44 THE MYCETOZOA:
T. contorta Rost.—Not nearly so frequent as the preceding,
but abundant in some years from autumn to spring on fallen
poplar logs near Leytonstone ; the var. inconspicua Lister
is the more perfect form of the species and is equally abundant.
T. decipiens (Pers.) Macbr. Frequent on logs and stumps
from early autumn to spring.
T. Botrytis Pers.—Abundant on dead wood from late summer
to spring ; var. flavicoma Lister, a minute form with bright
yellow spores and elaters, occurring on dead holly leaves, has
been found several times in the Loughton forest ; var munda
Lister, a larger form with elaters marked with very regular
neat spirals, has been met with in some abundance on dead
oak and hornbeam leaves in autumn ; var. cerifera G. Lister
(Journ. Bot., liii., 211) is perhaps hardly more than a phase of
typical T. Botrytis ; it has the sporangium-wall spotted with
sulphur coloured deposits of wax; the form is widely dis-
tributed and has been found several times in the Forest.
Hemitrichia Vesparium (Batsch) Macbr.—This species, which
is frequent in Bedfordshire woods from late summer to early
spring, is rare with us. It has occurred on mossy stumps in
Wanstead Park.
H. leiotricha Lister.—Uncommon ; it was fairly abundant
in the Forest and Wanstead Park in November and December
1896, on dead bramble, oak and hornbeam leaves ; but has
not been found there since.
Arcyria ferruginea Saut.—Frequent on decaying logs in
autumn and winter, often covering large areas with its fragile
brick-red sporangia; var. Heterotrichia Torrend, a form with
many free ends to the capillitium, has been met with in a
Leytonstone garden after cold weather.
A. cinerea (Bull.) Pers.—Common on sticks and stumps
from summer to late autumn ; scattered sporangia are often
found on heaps of dead holly leaves throughout the winter ;
var. carnea Lister, a form with neat flesh-coloured sporangia,
has occurred in Wanstead Park on dead wood.
A. pomiformis (Leers) Rost.—In some years this species is
abundant on logs and fallen oak wood lying among grass,
from summer to autumn ; it may be distinguished in the field
from A. cinerea by its scattered habit and by the lax capillitium
of the round yellow sporangia.