14 Transactions British Mycological Society. 
clippings etc. began to bear a rich harvest of Mycetozoa of 
many species. Physarum pusillum and Comatricha tenerrima 
appeared together in some quantity on decaying stems of 
Oenanthe crocata in a very wet copse. Didymium Clavus studded 
old gorse twigs with hundreds of grey nail-like sporangia, even 
exceeding the goblets of Craterium munutum in their profusion. 
The bare and wind-swept valley known as Smallacombe has 
proved to be the habitat of a number of interesting species; 
its steep sides have been denuded of all trees for several years 
and the only shelter is afforded by heather, mountain fern and 
small whortleberry bushes. The lowest slope is always moist 
and covered with a rich growth of mosses down to the path-side, 
amongst which nestle the dainty ivy-leafed Campanula, bog 
pimpernel and Cornish moneywort. Facing north-west, it is a 
cold and draughty combe even in summer since the winds 
either sweep up it from the sea or blow down it directly from 
the Exmoor plateau. On October 23rd I noticed a fine develop- 
ment of the sessile sporangia of Diderma ochraceum on wet moss 
at the foot of the combe and a hurried search soon revealed 
‘many more large growths of this very uncommon species, some- 
times sheltering under heather but more often fully exposed 
on the moss. Fresh developments were in all stages of growth 
from the lemon-yellow plasmodium to ochraceous ripe sporangia ; 
the following week they were still appearing but now acconi- 
panied by masses of orange plasmodium developing into the 
inconspicuous though sturdy sporangia of Lepidoderma tigrinum. 
As these two species have frequently been found in association 
(rossibly there may be some connection between them not as 
yet understood) it was particularly interesting to be able to 
study their growth side by side; the lemon plasmodium always 
produced the sessile ochraceous sporangia and the orange plas- 
modium as constantly developed into stout stalked deep olive 
sporangia with the characteristic white crystalline discs. Al- 
though the moss was teeming with plasmodia I never found the 
lemon and orange veins touch one another or mature upon the 
same stem. Associated with the Diderma and Lepidoderma 
were a number of small short-stalked sporangia of Lamproderma 
columbinum very closely resembling L. violaceum in habit and 
quite different in appearance to the handsome long-stalked large 
sporangia of typical L. columbinum which had appeared in a 
three-inch wide mass on short moss near by. This is the usual 
form in the Porlock district and is not infrequent in winter on 
bare soil by wet woodland tracks. It is interesting to note that 
whereas Lepidoderma tigrinum is usually only found on wet 
moss or very rotten wood I have recently seen it in fine con- 
dition on Polytrichum growing on a stony slope in CulboneWood 
