97 
been able to confirm Rostrup’s statement that Coma Euonymi 1s 
related to the Melampsora on Salix cinerea. This I was enabled to 
do by the kindness of my friend, Mr. E. J. Tatum, of Salisbury, 
who took me in June last to a locality near, that city, where we 
were able to gather a few specimens of the Coma. Although the 
season was rather advanced, yet I applied these to a plant of Salix 
cinerea, which I had growing in my garden, with the satisfactory 
result of producing the uredospores in question. 
Mr. Tatum has further been fortunate enough to find Coma 
confluens on Ribes grossuluria in the near neighbourhood of a number 
of Salices. I have therefore hope, at some future time, to confirm 
Rostrup’s and Nielsen’s statement that this fungus is connected 
with one of the Melampsore. These two cultures would be par- 
ticularly interesting to me since many years ago | attempted their 
performance with teleutospores of certain Melampsorz, collected in 
Norfolk, but with absolute non-success. We have here, then, one 
other instance of the complexity of the life histories of the Uredinez, 
and again have to decide whether they be species or spore-forms that 
we are dealing with. 
I must briefly allude to the life history of one of our commonest 
Melampsore, namely, that on Birch. As will be seen by the table, 
Coma Jaricis has been found to consist of a host of different species, 
on poplar, aspen, and various willows. As it occurs with me, I find 
it, as I have elsewhere shown, related to AZ. betuline, and as far as my 
cultures have hitherto gone, with nothing else, with one exception. 
Klebahn considers that the microscopic structure of my Larch-birch 
Czoma is so distinct from the Larch-poplar and Larch-willow species 
as to merit placing it in a genus by itself on account of degree to 
which its peridium cells are developed; in fact, it is an A‘cidium 
rather than a Czoma. He proposes to call it Melampsoridium 
betulinum. 
The exceptional case was a culture I made this year with some 
teleutospores on the leaves of Populus alba Mr. Tatum sent me from 
near his residence. In this case the germinating teleutospores gave 
rise to yellow spots, which proved on microscopic examination to be 
pyenidia on Larix Europaea ; but, unfortunately, the plant died before 
the fungus had time to develop. ‘This was the only successful result 
I obtained from seven cultures of Melampsora on Populus alba. In the 
appended list of the British Melampsore it is remarkable how 
many have their Czomata on Larch. On the Continent the 
Czomata of Melampsora tremule occur on Larch, Mercurialis 
perennts, Uhelidonium majus, Pinus sylvestris, and Corydalis sp. 
Melampsora pustulata, or as it is more commonly now called, 
Pucciniastrum pustulatum (Pers.), a species not very uncommon in 
some parts of the country, has been shown by Klebahn to have its 
zcidiospores on Abies pectinata, a not very abundant tree with us. 
