94 Magnus. — On some Species of 
the same manner as in U. Kriegeriana. In this species there 
are also certain hyphae which produce only male cells, and often 
branch from these cells (Figs. 24, 28-30). It is remarkable, as 
I have observed, that the male cells are sometimes divided by 
septa (Figs. 32, 33). They conjugate by means of a narrow 
connecting channel through which the protoplasm of the male 
cell passes into the female (Figs. 24, 28, 29). The conjugating 
cells are alike, or differ only slightly in size at first (Figs. 28 
and 32) ; but the receiving-cell soon enlarges considerably 
and separates from the mother-thread, the remains of which 
are only seldom perceptible (Figs. 29 and 33 r) Thus it 
would appear that conjugation always takes place on the 
side opposite the stalk. This conjugating side remains also 
flattened and usually somewhat depressed in the centre, as 
the authors quoted above have described and figured, and 
eventually a strong brown membrane is formed. No swarm- 
sporangia are known : it is, however, quite possible that they 
exist, as so far only the cysts of the inner tissue of old galls 
have been examined, not the surface of young galls. The 
specimen I examined did not show any zoosporangia. 
The case is very different in Urophlyctis pulposa , the 
development of which has already been described by Schroeter 
in its more essential features. The parenchymatous cells 
infected by the parasite enlarge considerably, but at the 
same time the wall is perforated, owing to the action of the 
parasite, by local gelatinization, whereby their protoplasm, 
together with- that of the parasite living in it, passes into 
the surrounding cells (Figs. 14-16), causing in this case also 
considerable enlargement (Fig. 14). Thus the parasite wanders 
through the perforations of the wall caused by local gelatiniza- 
tion of the membrane from one cell to another, and all the 
infected parenchymatous cells of an infected area represent 
a continuous system of cavities pervaded by the parasite, and 
often intermixed with unchanged small parenchymatous cells 
(Fig. 14). 
Schroeter, in Engler and Prantl, Natiirl. Pflanz., I. Theil, 
1. AbtheiL, p. 86, also refers his Physoderma Butomi to the 
