DopGE: STUDIES IN GENUS GYMNOSPORANGIUM 291 
GYMNOSPORANGIUM ELLISII 
Fromme (6) connected Gymnosporangium Ellisii with a oosatvai 
myricatum. Dodge and Adams (5) found the aecidium on 
Comptonia asplentfolia. Attempts were made to infect Comptonia 
in 1915 and 1916 without success. The plants brought in March 
25, 1917, leaved out in about two weeks and were inoculated April 
12. The spermogonia appeared April 1 on several leaves. By 
May 14 the peculiar ram’s horn twist of the leaves was very strik- 
ing. Absence prevented further observation of the infected plants 
but at least two of them matured aecidia. 
Certain seedling plants of Chamaecyparis were sprayed with 
aecidiospores from Myrica in 1915 and othersin 1916. The cedars 
in the first lot showed no signs of infection in 1916, three years 
after they had been exposed to natural infection. The second lot 
consisted of small seedlings, one to three inches high. The results 
of these experiments are given in TABLE IV. 
TABLE IV 
INFECTION OF Chamaecyparis thyoides wiTH G. Ellisit 
A. Inoculation, 1915 
fi Results 
No. ys orton | Controls 
1916 1917 1918 
345 June 21 — + 5 Infec + Eighteen xepac A prions: sat 
349 June 21 -_ ~ - exposed in the e greenhou 
400 June 21 = oe + s greed rat 
404 June 21 - - _ spores were being shed, but they 
406 June 21 _ peg + | were n y 
410 June 21 _ Se ee + Sear chambers. Only 
420 June 21 - i401 , No. 431, bécame “Se 5 
426 June 21 — - - On ne sorus sri d on young 
433 June 21 a en nae | + | growth of a branc 
436 June 21 - - | =-— 
B. Inoculation, 1916 
906 April 24 - | _ oo | sy eg similar plants 
907 April 24 oe + + | were sed, but not pada 
908 April 24 eee. _ + /in it infection ram me. No 
909 April 28 ete + | fection has appeared on paces 
914 | May 4 ee oe + | plants. 
O15 May 4 eet rote - 4 
916 May 4 —- |- + | 
918 May 17 - | — — 
953 June I ~ Plant died 
954 June 1 | oe = 
955 ex os + 
956 June 1 - a oe 
957 June 1 - aS a4 
958 June I _ = ee 
