244 BOTANICAL GAZETTE [march 



3. A distinct phylogenetic series is seen in advance from con- 

 tinuous patches of hairs and reproductive bodies, to scattered 

 sori, to scattered conceptacles, and finally to apically placed 

 conceptacles or to conceptacles on specially developed side branches. 

 All of these structures originate through modification of the super- 

 ficial layer of the thallus. 



Acknowledgment is due to Professors Coulter and Chamber- 

 lain for their many helpful criticisms throughout the progress of 

 this work. 



University of Chicago 



LITERATURE CITED 



1. Agardh, C, Species Algarum. 1. Gryph. 1823-1828. 



2. Agardh, J. G., Species, genera, et ordines Algarum. 1. London. 1S4S. 



3. Barton, E. S., A systematic and structural account of the genus Turbi- 



naria. Trans. Linn. Soc. London II Bot. 3:215-226. pis. 14, 75. 1891. 



4. — — , On the structure and development of Soranthera. Jour. Linn. 



Soc. Bot. 33:479-486. ph. 23,24. 1898. 



5. — — , On the fruit of Chnoospora fastigiala. Jour. Linn. Soc. Bot. 33: 

 507-508. pi. 28. 1898. 



6. Bower, F. O., On the development of the conceptacle in the Fucaceae. 

 Quart. Jour. Micr. Sc. 20:36-49. pi. j. 1880. 



7. Falkenburg, P., Die Algen im weitesten Sinne. Schenk's Handbuch der 

 Botanik 2:159-314. Breslau. 1912. 



8. Farlow, W. G., List of marine algae of the U.S. Proc, Amer. Acad. 

 10:351ft'. 1875. 



9. Farmer, J. B., and Williams, J. L., Contributions to our knowledge of 

 the Fucaceae; their life history and cytology. Phil. Trans. Roy. Soc. 

 London B 190:623-645. pis. 19-24. 1898. 



10. Greville,R. K., Algae britannicae. Edinburgh. 1830. 



11. Holtz, F. L., Observations on Pelvetia. Minn. Bot. Studies 3:23-45. 

 pis. 7-12. 1903. 



12. Kjellman, in Engler and Pkaxtl, Die natiirlichen Pflanzenfamilien 1*: 



1897- 



13. Kutzing, F. T., Phycologia generalis. Leipzig. 1S43. 



14. Leitgeb, H., Untersuchungen liber die Lebermoosc, Heft IV. Die 

 Ricieen. pis. 1-9. 1879. 



15. Luerssen, C, Handbuch der Syst. Bot. 1 : [879. 



16. Mitchell, M. O., On the structure of Hydroclathrus. Phyc. Mem. 2. 

 53"56. pi. 14- 1893. 



