54 BOTANICAL GAZETTE 
later destroyed. In other cases, however, and usually wil 
twenty-four hours after settling down permanently, a sl 
growing smaller, being used apparently for the developm 
the rhizoid. This becomes somewhat club-shaped and 
develops from the swollen tip short branches which eventu 
(figs. Z6-18). By means of this rhizoid the young sporangit 
as it may now be called, gains nourishment and soon begins 
increase in size, so that by the end of the first day after 
penetration it may have grown to twice its former diamé 
The chlorophyll grains of the host, which normally are dist 
uted rather evenly over the cell wall, are now seen to be cong 
gating in the vicinity of the rhizoid, so that very often all | 
_ them are eventually clustered there (fig. 4). Sooner or lat 
_ the young sporangium ceases to swell uniformly and becot 
_ constricted at places, so that it develops a number of fo 
end or side of the sporangi 
