256 



Mycologia 



October 13, 1920, sporidia from telia on Euthamia gramini folia, 

 collected the same day near Chain Bridge, D. C, were used to 

 inoculate trees of the following species in pots sunk in beds outside 

 of the greenhouses : 1 Pinus canariensis C. Smith, 3 P. caribaea, 

 7 P. contorta, 3 P. coulteri, 2 P. echinata, 1 P. edulis, 1 P. glabra, 

 1 P. mayriana and 2 P. scopulorum. Of these the following were 

 infected, bearing mature pycnia in March and mature aecia late in 

 April, 192 1 : 1 P. caribaea, 1 P. coulteri and 2 P. scopulorum. 



The pycnial stage of Coleosporium delicatulum resembles closely 

 that of C. solidaginis but the pycnial areas of the former are much 

 brighter colored. The aecia differ quite widely in appearance. 

 The difference in gross morphology between C. delicatulum and 

 C. solidaginis is shown by the following table : 



Table of Comparison 



Coleosporium delicatulum Coleosporium solidaginis 



Pycnia solitary or few, in one or Pycnia solitary or few, aggregated 

 two more or less extended rows, in one or two short rows, grenadine- 

 orange-chrome to English-red when red to mahogany-red when fresh, on 

 fresh, on conspicuous, brightly-red- inconspicuous, slightly-reddened spots, 

 dened spots. Aecia conspicuous, solitary or few, 



Aecia inconspicuous, solitary or aggregated in one to three short rows, 



few, in one or two more or less ex- Peridia rupturing at the apex with 



tended rows. irregular edges. 



Peridia rupturing on the sides with 

 recurved lacerate edges. 



Coleosporium delicatulum, according to our records, has been 

 collected in the United States as follows : 



O and I on Pinus: 



P. caribaea : Florida and Louisiana. 



P. echinata: Maryland, Pennsylvania and South Carolina. 



P. mayriana : District of Columbia. 



P. nigra poiretiana Schneid : Pennsylvania. 



P. palustris : Florida, Georgia, Mississippi and South Carolina. 

 P. resinosa : Vermont. 



P. rigida : Connecticut, District of Columbia, Maryland, Massachusetts, New 

 Jersey, New York, North Carolina and Pennsylvania. 



P. serotina: Florida, Georgia, New Jersey and South Carolina. 



P. taeda : Florida, North Carolina, South Carolina, Virginia and Texas. 



II and III on Euthamia: 



E. caroliniana: Florida and New Jersey. 



