1917] CUNNINGHAM—SEXUALITY OF SPIROGYRA ■ 499 



LITERATURE CITED 



J 



W 



20:430-439- I&&3- 



London. 1848. 

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3. Bennett, A. W., and Murray, G., Cryptogamic botany. London. 1889. 



4. Bessey, C. E., Hybridization in Spirogyra. Amer. Nat. 18:67-68. 1884. 



5- , Note on cross-conjugation. J 



6. . Attemnterl hvhridizatinn hptw* 



Amer. Nat. 19:800-801. 1885. 



* 



7- Chmielewski, V., Bot. Zeit. 48:773. 1890. 



8. Cleve, P. T., Monografi ofer de Svenska arterna Forsok till en af algens- 

 familjen Zygnemaceae. pis. 10. 



9. Cooke, M. C, British fresh water algae. London, pis. 180. 1882. 



io. Coulter, J. M., Barnes, C, and Cowles, H. C, Textbook of botany. 

 Vol. I. New York. 1910. 



11. DeBary, A., Untersuchungen iiber die FamiUe der Conjugation. Leipzig. 

 1858. 



12. DeToni, J. B., Sylloge Algarum. L Chlorophyceae. 725-777. 1889. 

 13- Engler, A., and Prantl, K., Nattirliche Pflanzenfamilien. Leipzig. 1895. 

 14* Haberlandt, G., Quoted by Klebs. 

 15. Hassall, A. H., Ann. Nat. H 



x 6. , Ann. Nat. Hist. 9:34. 



*7- , British fresh w r ater algae. London. 1845. 



18. -, British fresh water algae; rev. in Ann. Nat. Hist. 16:416-419. 



19. Hertwig, O., The cell; c 

 London and New York. i8( 



20. Johnson, D.S., The history 

 N. S. 39:299. 1914. 



Klebahn, H., Bot. Jahrb 



10:336. 



logy 



Science 



22. Klebs, G., Die Bedingungen der Fortpflantzung bei einigen Algen und 

 Pilzen. 1896. 



23. Lotsy, J. P., Vortrage iiber botanische Stammensgeschichte. I. Algen und 

 Pilzen. 1907. 



24. Mottier, D. M., Fecundation of plants. Carnegie Publ. no. 15. 1904. 



25. Oltmanns, F., Morphologie und Biologie der Algen. Jena. 1904. 



26. Robertson, R. A., On abnormal conjugation in Spirogyra. Trans, and 

 Proc. Bot. Soc. Edinburgh 21:185-191. 1899. 



27. Trondle, A., Zeitsch. Bot. 3:593. 19"- 



28. Vaucher, J. P. E., Histoire d'Confervee d'eau douce. 



29. West, G. S., and West, W., Observations on the Cc 

 Botany 12:29-57. pis. 2. 1898. 



30. West, G. S., The British fresh water algae. Cambridge. 1904. 



3i- Wolle, F., Fresh water algae of the United States. 2 Vols. Bethlehem, 

 Penn. 1887. 



Geneva. 1803. 



Ann 



