258 British UredinecE and UstilaginecF. 



Biology. — This species occurs upon various species of cultivated 

 iris. To Dr. M. Foster, F.R.S., I am indebted for numerous speci- 

 mens. Repeated examinations at various periods of the year, both on 

 the part of Dr. Foster and myself, have failed to show teleutospores. 

 When applied to /. psetido-acorus and foetidissima, I have almost 

 always failed in obtaining any results. Thiimen's specimen in my 

 copy consists only of uredospores, and is on I.flavissinia from Siberia. 

 Rabenhorst's Uredo iridis on I. puinila ("Fung. Europ.," No. 1674) 

 seems to be the same plant. Dr. M. Foster says, " It came out with 

 me first on /. flavissima, then on /. tolmieana, then on /. iberica, 

 and all the irises from Central Asia ; also on /. spuria, ensataj 

 finally on /. decora, kingii, piimila, filifoUa, and caiicasica. It does 

 not readily attack the broad-leaved Mediterranean forms, such as 

 /. gerinanica, pallida, etc. ; but I am inclined to think that almost 

 every species would take it. I have not yet, however, seen it on 

 /. fcetidissima or psetido-acoriis.'''' 



Uredo phillyreae. Cooke. 



Sori yellow, rounded or elliptical, on yellowish spots, solitary or in 

 clusters. Spores subglobose, ovate, finely echinulate, orange- 

 yellow, 15-18 X I2-I5/A. 



Synonym. 

 Uredo phillyrecB. Cooke, Exs. 



Exsiaati. 

 Cooke, i. 592. Vize, " Fungi Brit.," 142. 



On Phillyrea media. 



Uredo tropseoli. Desni. 



Hypogenous spots, pale yellow. Sori minute, roundish, scattered 

 or confluent. Spores ovoid or subglobose, orange. 



Synonym. 



Uredo tropceoli. Desm., Aim. Nat. Sc, 1836, vol. vi. p. 243. 

 Cooke, Seem. Joiir, Bot., vol. iv. p. 97; '• Hdbk.," p. 528; 

 " Micro. Fungi," 4th edit., p. 216. 



