94 British UredinccB and UstilaginccE. 



siderable period of soaking in water. The germ-tube was 

 larger than in any of the other species of Urocystis the 

 germination of which I have watched ; the promycelial 

 spores were also not only larger, but more numerous. I 

 counted as many as eight on some of the promycelia (Plate 

 VII. Figs. 34, 35). 



U. anemones. — Von Waldheim * points out that unless 

 the promycelium grows in the air no spore-formation 

 takes place. At its end it divides into three or four 

 branches, which become spores. They are elongated, oval, 

 and generally wider at their upper end. In length, they 

 measure from lO to 14^ ; and in breadth, from 3 to y^\x. 

 They become vacuolate, and enlarge in size till they often 

 measure 22 by 4/,(. After several hours' (forty-eight and 

 more) immersion in water, in November and December, I 

 found the teleutospores germinated. The promycelial spores 

 were of the same size and form as described by Von Wald- 

 heim (Plate VII. Fig. 31); I also observed they became 

 vacuolate when old (Figs. 32, 33). The promycelial spores 

 were applied to the foliage of Ranunculus repens, in two 

 experimental cultures, on December 12, 1884. No change 

 was observed in the plants until February, when it was 

 noted that they showed signs of the formation of spore- 

 beds. On February 1 1 in one experiment, and on the 

 22nd in the second, spores were developed. This is one 

 of the few species in which mycelium is localized, and the 

 infection of the host-plant occurs at the same place at 

 which the teleutospores are subsequently formed. 



U. violcB. — The spore-balls generally produce only one 

 promycelium, which bears at the end a cluster of five or 

 six fusiform spores. If the promycelium remain short, 

 spores arc produced ; but if it grow to any great length, 

 either no spores at all are formed or only small ones. Of 



* Waldheim, loc. (it. 



