56 EXPERIMENTS UPON THE HETERCECISM OF THE UREDINES. 
9) laid upon it ; on 15th June Uredo caricis made its appearance, 
and by 1st July it had affected many of the Carex leaves. 
Exp. 49. — Three scions of Carex hirta from South Wootton 
were on the 26th May infected with spores of ^Ecidium urticce ; on 
3rd June sickly spots were noted, which five days later (on 8th) 
were the site of Uredo pustules. On 21st all the plants were 
affected with the Uredo. 
Exp. 26 (1881). — Four plants of Carex hirta were infected on 
21st July with /Ecidium urticce , and four similar plants kept as 
checks. On 15th August Uredo appeared in two of the infected 
plants. The check plants remained free from the fungus, as did 
33 other individuals of Carex hirta growing in the same garden. 
Puccinia magnusiana and sEcidium rumicis. 
Exp. 18. — Two plants of Rumex hydrolapathum and two of P. 
ohtusifolium were planted in a large flower pot, and surrounded with 
leaves of Phragmitis communis, on which the teleutospores of last 
year’s Puccinia magnusiana, were abundant. The pot was covered 
with a bellglass, and freely watered. On 3rd June red spots 
appeared on the leaves of the R. hydrolapathum , which, by the 6th 
June, developed into perfect sEcidium rumicis. No sEcidia 
appeared on the R. ohtusifolium. 
Exp. 32. — Three plants of Rumex hydrolapathum were similarly 
surrounded with reed leaves on 15th May. On 6th June perfect 
JEcidium rumicis was developed on all three plants. 
yEcidium rhamni and Puccinia coronata. 
Exp. 55. — A flower pot of seedling oats were infected on 7th 
June with sEcidium rhamni. On the 10th July there was an 
appearance like Uredo. On 10th August the Uredo of Puccinia 
coronata was gathered. 
Exp. 76. — A number of oat seedlings were on 23rd June in- 
fected with sEcidium rhamni. On 12th June Uredo of P . coronata 
appeared. 
JEcidium tussilaginis and Puccinia poarum. 
Exp. 84. — Four plants of Poa annua were on 29th July infected 
with s. Ecidium tussilaginis. On 10th July Uredo appeared, and on 
the 18th the perfect Puccinia , which had hitherto not been recorded 
as British. 
Exp. 85. — Three plants of Poa annua were on the 29th June in- 
lected with ZEcidium tussilaginis. On 10th July the Uredo and 
on the 18th the Puccinia appeared. 
Exp. 86. — A number of plants of Poa annua in a pot were in- 
fected with the ^ Ecidium on 29th June. On 10th July the Uredo , 
and on the 18th July the Puccinia appeared.* 
* Note Poa annua is a common weed in the garden in which these ex- 
periments were pei'formed, as it is in every garden, but on no other plant 
of this grass could the Puccinia be found, although careful search was 
made, except those upon which the spores of A Ecidium tussilaginis had been 
placed. 
