NOTKS ON MYCKtOZOA 88 



with the granuhir substance such as are found in P. cowjloineratiun 

 but rarely iu P. contextwn; the spores measure 11 /x, and are of 

 typical colour and roughness. 



Physarum Dideema Eost. Mr. J. Jackol has sent me a specimen 

 of this species from the State of Washington ; it is the first time we 

 have seen an example of it from the United States. The sporangia 

 are long plasmodiocarps, and the outer calcareous layer of the 

 sporangium-wall is in several parts refiexed from the persistent 

 membranous inner layer, a feature which is one of the distinctive 

 characters of the species. The gathering corresponds in all respects 

 with the English type. 



Physarum Crateriachea List. An account of a large gathering 

 of this species at Wardour Castle in August, 1895, was given in this 

 Journal for 1895, p. 823, where reasons were advanced for sup- 

 pressing the generic name Crateriachea given by Rostafinski, and 

 placing the species in the genus Physarum. Since the date of that 

 notice P. Crateriachea has twice been found in the neighbourhood of 

 Luton ; Mr. Saunders gathered it on straw in a plantation at Chaul 

 End in September, 1899, and again in July, 1900. On both oc- 

 casions there was a plentiful crop of precisely the same form as that 

 obtained at Wardour Castle. In December, 1899, I received from 

 Mr. R. E. Fries, of Upsala, specimens of a gathering he had made 

 at Frostviken, Jamtland, Sweden; they corresponded essentially 

 with our English examples and with the type in the Strassburg 

 collection. The sporangia were scattered, some nearly sessile, 

 others on short or longer stalks ; the stalks did not contain lime, 

 except where the apex expanded into the large conical or ovoid- 

 oblong columella, which was densely charged with white lime- 

 granules. The capillitium in the outer part consisted of delicate 

 anastomosing colourless threads, with scattered small white lime- 

 knots ; near the columella the threads were coarser, and contained 

 numerous brown membranous expansions such as we see in im- 

 perfect developments of other species of Physarum ; the spores 

 averaged about 8 // diam., intermixed with others of abnormal size. 

 The points in which the Swedish specimen differed from the former 

 gatherings were the more globose sporangia and the character of the 

 sporangium-wall, which was almost entirely destitute of lime, and 

 often iridescent. The columella was sometimes replaced by scattered 

 lime-knots, but this feature occurs in the English specimens. 



Physarum Gulielm^ Penzig. In Oct. 1899, I received from 

 Dr. Ph. Trilling, of Berlin, a specimen gathered by him near Kiel, 

 which we place under this name. It corresponds with that sent by 

 Mr. R. E. Fries from Upsala, previously described (Journ. Bot. 

 1899, 117). It is allied to P. rirescens Ditm., but appears to be 

 specifically distinct, notably in the white lime-knots of the capil- 

 litium. With the exception of Prof. Penzig's type from Java, we 

 know of no other record of its occurrence. 



Physarum didermoides Rost. var. lividum List. During the 

 years 1899 and 1900 Mr. Saunders has repeatedly found this 



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