138 
euphorbie sylvatice, D.C., in which true puccinoid germination appears to have 
taken place.t 
Fig. 21 shows a spore of Puccinia epilobii in which both modes of germination 
have taken place, the two narrow tubes being the commencement of uredinoid 
mycelium, whilst the wider tube is the beginning of a puccinoid germination tube. 
In observing the process of germination in various d/cidia, numerous minute 
spherical hyaline spores were encountered, that at first were supposed to be those 
of some stray mucedine. But that these bodies were connected in some way with 
the Acidium seems distinctly shown from the fact that they were found in Ac. 
berberidis, urtice, tussilaginis and crassum, immediately after the specimens had 
been gathered, and moreover in specimens that were collected of each of these 
species at various times, in habitats miles apart. They were furthermore not 
seen accompanying the spores of any other Uredine. These minute bodies were 
nearly globular or sometimes slightly ovate, measuring from two to three micromills 
across, and were often clustered around the dcidiwm spores apparently adhering 
to them (fig. 2). 
Another circumstance is worthy of record in connection with the germination 
of these fungi, viz., the occasional presence of an oval, cylindrical, uniseptate 
pale yellow spore, intercalated in the mycelial tube given off by certain species. 
This was observed in AMcidiwm berberidis, and tussilaginis, Puccinia malvace- 
arum, and Epilobii, and in the Uredo of Uromyces appendiculata and of Coleo- 
sporiwm tussilaginis. These spores varied in size from 15 to 20 mk. in length, to 
5 to 10 mk. in width; they were nearly hyaline, with a pale yellow tinge, uniseptate, 
with rounded ends, in fact very like miniature Puccinia spores. What their 
precise nature is it is not intended to affirm, but it would be interesting to hear 
if they have been encountered by other botanists who have studied the germina- 
tion of the Uredines. The only suggestion which presents itself to my mind is 
that they may be abortive attempts at fructification on the part of a mycelium 
grown under abnormal conditions, which attempts have assumed a form similar 
in contour with the most permanent spore as we commonly meet with it (figs. 22, 
23, and 24). 
The following are the species of Uredines which were made the subject of 
study :— 
Uredo of Phragmidiwm mucronatum, Link. 
ss Puccinia graminis, Pers. 
zs » Epilobit, D.C. 
5 ee Arundinacea, Hedw. 
m4 nA striola, Link. 
3 Uromyces appendiculata, Lev. 
a Coleosporiwm tussilaginis, Lev. 
a5 * Sonchi, Tul. 
= os Senecionis, Schum, 
+ Tulasne loc. cit. plate 9, f. 24 to 33. Cooke and Berkeley. Fungi; their Nature and 
Uses, p. 142, f. 81. 
