126 
MYCETOZOA OBSERVED IN EPPING FOREST 
IN THE AUTUMN OF 1912. 
By Miss Gulielma Lister, F.L.S. 
[At the “ Fungus Forays ” in October and November, Miss Lister 
kindly acted as Referee for the Mycetozoa, and furnished the following 
lists of the species gathered.—E d.] 
/. —Ramble between Loughton and Theydon on igth Octobev 1912 . - 
Badhamia utricularis Berkeley : found in the plasmodium stage,, 
creeping on Irpex on a fallen branch, and in mature sporangia. 
Physarum nutans Persoon: Several forms of this variable species w'ere 
found, viz., the typical form with nodding lenticular sporangia on slender 
dark stalks ; the subspecies leucophaeum, with sporangia either sessile or 
on short dark stalks ; and the remarkable var. robustum of this subspecies, 
a form that occurs regularly in the autumn and winter both in Epping Forest 
and Wanstead Park. It is characterized by the large sporangia having 
an unusual amount of calcareous matter in the capillitium, in the stalks, 
and in the hypothallus. Sometimes the stalks are as white as in Physa¬ 
rum leucopus, but are frequently associated with others of the usual grey 
or drab colour. The capillitium is more robust than usual ; there are 
many flat membranous expansions at the angles of the branches, and the 
time-knots are often more or less concentrated to form a central mass or 
“ pseudo-columella.” A fine specimen of this variety was obtained by 
Mr. Ross near Chingford. 
Craterium mmutum Fries, (syn. C. pedunculatumT rentip) : on holly 
leaves. 
C. leucocephalum Ditmar : on holly leaves. 
Leocarpus fragilis Rost. (syn. L. vernicosus Link) : on holly leaves 
twigs, grass, etc. 
Didymium squamulosum Fries, (syn. D. effusum Link) : on holly leaves. 
D. nigripes Fries : on holly leaves. 
D. melanospermum Macbr. (syn. D. farinaceum Schrader) : on dead 
twigs. 
Stemonitis jusca Roth : on a poplar log. 
Comatricha nigra Schroeter (syn. C. obtusata Preuss) : on fallen boughs. 
Trichia varia Pers. : on dead stumps of oak and hornbeam. 
T. persimitis Karstin : on dead w r ood and leaves. 
Arcyvia ferruginea Sauter : on dead wood. Sporangia were found 
both in the pale pink young stage, and in the deep red mature condition ; 
the latter when dry became bright orange-red. 
A.incarnata Persoon: on dead oak twigs. 
A. denudata Sheldon (syn. A. punicea Persoon) : on hornbeam stumps. 
A. (inerea Pers. (syn. A. albida Pers.) : on twigs. 
II. Chingford, 7 .nd November 1912. 
The rains of the previous week, succeeding the long spell of dry weather, 
had been favourable for those species of Mycetozoa wdiose f ‘ plasmodium/’ 
or creeping and feeding stage, is passed within the substance of dead wood ; 
the prostrate logs, stumps, and fallen branches had probably never become 
quite dry, and the recent rains had encouraged the plasmodia to feed, 
and emerge into the open air to form their sporangia. But the thick 
