44 FUNGOID PESTS OF CULTIVATED PLANTS. 



spring before tin buds expand. The soil around may also be 

 rated. 



Syll. vii. 2622; Gard. Chron. -Inly 7. 1877, fig. 5; Mass. PL 

 . ,, 260; i M. I ■ 84, 107; Plowr. Brit. Ured. p. 225. 



Rose Brand. 

 Phragmidium subcorticium (Schr.), n. III. fig. 51. 



Tlii- i< the advanced 3tage of the Rose rust, which it accompanies in 

 the autumn, and forms little blackish tufts on the under surface of the 

 on to the gradually disappearing uredo. 



The uredospores having already been described, we have to concern 

 ourselves with the teleutospores, as seen under the microscope. These 



very Long and cylindrical, terminated at the apex by a colourless 

 point, and the base continued into a long and swollen, almost bulbous, 

 translucent stem, which is longer than the teleutospore itself, and per- 



ni l\ adhering to it. The teleutospore (75-100 x 26-30 /.t) is of a clear 

 but dark brown colour, divided transversely by septa into from three to 



■ n cells, each of which is capable of germination, and the surface 

 minutely rough or waited. These teleutospores are usually collected in 

 little tu 



When germination takes place any one of the cells is capable of giving 

 off a short '_ r < rm tube, or promycelium, which becomes divided in the 

 uppc r portion into several cells, each of which gives off a short process, 

 which carries a small promycelial sporule. These promycelial sporules 

 are clnnged with the destinies of dissemination, and are the medium 

 through which other leaves are infected. 



Thearea of distribution of the brand is accepted as the same as that 

 of the uredo. of which the teleutospores are the recognised resting 

 spon 



ay with potassium sulphide and bum all fallen infected leaves. 



Sacc. Syll. vii. 2622; Mass. PI. Bis. p. 2G0 ; Cooke M. F. 201; 

 . Brit, I | . 225 ; W. G. S., Gard. Chron. duly 17, 1S8G, p. 76, 

 with figs.; Grevillea, iii. PI. 15, fig. 8. 



Rose Rot-mould. 

 I', ronospora sparsa (Berk.), PI. VI. fig. 52. 

 'I'h lould wi discovered in 1862 on a quantity of potted 



in a con ervatory. Fortunately it has not become an 

 and we doubt if it may not be almost extinct, although 

 in nil case revival and r< establishment are always possible. 



Irregular, pale brownish, discoloured apots appeared on the upper 



of the 1( these i ^tended rapidly, and in a short time the 



withered and shrivelled up, and ultimately the whole plant 



d. 



A delii b mould on the spots was scattered over the under 



surface of the leav< . The threads which arise from the mycelium 



ttered, omewhat torulose, and divided in the upper portion as 



much • ' or nine time in a forked manner, the anal brancblets 



beii rcelj hooked, bearing al their tips the elliptical conidia 



(20-22x16 l- 



