38 FUNGI. 
as species of Lecythea. In Cystopus, the spores are sub-globose, 
or somewhat angular, generated in a moniliform manner, and 
afterwards separating at the joints. The upper spore is always 
the oldest, continuous production of spores going on for some 
time at the base of the chain. Under favourable 
conditions of moisture, each of these spores, or 
conidia, as De Bary terms them, is capable of 
producing within itself a number of zoospores; * 
these ultimately burst the vesicle, move about by 
the aid of vibratile cilia, and at last settle down 
to germinate. Besides these, other reproductive 
bodies are generated upon the mycelium, within 
the tissues of the plant, in the form of globose 
oogonia, or resting spores, which, when mature, 
also enclose great numbers of zoospores. Similar 
oogonia are produced amongst the Mucedines in 
the genus Peronospora, to which De Bary con- 
siders Cystopus to be closely allied. At all events, 
Fic, 19.—Cystopus this is a peculiarity of structure and development 
feet rob wis yet met with in any other of the Ceomacei. 
In Uromyces is the nearest approach to the Puceiniet; in fact, 
it is Puccinia reduced to a single cell. The form of spore is 
usually more angular and irregular than in Zrichobasis, and the 
pedicel is permanent. It may be remarked here, that of the 
foregoing genera, many of the species are not autonomous that 
have hitherto been included amongst them. This is especially 
true of Lecythea, Trichobasis, and, as it now appears. of 
Uromyces.t 
Puccinta1.—This group differs from the foregoing chiefly in 
having septate spores. The pustules, or sori, break through 
the cuticle in a similar manner, and here also no true peridium 
is present. In Xenodochus, the highest development of joints 
is reached, each spore being composed of an indefinite number, 
from ten to twenty cells. With it is associated an unicellular 
* De Bary, ‘‘Champignons Parasites,” in ‘‘ Ann. des Sci. Nat.” 4m sér, vol. xx, 
+ Tulasne, ‘‘ Mémoire sur les Urédinées, &.,” in‘‘ Ann. des Sci. Nat.” (1854), 
vol, ii. p. 78. 
