CERTAIN BRITISH HETERCECISMAL UREDINES. 
153 
affects the various Pose. This he did by a series of artificial 
cultures. He was led to try these experiments from his 
previously obtained knowledge of the life-history of Uromyces 
dactylidis, which he found had its uredo and teleutospores 
upon Dactylis glomerata while its secidiospores occur upon 
Ranunculus bulbosus. The results obtained by Schroter 
were (1) that Uromyces dactylidis, Otth, is produced 
from a Uredo upon Dactylis possessing capitate paraphyses 
having its iEcidiaupon Ranunculus bulbosus and repens. 
(2) That the Uredo without paraphyses and its Uromyces upon 
Poa nemoralis are connected with the iEcidium upon R. 
ficaria. Winter, in his latest work, 1 following Schroter, thus 
gives the relationships of these species. 
Uromyces dactylidis, Otth. 
ibcidiospores on. Teleutospores on. 
Ranunculus acris, L. Arrhenatherum elatius, M.and K. 
„ polyanthemos, L. Poa nemoralis, L. 
„ repens, L. Dactylis glomerata, L. 
„ bulbosus, L. Festuca elatior, L. 
Uromyces poa Rabh. 
iEcidiospores on. Teleutospores on. 
Ranunculus ficaria, L. Poa nemoralis, L. 
„ pratensis, L. 
Cornu 2 has, however, still more recently shown that Ranun- 
culus repens is the host plant of the iEcidium of Puc- 
cinia arundinacea, D. C. He further considers that 
P. graminis, Pers., occurs upon Phragmitis communis 
not unfrequently, when it is characterised amongst other things 
by forming long black lines on the stem. 
Rostrup 3 regards the JScidium on Ranunculus repens as 
being due to Uromyces poae, Rbh. 
1 Winter, * Rabenhorst’s Kryptogamen Flora,’ vol. i, p. 162. 
3 Cornu, ‘Comptes Rendus,’ 26 Juin, 1882. 
3 I regret having mislaid the communication which Mr. Rostrup sent me. 
It was a list of Danish fungi, in which the aecidiospores of Uromyces poae 
were given as occurring upon Ranunculus ficaria and repens. 
