84 THE JOURNAL OF BOTANY 
With regard to Didymium Trochus, it is noteworthy that it has 
been found in increasing numbers each season since its original 
discovery in April, 1897. It was at first regarded as an abnormal 
form of isla — me Duby. Further observations, however, 
ulaseadt t it was really different from sig species, both to the 
naked fomge and a beneath the microsco Upon mature con- 
sideration it seems safe to assume that this species rg previously 
to 1897 in just such situations as those in which it is now seen, but, 
as these habitats had not been carefully searched, it had been 
overlooked. The plant is very retiring in its habit. Of the many 
thousands of sporangia which have come under my notice, none 
have been seen on the surface of the straw-heaps. When forming 
their — they always do so at or below the line of saturation, 
gether. This 
is found to be an chia: to lift up a thick layer of material, 
turn it upside down, when the sporangia, if present, rapidly dry, 
and thus become fairly conspicuous. They are, however, very 
disappointing when attempting to collect them, as their attach- 
ment to the straw is very slight, and numbers of them fall off in 
transit. In this respect they are widely different from those of 
Dd, Eli with which D. Trochus is often associated. 
o general is the habit with D. Trochus of fruiting below the 
aan where they are out of the reach of currents of air, that the 
question naturally arises as to how th ores are distributed. 
loughing 
for other agricultural purposes. The plasmodium of this species 18 
** butter-yellow,” and was first observed by Mr. C. Crouch at Kitchen 
nd, Beds; it has since been seen at Stopsley Common, in the 
same county. 
adhamia ovispora Racib. is another interesting denizen of 
straw-heaps, and has been observed in various places extending 
from Nether Crawley, two miles east of Luton, to Barton, Beds, 
in B i 
Farm. 
the sporangia at or above the line of saturation. Other species 
with a similar habit are Physarum compressum, P. Dy igh 
P. Crateriachea, Craterium pedunculatum, C. leucocepha alum 
pears Chondrioderma spumarioides, C. Michelii, Perichana 
varia 
Of species that are usually found at or near the surface of 
Straw-heaps may be enumerated Physarum calidris, P. didermoides, 
P, didermoides lividum, P. vernum, Fuligo septica, F, ellipso- 
spora, Didymium nigripes, Spumari ta alba. 
With iii tenes to the habitats of the whole of the Mycetozoa 
that have come under our observation in this district, fifty-five per 
cent. have been found on wood only; seven per cent. on leaves; 
six per cent. on straw; seven per cent, on all three materials; and 
