Transactions British Mycological Society. 



MYCETOZOA FOUND DURING THE SELBY 



FORAY. 



By Gulielma Lister, F.L.S. 



The visit of the British Mycological Society to Selby proved a 

 successful one for those of the party who were interested in 

 Mycetozoa. Owing to the Yorkshire Naturalists' Society 

 holding its meeting at Selby about the same time, although 

 starting a few days earlier, and combined expeditions being 

 taken, the number of days for collecting were more than usual, 

 and extended from Saturday, September 7th, to Friday, Sep- 

 tember 13th. 



Sufficient rain had fallen in the previous weeks to make the 

 woods and heaps of dead leaves thoroughly moist, and the 

 weather during the time of the foray was, on the whole, fair. 



Osgoodby Woods, Camblesforth Wood and Bishop's Wood 

 were visited before the main party arrived; and Mycetozoa 

 were collected under the able guidance of Mr. W. N. Cheesman. 



On Tuesday, September loth, Byram Park, with its fine 

 lawns, groups of living and felled beeches, as well as denser 

 woodland, was searched. Large developments of Dictydiae- 

 thalium plumbettm, both mature and in rose-red plasmodium, 

 were found on beech logs. On another prostrate beech, growths 

 of purple-brovrn sporangia of Didydium cancellatum were seen 

 extending interruptedly for a length of about twelve feet. 

 Another dead beech stump yielded a conspicuous cushion-like 

 mass of translucent white plasmodium an inch across, which, 

 on being carefully removed, developed in a few days into a 

 fine growth of Stouonitis fusca var. confluens — a completely 

 aethalioid forai without trace of stalks or columellae. In the 

 denser woodland, the rare Lycogala flavofuscum was found at 

 the foot of a tall elm, looking so much like a big grey puff-ball, 

 that it was mistaken for one by its finder and broken open. 

 The aethalium measured an inch across, and was produced at 

 the base on one side into a curious pale yellow stalk-like strand 

 of hypothallus. Under large hollies, deep beds of decaying 

 leaves afforded a favourable haunt for many Mycetozoa. 

 Here were found Craterimn aureum, C. minntum, Diderma 

 effusum, Didymiiini nigripcs, D. Clavus, D. squamulosum and 



