Hedgcock and Hunt: Notes on Coleosporium 253 



5". angustatum : Alabama, Georgia and South Carolina. 

 6". asperrimum : Texas. 



S. asteriscus : Georgia, Louisiana, North Carolina and South Carolina. 



6". compositum : Alabama, Georgia, North Carolina, Tennessee and Virginia. 



iT. dentatum : Georgia, North Carolina and South Carolina. 



5". glabrum Eggert : Georgia and Tennessee. 



S. gracile : Texas. 



5". integrifolium : Alabama, Arkansas, Georgia, Illinois, Indiana, Louisiana, 

 Mississippi and Missouri. 



S. laciniatum : Iowa and Kansas. 

 S. laevigatum : Alabama. 

 S. pinnatifidum : Georgia. 



scaberrimum : Texas. 

 S. terebinthinaceum : Illinois, Indiana and North Carolina. 

 5". trifoliatum : Alabama, North Carolina and Virginia. 



Coleosporium terebinthinaceae has been successfully inoculated 

 upon Parthenium integrifolium, Silphium asteriscus, S. integri- 

 folium, and 5\ trifoliatum. 



The aecial stage of this Coleosporium is a small species, re- 

 sembling somewhat C. laciniariae Arthur, C. helianthi 15 and C. 

 inconspicuum. 



A comparison of the morphology of Coleosporium terebinthi- 

 naceae with that of C. laciniariae follows : 



Table of Comparison 



Coleosporium terebinthinaceae Coleosporium laciniariae. 



Pycnia solitary or few, usually in Pycnia solitary or few, usually ag- 

 short rows, orange-rufous to mummy- gregated, salmon-orange to olivaceous- 

 brown when fresh, on olive-yellow black when fresh, on light-green spots, 

 spots, 0.2 mm. wide by 0.4 mm. long. 0.4 mm. wide by 0.6 mm. long. 



Aecia solitary to few, usually in Aecia solitary to few, usually ag- 



short rows, linguaform to flattened gregated, flattened rhomboidal, 0.4 mm. 



rhomboidal, 1.4 mm. high by 1.1 mm. high by 1.5 mm. long, 



long. Aeciospores 20 by 31 /u with walls 



Aeciospores 20 by 30 fx with walls 2 fx thick. 



3 /x thick. Peridial cells 25 by 40 fx with 



Peridial cells 26 by 53 fx with walls walls 5 fx thick. 



4 fx thick. 



The pycnia of Coleosporium terebinthinaceae are brown and 

 those of C. laciniariae are black at the time when the aecia are 

 beginning to appear. It is possible at this stage to determine most 



1 5 For a comparison with the aecial stages of C. helianthi and C. incon- 

 spicuum, see the " Table of Comparison " on another page of this article. 



