230 LISTER : THE STUDY OF MYCETOZOA IN BRITAIN. 
spring, and always very attractive from its brilliantly iridescent 
sporangia. 
L. violaceum (Fries) Rost.—Not common ; on sticks, dead 
leaves and mossy stumps, appearing chiefly in autumn and 
winter. 
L. arcyrionema Rost.—A widely distributed species, but 
only once recorded from Essex ; a small growth of the silvery 
sporangia was found on a hornbeam stump in Gilbert Slade in 
July 1892. 
Amaurochaete fuliginosa (Sow.) Macbr.—This species appears 
at all times of the year, and only on coniferous wood. Typical 
black aethalia developed on a log of Scots pine in June 1909, 
in a garden at Leytonstone. 
Brefeldia maxima (Fries) Rost.—Not common ; between the 
years 1887 and 1896 this species continued to appear on certain 
stumps in Wanstead Park in autumn and winter, the aethalia 
forming conspicuous dark brown cushions four to eight inches 
across ; it has not since been recorded from Essex. 12 
Cribraria argillacea Pers.—Not common ; it appeared in 
July 1888 and 1894 on a Spanish chestnut stump in Wanstead 
Park, and has developed several times on logs of Scots pine in a 
Leytonstone garden. Like most species of the genus, 
C. argillacea usually occurs on coniferous wood, and in the 
summer months. 
C. aurantiaca Schrad.—Not common in this district ; for 
several years it occurred on the same chestnut and pine wood 
as the preceding species in August and September ; Mr. Ross' 
also obtained it near Chingford, August 1916. Two forms have 
been observed, viz., one with ochraceous spores and large or 
small flat nodes to the sporangial net, the other with golden 
yellow spores and usually dark rounded convex nodes to the net. 
C. ruja (Roth.) Rost.—One record only of this species is 
known for Essex. It was found on decayed wood of a pollard 
oak, about five feet from the ground, in Lords Bushes, Buckhurst 
Hill, October 1915. This is the one instance I know of the 
sporangia occurring on any but coniferous wood ; they are 
weakly developed, the net enclosing the upper part of the 
* 
sporangium, instead of consisting of narrow firm threads, as in 
typical specimens, is represented by membranous extensions 
12 A large growth has again appeared in Wanstead Park in the summer of 1917. 
