24 IOWA ACADEMY OF SCIENCES. 



Such conditions would not seem specially favorable for 

 organisms so sensitive and quickly responsive as are the slime- 

 moulds. One region is during the warm season too dry; 

 another where moisture is adequate would seem too cold. 

 Nevertheless, I found Myxomycetes, in one stage or another, 

 in every region visited. The only one characteristic which 

 seemed to indicate unfavorable conditions was the scanty size 

 of the fructifications, although there were exceptions even to 

 this. However, on the whole, my specimens are poor and 

 show nothing like the beauty and perfection of the same spe- 

 cies as collected in the woods of eastern Iowa. Further anno- 

 tation is more conveniently made in connection with the names 

 of each particular species. 



There is no attempt to revise the nomenclature which here 

 in general follows the usage of American authors. 



1. Bartramia utricularis Berkeley. 



Only one gathering of old and weathered material near Hot 

 Springs. 



2. Physarum cinereum Pers. 



Abundant on the buffalo grass (Bouteloua) in several jDlaces 

 near Minnekahta. Found also on dried, weathered droppings 

 of cattle and horses near Long Pine, Neb. This appears 

 to be a ubiquitous species. Although not especially common, 

 yet it appears in all sorts of places and is usually profuse in 

 fructification. 



3. Physarum nefroideum Rost. 



Represented in this collection by a single gathering of small 

 scattered stipitate sporangia. Collected at Custer. 



4. Cratereum aureum (Schum. ) Rost. 



Once collected along Fall River near Hot Springs. The 

 sporangia are immaturely dried up, but I believe correctly 

 identified. 



5. Tilmadoche nutans (Pers.) Rost. 



A small colony of weathered sporangia from the neighbor- 

 hood of Hot Springs. 



6. Spumaria alba (Bull.) D. C. 



The specimen is immature and small. It was collected as a 

 milk-white Plasmodium and passed into the fruiting phase in 

 the collecting case. 



7. Didymiurn crufitaceum (Fr.) Rost. 



One gathering, in fairly good condition. The species is 

 quoted by Lister as from Poland and England and appears to 



