LIST OF SPECIES RECORDED FROM ESSEX. 45
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. incarnata 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.
Perichaena 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
of 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,