griffithsia corallina , showing condition immediately 
subsequent to fertilization. 
Fig. 14. Stage showing conjugation of carpogonium with auxiliary cell, and 
fusion of cells of the carpogonial branch. 
Fig. 15. Later stage, showing remains of conjugation-tube in swollen cell -wall ; 
the gonimoblast-filaments have begun to develop. 
Fig. 16. Median section of end of procarp-bearing branch in Ptilota plumosa . 
Fig. iy. Median section of end of procarp-bearing branch in Plumaria elegans. 
The pseudo-trichophore on the right is budding off vegetative cells. One of the 
branches of the involucre has become a pseudo-trichophore. 
Fig. 18. Later stage, showing contiguity of carpogonium and auxiliary cell in 
Ptilota plumosa . 
Fig. 19. Shows the two carpogonial branches in Ceramium tenuissimum. In 
one case conjugation of carpogonium and auxiliary cell is taking place. 
Fig. 20. Young procarp of Cal lit ham n ion g> an ulatu m . 
Fig. 21. Later stage of Callithamnion byssoides. The carpogonium has grown 
out into two gonimoblast-cells right and left, which are closely opposed to the 
auxiliary cells. 
