Hedgcock, Hunt, Hahn: Coleosporium 185 



graminifolia from Auburn, Alabama. He also mentioned its oc- 

 currence on L. chapmani in Florida. Since 1907, the known 

 range of this species of Coleosporium has been greatly extended 

 and a number of additional hosts found (6). 



Peridermium fragile Hedge, and Hunt (7) was first recognized 

 in Florida at Brooksville on the needles of Pinus palustris, March 

 11, 191 5. Numerous inoculations were made by Hedgcock and 

 Hunt during 1915, 1916 and 1917 with the aeciospores of this 

 Peridermium on many plants of species of Aster, Chrysopsis, 

 Elephant opus, Euthamia, Laciniaria, Pharbitis, Solidago, Ver- 

 besina and Vernonia, without results. The plants of Laciniaria 

 used were in poor condition. In the autumn of 1916, the collec- 

 tion of Coleosporium laciniariae on plants in direct association 

 with pine trees which earlier in the season were infected with 

 Peridermium fragile, indicated that Laciniaria was the alternate 

 host genus for this species of Peridermium. Good thrifty plants 

 of Laciniaria were secured and kept in stock. On March 20, 

 1918, Hunt inoculated the leaves of several species of Laciniaria 

 with the aeciospores of this Peridermium from Pinus palustris 

 (25135) at Ocala, Fla., March 15, 1918. 'One plant of Laciniaria 

 graminifolia was infected, uredinia appearing April it, and telia 

 later. On March 4, 1919, Hedgcock inoculated one plant of 

 Laciniaria sp, with aeciospores collected from Pinus palustris at 

 Ocala, Fla., February 27. On March 22, uredinia appeared on 

 the leaves. Telia were noted June 5. In both experiments con- 

 trol plants remained free from the rust. This proves that Peri- 

 dermium fragile Hedge, and Hunt is the aecial stage of Coleo- 

 sporium laciniariae Arthur. 



Coleosporium laciniariae Arthur has been collected as follows, 

 the data being taken from collections in this office. 



O and I. On Pinus: 



P. palustris, Florida, in 1915, Brooksville, March 11 (17426, 

 type of Peridermium fragile), March 11 (17427), March 12 

 (17430) ; in 1916, March 17 (20780, "20781, 20786 and 20787) ; 

 in 1918, March 17 (25163) ; in 1919, March 2 (32161 and 32162), 

 March 3 (32172) ; May 15 (32465) ; Ocala, in 1916, March 16 

 (20775); m r 9i8, March 15 (25135); in 1919, February 28 



