
; = 
Cx BATE = a 
a : ae REA 
a ” rs - re ee 5S Se arr rae 
rea age eT aaa areal aig Ne a SE ——- 
aire arora 
nearer 


96 
lower leaf surfaces. That this result was due to the teleutospores 
there cannot be much doubt asthe infected plant was one of 
some dozens on none of which were any similar decoloration 
observable although careful search was made. 
The zcidiospores on the orchis were mature early in June and 
on the 16th were applied to two healthy plants of Phataris 
arundinacea which on the first July had uredo spore sorl 
developed on them. 
1251. ee Bitch ! Orchis mascula? 31 March 
1270. 4 e » _ latifolia 10 May 19 May 
1277: - Arum maculatum 10 May 
i278. - 5 Allium ursinum 10 May 
1279. = 5 Convallaria majalis 10 May 28 May 
1302. Aicidium orchidis Phalaris arundinacea 16 June I July 
1263. ‘5 ‘3 - 55 16 June 1 July 
In 1866, Cérsted, of Copenhagen, showed that the three common 
Gymnosporangia were connected with the three common Restelha. 
Subsequent work showed the existence in England of a fourth species 
G. confusum, while on the Continent Hartig has demonstrated the 
association of a fifth G. tremellodes with the Restelia on the apple. 
These last two species are found to have these A®cidiospores on 
several hosts. So far G. tremelloides has not been recorded in Britain, 
but its existence is worth bearing in mind. 
After the lapse of eight years, Wolff showed the connection between 
Peridermium piniand Coleosporium senecionis. Between the years 1881 
and 1888 I repeated Wollff’s experiments of putting the spores of 
Peridermium pini on Senecio eleven times, once only with success. 
The problem was attacked by Klebahn, who showed that other 
Coleosporia besides C. senecionis had their zcidiospores on Pinus 
sylvestris: his work has been supplemented by E, Fischer. The 
result of their investigations will be found in the appended list of 
British Uredinez. 
As early as 1883 Rostrup and Nielsen pointed out the connection 
between the Coeomata and the Melampsore, and I attempted the 
repetition of their work, but with little success. I did succeed in 
producing Cama mercurialis on M. perennis from a Melampsora on 
Poplar, but 1 was misled as to the species of poplar, being unfor- 
tunately told by the late Mir. Br Actom that it was P. alba, 
whereas the leaves in question subsequently proved to be those of 
a young plant of P. tremule, he having been misled by their 
pubescence. Hence I erroneously referred the Melampsora t0 
M. acidioides. 1 am glad of the present opportunity of correcting 
my error. In 1888 I worked out the life history of the Cama on 
Orchis maculata, but it was not until the present year that I have 

