78 A. Barclay — A Descriptive List of the Uredineae [No. 2, 



when first coming to notice are about 5 m.m. in diameter, and then bear 

 but a few spore pustules on the lower surface ; but as they grow older 

 they enlarge, become paler, and therefore more conspicuous, bear very 

 numerous minute pustules, still mostly on the lower surface, but a few 

 isolated ones on the upper surface also. An old patch may attain a 

 diameter of 1 cm. A single leaf may bear from 1 to 30 patches and 

 even more. The spore pustules are minute brown sori, with the spores 

 fairly adherent. If these spores be examined they are found to be 

 teleutospores ; there are no uredospores. A careful search over both the 

 upper and lower surfaces of patches disclosed no spermogonia, even on 

 the youngest. 



Each spore is pale brown, with a small portion of stalk adhering, 

 much thickened at the apex, and with a clearly defined nucleolar space. 

 Through the apical thickening a germ pore may be seen. The free end 

 of the spore is usually rounded, but is sometimes conical, and may even 

 be pointed. The surface of the spore is smooth. The fresh spores 

 examined in water measure 27 to 30 by 17/>t, the apical thickening being 

 lOfx, These spores germinate at once, if placed in water in a vs^atch 

 glass, in the usual way, producing four sporidia on long narrow sterig- 

 mata. The sporidia are round to oval, measuring from lOjx in diameter 

 to 12 X 10/x. These also germinate readily. If the spores are placed in 

 a hanging drop of water, with very little air, the peculiar germination 

 described by Kienitz-Gerloff as occurring in Gy mnosporangium spores 

 takes place. That is to say, the end of the promycelium breaks up into 

 three or four cells, which become detached, and which further germi- 

 nate by throwing out a germ tube. I have already described this in a 

 paper on the life history of Gceoma Smilacis, the teleutospores of which 

 exhibit the same phenomenon.* These detached cells, which apparently 

 act as sporidia, measure from 8 X 8 to 18 x 9/x, or on an average of several 

 measurements 14*0 x 8'lfi, 



d. MICRUROMYCES, Schroter. 



5. Uromyces Strobilanthis, nov. sp. 



On Strobilanthes Dalhousianus, Clarke. 



In autumn the leaves of this host bear numerous pustules on the 

 lower surface. Whilst it is common in some years it is rare in others. 

 I could not, for instance, find any in 1889. The spores are very firmly 

 adherent to their beds and when scraped off retain a portion of stalk. 

 They are more or less elongated bodies, reddish brown by transmitted 



* Scientific Memoirs by Medical officers of the Army of India, Part IV, 1 889. 



