ij5 natural history bulletin. 



Tathrina iihui Fuckel. 



Johanson "85. Sadebeck '90. 



'87. " '93. 



Saccardo '89. 



This species has not before been credited to North Amer- 

 ica. I find it upon the leaves of Ulniits aniericana collected 

 at West Hann. Conn., by Mr. R. Thaxter. 



Upon comparison with European forms and Sadebeck's 

 description there seems no doubt of the identity of the species. 

 Upon the material which had been collected from May-Juh' 

 the spores were fully formed, but the hypha; had not yet 

 been used up in the formation of the ascogenous cells, and 

 their attachment could be plainly observed. The asci are 

 rather small, 8-10 x 12-20;/ the length not being more than 

 twice the breadth. 



The height of the stalk-cells may be only 3-6/i but their 

 breadth mav equal that of the asci. The normal number of 

 spores is eight, though often there are only four. Their 

 diameter is about 3// . Conidial formations occur in the asci. 

 For the comparison of this species I studied Tafhrina tihut 

 upon leaves of Ulmiis canipcstn's from Prof. Sadebeck and 

 material from several foreign herbaria as well as the fol- 

 lowing cxsiccati: Exoasciis uhni, Rabenhorst-Winter, Fungi 

 Europa?i 3264, and C. Roumeguere, Fungi Gallici exsiccati 

 3060, each upon living leaves of the above host; and E. idiiii 

 upon Uliuiis cifusa. Krieger, Fungi Saxonica, 622. 



III. M A G N U S I E L L A. Sadebeck. 



Magnusiei.la potentill.^ {^FarJozv) Sadebeck. Plate IV. 

 Fig. 2. 



E.xoasais deformans, var. fotentiUcv Farlow. 



Ellis '79. 

 Farlow '83. 



Taphrina potent iUi2 Johanson "85. 



Robinson '87. 

 Ellis '89. 

 Sadebeck '90. 



