LISTER ! THE HAUNTS OE THE MYCETOZOA. 
305 
exposed to weather on the slopes of Hind Head, have been found 
scattered sporangia of Enerthenema papillatum and small growths 
of Arcyria pomiformis and Hemitrichia abietina.. The two former 
were also abundant on the fallen boughs lying amongst the 
wet grass beneath. In Epping Forest, we have repeatedly 
found Colloderma oculatum on living trunks of old pollard oaks, 
especially where a trickle of water from the crown of the tree 
kept a crevice of bark moist for weeks together ; here crop 
after crop of sporangia has appeared. In Epping Forest, 
too, Enerthenema has been found amongst moss on living oaks. 
On decaying oak wood, amongst the many Mycetozoa that 
thrive, may be mentioned Badhamia capsulifera, B. nitens, and 
Diderma floriforme, whose sporangia open like flowers with 
petal-like lobes. 
On heaps of Spent Tan, where broken up oak bark is satur¬ 
ated with animal matter from tanning hides, the bright yellow 
aethalia of Fuligo septica blossom forth so suddenly and so fre¬ 
quently that they have received the popular name of “ Flowers of 
Tan.” Beside this showy and extremely common species, careful 
search may also detect in such a habitat the minute yellow 
sporangia of Cornuvia Serpula, only known from tan heaps, and 
probably considered rare because we do not frequent tan-yards 
enough. The only British gathering of Cornuvia was made 
by Mr. M. J. Coon, who found it in some abundance near St. 
Austell, in Cornwall, on tan, from which he also obtained 
Oligonema nitens. 
Half-submerged Logs.—A special habitat is to be found 
in logs of oak and birch (and probably of other trees) lying on 
the marshy borders of woodland pools. These logs, which are 
liable to partial submergence in wet weather, afford a 
characteristic haunt, at least in England, for the two species 
of Oligonema , 0. nitens and 0. ftavidum. It is a welcome ex¬ 
perience, on turning over some dead bough lying on black soil 
which was once the bottom of a pond, to have the shining clusters 
of these minute sporangia meet one’s gaze. Trichia persimilis, 
a common species elsewhere, is also often found on half-sub¬ 
merged wood. 
Hornbeam logs are favourable for the growth of many abund¬ 
ant species, such as Stemonitis fusca, Enteridium olivaceum, 
several species of Trichia , Perichaena populina and P. depressa. 
