LISTER I THE STUDY OF MYCETOZOA IN BRITAIN. 233 
A. denudata (L.) Sheldon.—Very abundant and conspicuous 
from the crimson colour of the sporangia on decaying stumps 
and logs, from summer and on into winter in mild seasons. 
A. incarnala Pers.—Fairly common from summer to winter 
on dead stumps and fallen wood, especially of oak ; var. fulgens 
Lister, a brilliant carmine-red form, has been found several 
times in the Forest. 
A. nutans (Bull.) Grev.—Abundant on dead wood, especially 
of oak, from summer to autumn. 
A. Oerstedtii Rost.—Our only Essex record of this widely 
distributed and handsome red species is a fine growth on dead 
wood obtained by Mr. Ross in the Chingford Forest in August 
1916 ; when first found it was immature, but, after being brought 
indoors and kept moist for some days, it developed perfectly. 
It appears from summer to winter in favourable weather. 
Lachnobolus congestus (Somm.) Lister.—This inconspicuous 
species has been obtained twice on bark and dead wood in the 
Forest, in late autumn. 
Pcrichaena depressa Libert.—Not common ; it appears 
between the bark and wood of hornbeam logs, and in some years 
has developed in great abundance in summer, autumn and 
winter ; it has once been found on dead holly leaves, asso¬ 
ciated with Trichia Botrytis var. flavicoma. 
P. corticalis (Batsch) Rost.—Abundant in the crevices of 
the bark of poplar and hornbeam from summer to winter, es¬ 
pecially in the Avenues, Leytonstone, and Wanstead Park. 
The sporangia vary much in size and colour and may be white, 
grey, nut-brown, red-brown or brownish-purple. It is often 
found associated with Trichia contorta, the sporangia of which 
are hardly distinguishable in the field from the brown form 
of P. corticalis. 
Margarita metallica (Berk. & Br.) Lister.—Not common ; 
the scattered pearl-like sporangia occur on decayed leaves 
ot holly and rhododendron, usually in the winter months ; the 
form with clustered sporangia developing on wood has not yet 
been recorded from Essex. 
[Since this List was drawn up, three more species of 
Mycetozoa, another variety, and another form of a species have 
been recorded for Essex : they are Diderma deplanatum Fries, 
o 
