213 



irregularly confluent, oblong, or linear 0.2-0.4 rnm. wide by 0.5-1 

 mm. or more long, early naked, compact, pulvinate, dark choco- 

 late-brown; teliospores broadly ellipsoid, or obovoid to nearly 

 globoid, 15-21 X 23-39/x, rounded or obtuse at both ends, the 

 wall chestnut-brown, usually with a slightly paler umbo, about 

 I.5-2/X thick, much thicker at apex, 5-10/.1; pedicel tinted, rather 

 stout, once to twice length of spore. 



O and I on Plantaginaceae : Plantago aristata Michx., Missouri 

 {Galloway) , Texas {Long) ; P. eriopoda Torrey , Montana {Kelsey) , 

 Wyoming {Nelson) ; P. Purshii R. & S., Nebraska {Bates), Texas 

 {Long); P. Rugelii Dene., Missouri {Galloway); P. Tweedyi A. 

 Gray, Montana {Jones), Wyoming {True); P. virginiana L., Illi- 

 nois {Seymour), Missouri {Galloway), South Carolina {Ravcnel). 



II and III on Poaceae: Aristida basiramea Engelm., Kansas 

 {Carleton), Nebraska {Bates); A. dichotoma Michx., Arkansas 

 {Bartholomew) , Kansas {Norton & Thompson) ; A . oligantha 

 Michx., Kansas {Bartholomew), Texas {Long); A. purpurascens 

 Poir., Alabama {Stone), Kentucky {Short), New Jersey {Ellis). 



Type collected at Wakeeney, Kansas, on Aristida oligantha, 

 Sept. 15, 1906, E. Bartholomew (Barth. Fungi Columb. 2JQo). 



The uredinia of the Uromyces Aristidae Ellis & Ev. have para- 

 physes intermixed with urediniospores, the urediniospores are 

 ellipsoid, 23-26 by 27-30^1, the wall is 2.5-3^ thick, finely and 

 bluntly echinulate, and has 5-7 scattered pores. 



Spartina is one of the most interesting genera of grasses from 

 the mycologist's point of view on account of the unusually large 

 number of species of rust which inhabit it. At least three species 

 of Puccinia and two species of Uromyces have been described 

 on it.* The validity of the three species of Puccinia is unques- 

 tionable but this can not be said of the Uromyces-iorms. It is 

 debatable whether U. acuminatus Arth. and U. Spartinae Pari, 

 should be regarded as two species or whether they represent races 

 of a single, somewhat variable, species. The results of culturesf 

 might perhaps be interpreted as grounds for keeping the two 

 forms separate but morphologically they intergrade in such a 

 way as to throw doubt on that disposition. Without attempting 



* For an account of the species inhabiting Spartina see Bot. Gaz. 34: 1-20. 1902. 

 t See Mycologia 2: 221-222, 229. 1909. 



