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CONTRIBUTION FROM THE CRYPTOGAMIC LABORATORIES OF 



HARVARD UNIVERSITY. 



LXXXIX. A REVISION OF THE ENDOGONEAE. 



By Rol.vnd Thaxter. 

 Received March 17. 1922. Presented April 12, 1922. 



In preparing the present Contribution concerning the Endogoneae 

 it has not been my intention to consider the subject in all its aspects, 

 phylogenetic, cytological and other; and this revision has been under- 

 taken chiefly with a view to the improvement of the systematic status 

 of the family. For although relatively small, it has not escaped the 

 taxonomic confusions and uncertainties which so frequently beset the 

 path of the systematic mycologist, and it has seemed worth while to 

 make at least an attempt to clear up some of the moot points relating 

 to it, and at the same time to add such new information as I have been 

 able to accumulate from personal observation or otherwise. I have 

 therefore endeavored to obtain authentic information in regard to as 

 many of the known forms as possible, and personally to examine as 

 complete a representation of the type-material as could be assembled. 

 Such value as this account possesses is therefore largely due to the 

 courtesy of correspondents who have been so kind as to assist me in 

 accomplishing these objects; and in this connection I desire to express 

 my great obligation to Professor Abrams, of Leland Stanford, who has 

 allowed me to examine all the Harkness types of Endogone in the 

 University Herbarium: to the Abbe Bresadola, who has sent me a 

 specimen of his E. reniformis collected by Rick in Brazil: to Dr. C. W. 

 Dodge for Californian material collected by himself and by IVIr. H. E. 

 Parks: to Professor E. C. Jeffrey for a very interesting collection from 

 Little Metis, Quebec, given to me many years ago: to Professor G. 

 Lindau for the privilege of examining portions of all the types of 

 Hennings and Bresadola in the Berlin JMuseum; to IMr. C. G. Lloyd 

 for a portion of his Endogone tuberculosa and other interesting forms; 

 to Professor O. Mattirolo who has sent me for examination specimens 

 of all his material of Endogone, including the types of E. Pamyaloniana 

 and E. Tozziana; to M. N. Patouillard for confirming my determina- 

 tion of his E. lignicola and for portions of the types of Acker mannia 



