650 Fritsch . — Two Fungi , parasitic 
the parasitic mycelium presents a moniliform appearance. The 
mycelium, although as a rule simple, is occasionally somewhat 
branched ; and by means of such branches, emerging from 
the algal threads into the surrounding medium, infection 
from one filament to another readily takes place \ Occasionally 
uniciliate zoospores of relatively large size and moving actively 
are produced ; these ultimately come to rest on the Alga and 
germinate immediately. According to Dangeard’s view, a 
sexual process also takes place, leading to the formation of 
thick-walled zygospores, which are generally spherical but 
sometimes elongate-elliptical in shape, and which are often 
formed in considerable numbers in the same algal filament 
The germination of these zygospores was not observed. 
I have observed a species, which is probably identical with 
the Resticularia nodosa of Dangeard, although differing in 
a number of points from the author’s original description. 
Further, a new species from the Pen Ponds, Richmond Park, 
will be described, which I have great pleasure in naming 
after its collector, Mr. L. A. Boodle, F.L.S. 
1. Resticularia nodosa, Dangeard (?). 
This Fungus was first observed in a species of Tolypothrix , 
growing on rocks in the Nepenthes - house at Kew, in October of 
last year. At this time many of the filaments of the Alga 
were infested by the parasite (Figs. 19-23). The latter formed 
long chains of cells within its host, each link of the chain 
generally occupying one of the algal cells. The successive 
cells in the chain were separated from one another by true 
transverse walls, which seem, however, to arise after the con- 
striction of the fungal hypha has taken place. The shape 
of the cells of the parasite is very varied, and it appears more 
or less to adapt itself to the size of the surrounding algal cell. 
Usually each segment of the Fungus has an elongated elliptical 
outline (Figs. 19-21), frequently with one or both ends con- 
siderably dilated ; the cells may, however, also be oval or 
1 Dangeard does not figure any such infection. 
