332 



Mycologia 



sented in America only by Harvey's original gathering from 

 Orono, Maine. It is therefore satisfactory to be able to record 

 another locality. In August, 1913, it was collected in small 

 quantity in the Wet Mountain Valley, Colorado. The gathering 

 corresponds in every particular with the original description. 



Dianema corticatum List. A small gathering of this in- 

 teresting species was made at Lake Eldora, Colorado, in August, 

 191 5. The salmon-pink plasmodium occurred on coniferous 

 wood and was seen to mature into subglobose or elongated, 

 crowded sporangia, often longitudinally wrinkled and of a reddish- 

 brown or chestnut color. The capillitial threads are scanty, deli- 

 cate, straight, rarely branching, often thickened longitudinally 

 or in a bead-like manner, rarely showing traces of spiral mark- 

 ings. The spores, usually united in clusters of 2-5, are, in the 

 mass, precisely the color of those of Lycogala epidendrum. This 

 is the first record of this species in the United States, Miss 

 Lister writes me that it was collected by Professor J. W. Eastham 

 near Quebec in September, 191 3. In gross appearance and in 

 the character of the sporangium- wall, Dianema corticatum recalls 

 the genus Perichaena. The clustered, yellow spores are similar 

 to those of Enteridium. The capillitium exhibits the features 

 of both Prototrichia and Dianema. As Miss Lister points out, 

 it is undoubtedly a transition form connecting the two latter 

 genera. 



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Explanation of Plates 

 Plate 14 



Fig. 1. Physarum melanospermum. Habit. X 15. 

 Fig. 2. The same. Capillitium and spores. X 450. 

 Fig. 3. The same. Spores. X 960. 

 Fig. 4. Didymium fulvum. Habit. X 15. 



Fig. 5. The same. Portion of sporangium-wall, with capillitium and 

 spores. X 450. 



Fig. 6. The same. Spores. X 960. 



Plate 15 



Fig. 1. Enteridium minutum. Habit. X 15. 



Fig. 2. The same. Portions of interior of aethalia showing varied struc- 

 ture of component sporangium-walls. X 450. 

 Fig. 3. The same. Spores. X 450. 

 Fig. 4. The same. Spores. X 960. 



