Mycologia 



standing an exceptionally dry summer, the specimen was badly 

 weathered, indicating that it is a typically spring species. It is, 

 however, perfectly characteristic in the membranous hypothallus 

 and stalk; persistent capillitium of fine, branching threads with 

 large, scattered, yellow lime-knots; and dark, spinulose spores, 

 10.5-11 fM in diameter. 



Craterium aureum (Schum.) Rost. This species is recorded 

 here merely as an addition to previously published lists of Colo- 

 rado Myxomycetes. It occurred in considerable abundance on 

 dead herbaceous refuse in the Wet Mountain Valley and on dead 

 twigs on Cheyenne Mountain in August, 1914. Both gatherings 

 are of the form with globose, golden-yellow sporangia, cartilagin- 

 ous below ; orange stalks rising from a membranous hypothallus ; 

 dense capillitium, the nearly white lime-knots often merging into 

 a central mass ; spores 8-9.5 A* m diameter. In this form it is 

 hardly distinguishable from Physarum citrineilum Pk. 



Craterium paraguayense (Speg.) List. Recorded hitherto 

 in the United States only from Louisiana (Craterium rubescens 

 Rex), this species occurs in fine condition in a large collection 

 of Myxomycetes made by Professor Thaxter in Florida in 1897. 

 The specimens were found on dead leaves at Palm Beach and 

 are typical in every respect. 



Diderma trevelyani (Grev.) Fries. The normal form of 

 this species is common in Colorado. In September, 191 5, a 

 plasmodiocarpic form was found in company with the normal 

 form on dead leaves on Cheyenne Mountain, Colorado. The 

 plasmodiocarps are of very variable form and size and of a uni- 

 form chocolate color without paler lines of dehiscence. In other 

 respects they are quite typical. 



Diderma rugosum (Rex) Macbr. Fine specimens of this 

 rather uncommon species were collected in Florida by Professor 

 Thaxter in 1897. It is typical in every respect, except that the 

 spores measure 11. 5-14.5 ju, in diameter, a fact of interest in view 

 of the close relationship of this species to D. radiatum. 



Diderma simplex (Schroet.) List. Miss Lister reports this 

 species from New Jersey (Monog. Mycet, p. 108) ; Mr. Hugo 

 Bilgram has collected it near Philadelphia. A very fine gather- 

 ing was made by Professor Thaxter at Cranberry, N. C, in 



