LISTER ! THE STUDY OF MYCETOZOA IN BRITAIN. 223 
Ceratiomyxa fruticulosa (Muell.) Macbride.—Abundant on 
decayed wood of logs and stumps ; appearing from June 
to September, and, rarely, in October. 
Badhamia populina Lister.—This species was first tound 
on a wood pile at Walthamstow by Miss Jessie Lloyd in June 
1899. In November 1902, it appeared in showy white masses 
that could be seen yards away on the under side of fallen poplars 
in the Avenues, Levtonstone. Since then, we have found 
it most years, usually in autumn and winter, in Wanstead 
Park and in the surrounding district where poplars have fallen. 
Several developments may succeed each other for a few weeks, 
but there appears to be only one main crop a year. It is an 
abundant species in Colorado, where it occurs on the bark of 
poplar and Acer Negundo. 
B. utricularis (Bull.) Berk.—Common in Epping Forest 
on old logs of oak and hornbeam, appearing throughout the 
year when the seasons are moist, but especially abundant 
from autumn to spring. The plasmodium subsists on leathery 
fungi, and, in seasons that are unfavourable to these fungi, B . 
utricularis will be scarce. When developed under unfavourable 
conditions, the fructification, instead of forming the usual 
grape-like clusters of sporangia, has been found to extend 
in a flattened network of veinlike plasmodiocarps. 
B. foliicola Lister.—First identified as a distinct species 
in September 1896, when it occurred in vast abundance in 
Wanstead Park on half-dead turf under elm trees and on heaps 
of dead sycamore, elm, and bramble leaves, and also on twigs. 
It usually reappears there every autumn. It has been recorded 
now from nine English counties, as well as from Scotland* 
France, Germany, Switzerland, and Portugal. It is closely 
allied to B. utricularis, differing in having free, not clustered 
spores, and in feeding on dead leaves and not on leathery fungi. 
It has made its appearance every month from June to January. 
B. panicea (Fries) Rost.—This variable species is fairly 
abundant from summer to winter on the bark of fallen trees, 
especially of elms and poplar. The white or grey sporangia 
vary much in size. They are usually sessile and clustered on a 
red-brown membranous hypothallus, but sometimes we meet 
with scattered sporangia having short dark red stalks. 
B. macrocarpa (Ces.) Rost.—Not common. It has been 
