JOUENAL 



OF THE 



PtOYAL MICKOSCOPICAL SOCIETY. 



JUNE, 1917. 



TEANSACTIONS OF THE SOCIETY. 



III. — Notes u^jon Physarum carneum G. Lister and Sturgis : 

 A New British Species of Mi/cctozoa. 



By Henry J. Howard, F.E.M.S. 



{Bead April 18, 1917.) 

 Plate XVIII. 



On July 16, 1916, while searching for Mycetozoa in the grounds 

 attached to Household House, Norwich, a gathering was made of 

 what appeared to me to be an unknown species. 



The following note was made on the spot : " On old bramble 

 stems a fairly large gathering of stout, stalked, reddish-brown 

 sporangia, not quite mature, but which dried during the morning 

 to pale orange-buff sporangia, with lime-granules in the sporangium- 

 wall clearly visible under a pocket lens." Four days later, the 

 same species was found on dead bramble and bracken stems ; a 

 visit on July 29 failed to yield further specimens. 



I was unable to forward a specimen to Miss Lister for her 



EXPLANATION OF PLATE XVIII. 



Physarum carneum G. Lister and Sturgis. 



A. Colorado. Type from Professor Sturgis (September 10, 1908). 

 B-C. Thorpe, Norfolk. H. J. Howard (July 15, 191G). B is a typical form, 

 while C is an almost limeless form. 



D. Showing fragment of sporangium- wall with slender capillitium showing 



smaller lime-knots and abundant connecting threads. 



E. Coarser, almost Badhamia-VikQ capillitium. 



F. Spinulose purple-brown spores, 8-9 /u. 



G. Fragment of sporangium-wall. 



G. Lister, del. 



June 20th, 1917 T 



