MacDougal : Symbiosis and Safrophytism 529 



the higher plant as the organism of the leguminous tubercle, is not 

 capable of general application. Such relation has been proven be- 



'pus 



only, 



VII. Two types of cndotropic mycorhizas may be distin- 

 guished; one adapted for nitrogen fixation, and a second for the 

 absorption and modification — perhaps oxidation — of the soil prod- 

 ucts before liberation in the tissues of the higher plant. The ex- 

 tension of information \\\\\ doubtless result in the further division 

 of the second type. 



Literature to which Reference is made. 



T. Bonnier and Mangin : Recherches sur la respiration des tissues 

 sans chlorophyll. Ann. Sc. Nat. VI. i8 : 203. 1884. 



2. Engler u. Prantl : Die naturl. Tflanzenf , 2 : 11. . 



3. Pfeffer: Pflanzenphysiol. i : 349. 1897. 



4. Heller : New plants from western North America. Bull. Torr. 

 Bot. Club, 25 : No. 4. April, 189S. 



J 



Jard. d. Buitenzorg. 14: 53. 1896. 



J 



Corallorldza iniiata R. Br. and its my- 



•corhiza. 



']. 1S99. 



Johow 



Tahrb 



445. 1885. 



8. Lory: Sur la respiration et la structure des Orobanches, et 

 autres plantes vasculaires deporvues de partes vertes. Ann. Sc. Nat. 

 III. 8: 158. 1847. 



9. Lundstrom : Einige Beobachtung ueber Calypso borealis. Bot. 



Centralb. 38: 697. 1889. 



MacDougal 



Am. Nat. 33 : 



210. 1899. 



IX. MacDougal: Symbiotic saprophytism. Ann. Bot. i : i. 1899. 



12. Nobbe u. Hiltner : Die endotropische Mycorhiza von Podo- 

 carpus, und ihre physiologische Bedeutung. Landw. Versuchssta. 51 : 



241. 1898. 



13. Reichenbach : Orchidiographische Beitrage. Linnaea, 41 : 53. 



1877. 



