57-12 



Proceedings of the American Academy of Arts and Sciences. 

 Vol. 57. No. 12.— June, 1922. 



CONTRIBUTION FROM THE CRYPTOGAMIC LABORATORIES OF 



HARVARD UNIVERSITY. 



LXXXIX. A REVISION OF THE ENDOGONEAE. 



By Roland Thaxtee. 



With Four Plates. 



■^■&. 



