PLATE 5 



Xen-ocoocus Gilkeyae 8. and G. 



Fig. 11. Group of vegetative cells and gonidangia in various stages of devel- 

 opment. X 500. 



Xenococcus pyriformis S. and G. 



Fig. 12. Groups of vegetative cells as viewed from different angles, and three 

 gonidangia. X 500. 



Xenococcus acervatus S. and G. 



Fig. 13. Vegetative cells, some showing cell divisions, others showing a heaped- 

 up condition as seen in median plane view of the host. X 500. 



Dermocarpa sphaerica S. and G. 



Fig. 14. Vegetative cells and gonidangia, a-h, with the wall still in position, 

 and c-d, showing where the walls have dissolved in position. X 500. 



Pleurorapsa gloeocapsoides S. and G. 



Figs. 15, 16. Groups of vegetative cells in various stages of development. 

 X 500. 



Fig. 17. Showing formation of gonidia. X 500. 



Arthrospira breviarticulata S. and G. 



Fig. 18. An individual showing the loose spiral doubled and entwined upon 

 itself. 



This plate is a reprint of Gardner, Univ. Calif. Publ. Bot., vol. 6, pi. 39, p. 482, 

 1918. 



[132] 



