298 DopGE: STUDIES IN GENUS GYMNOSPORANGIUM 
fully chosen sori of G. fraternum and 50 aronias with G. transfor- 
mans without the infection of control plants used in either case. 
So far as color, size and thickness of walls are concerned, one 
finds sori made up of intermediate types of spores not so easily 
identified. Compare Fics. 3 and 5 (G. transformans) with Fic. 7 
(G. fraternum). On the contrary, such types as are shown in 
Fic. 6 (G. transformans) and Fic. 8 (G. fraternum) are easily dis- 
tinguished. Spores of G. biseptatum are shown in FIGs. 9 and 10 
for comparison. G. fraternum does not become G. biseptatum 
when grown in the greenhouse. 
INFECTION OF CHAMAECYPARIS WITH G. TRANSFORMANS 
The ninety-eight seedling plants of Chamaecyparis described 
in connection with cultures of G. Ellisii (Table IV, B) were used 
for this work. None of them developed rust in 1916. Most of 
them had no branches and only subulate leaves when brought in 
(1915). All new growth could be determined readily. Twenty- 
four plants were inoculated and seventy-four were kept in another 
greenhouse as controls. The results of these experiments are given 
in TABLE VII. 
TABLE VII 
INFECTION OF Chamaecyparis witH G. transformans IN IQI6 
ee Pe Fae esults, i 
No. ¥ “var oe me ag Controls 
615 May 2, Aug. 28 5 Plants numbered 610- 
617 June 1, Aug. 28 Ir 614, 616, 620, 625, 629, 
618 June 1, Aug. 28 2 790-798, 906, 908, 909, 
619 July 16, Aug. 28 ‘3 914-921, 948-9 , 963- 
621 June 1, Aug. 28 z 992, 1012, 1014 re- 
622 Apr. 24, Aug. 28 I mained entirely free from 
623 July 23, Aug. 28 5 this rust in 1917 and 1918 
624 pr. 24, Aug. 28 3 
626 Apr. 24, Aug. 28 2 
627 Apr. 24, Aug. 28 I 
ts Aug. 2 
628 July 16, Aug. 28 I2 
Jun g. 28 Plant died. 
789 May 7, Aug. 28 ° 
900 Apr. 26, Aug. 28 
Qor Apr. 24, Aug. 28 
902 Apr. 24, Aug. 28 
903 Apr. 24, Aug. 28 
904 Apr. 24, Aug. 28 
905 Apr. 24, Aug. 28 
A 
to 
COR HF OMHO 
g. 28 
910 May 2, Aug. 28 
OIL May 2, Aug. 28 Ir 
912 May 2, Aug. 28 Plant died. 
013 May 2, Aug. 28 oO 
