Biology of the Uredinee. : 455 
Germination in the same species will vary greatly, 
g to the conditions. Fig.8, pl. Xxxvi, shows the 
‘J fogress that various spores have made at the end of four 
tours. On January 25, 1892, uredospores of Puccinia Rubigo- 
wa, taken from outdoor plants, germinated in ¢wo hours in 
) vam water, producing germ tubes 50m long. In this case 
) mination could actually be seen going on. The germ pores 
) gan swelling almost immediately on being placed in the 
Water. 
ie 3. A new method of producing sporidiola. 
In the course of my experiments with the germination of 
sea very much narrowed at the point of attachment. 
these are well illustrated in pl. XXXVIII, fig. 15 and pl. XXXIX, 
j along the promycelium, or they may be almost in 
JSsters, originating from points rather close together. The 
7 Mcess that I shall describe is very different, and is as fol- 
Tn yt first the promycelium presents the ordinary appear- 
nt disposition in the ter- 
ke oh acrogenous abjunction. A 
a. uced in succession from the same prom 
4 ‘the those Nearest the end are the oldest, an 
Bee OCesS Of separation while those farthest bac 
m 
Stning to for 
1 We 
his term, in preference to “‘sporidia,’ : 
‘Tse t 
| | grt: 
dere die Kryptogamisten, 
II.—No. 12, 
