Aiitcuitromyces. i 2 r 



nating teleutospores on bean, pea {Pisum sativuin)^ and two vetch 

 seedlings. Although the teleutospores were germinating very freely, 

 yet they produced no result. In 1888 two further series of cultures 

 were made with U. fabcr on bean, pea, Vicia sativa, cracca, La/kyn/s 

 pratejisis^ and Enmtn hirsutiiin. No ascidiospores were produced 

 except upon the bean and the pea. The fecidium on the bean occurs 

 on white spots, which are thickened and very conspicuous. On pea 

 the spots are pale dirty yellow, and the pseudoperidia few and scattered, 

 while on bean they are numerous and crowded together. There can 

 be no doubt that U. fahcp and crvi are biologically distinct, but the 

 1888 cultures show that continued investigation will probably lead to 

 further subdivision of the forms now grouped under U.fabce. 



De Bary says that in some instances the same mycelium which 

 produces the ascidia of U. fabce gives rise to a few isolated uredo- 

 spores. 



Uromyces orobi. (Pers.) 



^cidiospores — Spots scattered or circinate. Pseudoperidia flat or 

 slightly prominent, with torn whitish edges. Spores sub- 

 globose or polygonal from mutual pressure, orange, echinulate, 

 i6-27/A in diameter. 



Uredosp07-es — Sori small, crowded or scattered, soon naked, elon- 

 gated on the stems. Spores subglobose or ovate, echinulate, 

 yellowish, 15-28 x 16-22/t. 



Teleutospores — Sori roundish or elongate, very dark brown, at first 

 covered with epidermis^ Spores oblong or subpyriform, api- 

 culate above, often obliquely, from a thickening of the 

 epispore, dark brown, smooth, 25-40 x 18-28/x. Pedicels 

 very long, persistent, pale brown. 



Synonyms. 



Uro?nyces orobi (Pers.). Winter in Rabh., " Krypt. Flor.," 

 vol. i. p. 158, in part. 



Vadium orobi, Pers. Romer, " New Mag.," vol. i. p. 92. 



Aicidium orobi, D. C. Cooke, " Hdbk.," p. 542 ; " Micro. 

 Fungi," 4th edit., p. 197. Berk., " Eng. Flor.," vol. v. p. 378. 



P2(ccinia fabcB. Johnst., " Flor. Berw.," vol. ii. p. 197. 



Exsiccati. 



Vize, " Micro. Fungi Brit.," p. 327. 



On Lathyrus macrorrhizus {Orobus tuberosus). 

 July to October. 



