AMERICAN UREDINEiE. 325 



in his latter work, but the cups are fragile and herbarium spec- 

 imens often fail to show the true structure of the uninjured 

 form. 



The ascidiospores are not only remarkable for their thick- 

 ened apices, but for the close morphological resemblance be- 

 tween them and the uredespores. Both have a colorless wall, 

 which is apically thickened, and studded with minute papilla3, 

 and have protoplasmic contents of the same orange hue. 

 The shape is also the same, except that the Eecidiospores, re- 

 ceiving pressure from all sides while forming, are nearer iso- 

 diametric than the uredospores, which are somewhat elon- 

 gated by the greater lateral pressure while in the sorus. 



The record of cultures establishing the connection between 

 the Fraxinus and Sftartina forms may be found in the Botan- 

 ical Gazette (29:275). 



Number 54// of the present distribution is part of the type 

 collection for Puccinia sj>arganioides Ellis & Barth. When 

 first collected and described the host was supposed to be 

 Carex spargauioidcs, afterwards it was considered to be 

 Carex stricta, as stated on the label in Ellis and Everhart's 

 N. A. F. No. 3475? but it is now known beyond question to 

 be S part ina cynosuroides. 



55. Puccinia distichlidis e. & e. (1893. Proc. Phila. 



Acad. Sci. for 1893: 152.) 



55a. On Spartina gracilis Trin. III. Ten-mile Creek, Mont., Anderson. 



Orig. Descr. "III. Sori elongated, 2-10 mm. long and 1-2 mm. wide, 

 erumpent, naked, nearly black. Teleutospores oblong or oblong-ellip- 

 tical, 45-70x15-20//, constricted in tbe middle, pale brown, becoming 

 deep cbestnut brown; epispore smooth, thickened at summit which is 

 either regularly rounded or sub-acuminately or mucronately pointed. 

 Pedicels So-100/i long, stout ( 6-7// thick ) and persistent, yellowish- 

 hyaline." 



SYN: 



1898. Dictcoma distichlidis Kuntze. Rev, Gen. PI, 



3:468. 



V-3 17 



