98 A. Barclay— A Descriptive List of the Uredineee [No. 2, 



1. Uredo Eupatoriae, (D. C.) ? 



On Potentilla (Kleinicura, W. and A. ?) 



This host may sometimes be found in July extremely attacked by 

 a uredo bearing fungus. Brilliant orange red or yellow pustules may 

 be found in great numbers on the stem, leaves, petioles, bracts, and even 

 fruit. The spores are brilliantly orange red, irregularly round, beset 

 externally with spines or tubercles, measuring on an average 20//. in 

 diameter when fresh. When placed in water they germinate readily, 

 and normally like uredospores. 



2. Uredo Bupleuri, nov. sp. 



On Bupleurum falcatum, L. 



In September this may be found attacked. Numerous minute 

 brown circular pustules are borne on the lower leaf surface, with some 

 irregular discolouration on the opposite or upper leaf surfaee. The host 

 is at this time in full flower. The spores are brown, round, measuring 

 when fresh 20/x in diameter, with an epispore studded with shallow 

 warts and with three germ pores usually, but sometimes four. "When 

 placed in water they germinate l-eadily in the usual manner of uredo- 

 spores. Though I have examined pustules up to the time the host dies 

 and is withered up I never saw any other form of spore. 



3. Uredo Cronartiipormis, nov. sp. 



On Vitis himalat/ana, Brand. 



This host is very extensively attacked with a peculiar uredo-like 

 affection, suggestive of Cronartium, since the spores are aggregated 

 together into small cylindrical columns, with numerous curved para- 

 physes at the bases of the columns. The whole, column of spores and 

 paraphyses, are borne on minute papillae on the lower leaf surface. 

 The column of spores is about 1 to 2 m.m. in length, and 0T9 to 

 - 25 m.m. in diameter. 



The parasite is first met with towards the end of July, but conti- 

 nues to increase in abundance until the leaves fall off in autumn (Octo- 

 ber and November). The pustules are exceedingly small, and are 

 distributed in immense numbers all over the lower surface of the leaf 

 blade. The upper surface of the leaf is studded with reddish brown 

 stains which makes this otherwise inconspicuous fungus remarkable. 



When these columnar heaps of spores are scraped off, which may 

 very easily be done with a light touch, and placed in water, they readily 

 break up into their component elements, and the weight of a cover glass 



