122 Puget Sound Marine Sta. Pub. Vol. 1, No. 12 



12. Walls_, plugs and mucrons are not cellulose, and may contain 

 pectin. 



13. Utricles at the base of the frond are more slender and with 

 longer mucrons than those of the U2jper part. 



14. The facts that basal utricles are not only of different size and 

 shape, with longer mucrons than those above, and often have oddly thick- 

 ened and distorted end walls ; and that they were not found with 

 gametangia ; suggests that they are ^physiologically different from the re- 

 producing utricles of the upper part of the frond. 



15. The splitting of C. mucronatum into two varieties, Calif ornicum 

 and Novae Zelandiae distinguished by differences in the mucronate tips 

 of the utricles is not justified, for all the described types may often be 

 found on the same plant, variations being due to the age of the utricle, its 

 location on the plant and the amount of weathering it has undergone. 



I wish to express my appreciation of the assistance of Prof. Josephine 

 E. Tilden under whose direction this investigation was carried on; and 

 my gratitude to Dr. T. C. Frye, Director of the Puget Sound Marine 

 Station, for many helpful suggestions. 



CITATIONS 



1. Agardh, J. G. Till Algernes Systematik. VIII. Siphoneae. 43, 44. 1886. 



2. Berthold, G. Zur Kenntnis der Siphoneen und Bangiaceen. Mitteilungen 

 a. d. zoolog. Station z. NeapeL 2:72-82. 1881. 



3. Berthold, G. Uber die Verteilung der Algen im Golfe von Neapel. 



Mitteilungen a. d. zoolog. Station z. Neapel. 3:393-536. 1882. 



4. Collins, F. S. The Green Algae of North America. Tufts College 

 Studies. 2:386-389. 1905-1909. 



5. Dixon, H. H. Structure of Codium. Ann. Bot. 11:588-590. 1897. 



6. Ernst, A. Siphoneen-Studien 1. Beih. Bot. Centralb. 13:115-148. 1902. 



7. Ernst, A. Siphoneen-Studien 2. Beih. Bot. Centralb. 16:199-233. 1904. 



8. Falkenberg, P. Die Meeresalgen des Golfes von Neapel. Mitteilungen 

 a. d. zoolog. Station z. Neapel. 1:217-277. 1879. 



9. Harvey, W. H. Nereis Boreali-Americani. 3:29. 1857. 



10. Hauck, F. Die Meeresalgen Deutschlands und Osterreichs. Raben- 

 horst's Kryptogamenflora. 2:477-479. 1885. 



11. Kiister, E. Zur Anatomie und Biologie der Adriatischen Codiaceen. 

 Flora 85:170-188. 1898. 



12. Kiister, E. Pathological Plant Anatomy, p. 28. 1903. 



