162 
CHARLES B. PLOWRIGHT. 
Uromyces dactylidis, Ottb. — In 1861 Ottli 1 described 
this Uromyces as occurring upon Dactylis glomerata 
accompanied by its uredospores. He describes the latter, but 
makes no allusion to their being associated with paraphyses, 
while upon the contrary, in another part of the same commu- 
nication, 2 he describes an Epitea on Dactylis with “ colourless, 
clavate, rather short epiphyses/ 5 In 1873 Schroter discovered 
that U. dactylidis has its aecidiospores upon Ranunculus 
bulbosus. In 1878 he states 3 that the secidiospores occur 
not only on R. bulbosus, but also upon R. repens, L. ; 
R. acris, L. ; R. polyanthemos, L. Winter, 4 more recently, 
while giving the same secidial host plants, states that the 
Uromyces occurs not only upon Dactylis glomerata, but also 
upon PoanemoralisjL.; Festucaelatior, L., and A vena 
elatior, L. 
Both these last-named authors consider the uredospores of 
the Dactylidis to be characterised by the possession of capitate 
paraphyses. Near King’s Lynn Uromyces dactylidis 
occurs in one locality sufficiently near for me to obtain 
material for experiment and also to watch its growth as it 
occurs naturally. 
Seven attempts made to produce the Uromyces upon Dactylis 
from the spores of the iEcidium in R. repens uniformly failed 
(29, 30, 119, 122, 131, 153, 154), and conversely, five attempts 
to produce the iEcidia upon R. repens from the teleutospores 
of the Uromyces also failed (118, 244, 254, 270, 290). The 
aecidiospores applied to Poa nemoralis (143) also pro- 
duced no effect. But when the germinating teleutospores of 
this Uromyces were placed upon R. bulbosus they invariably 
gave rise to the iEcidia (248, 269). In order to see whether 
this fungus had its iEcidia upon any other of the commoner 
species of Ranunculus duplicated experiments were performed 
on R. acris (250, 271), R. ficaria (251, 255, 272), and 
1 Of tli, in ‘ Mittheilungen der Naturf. Gesselscliaft,’ Berne, 18G1, p. 85. 
2 Ottli, loc. cit., p. 81 . 
3 Schroter, in * Cohn’s Beitrage,’ Band iii, pp. 58, 59. 
* Winter, ‘ Rabenkorst’s Kryptogamen Flora,’ 1881, p. 162. 
