The Myxomycetes of Eastern Iowa. 125 



very short - stalked, leather-yellow or ochraceous in color. 

 Capillitium nodulose at the intersections of the threads which 

 are rough with minute papilla or short spines but no rings. 

 The peridial cup shows a margin with petaloid lobes. Too 

 near the ochraceous forms of the preceding species. 



16. Arcyria nutans, BuUiard. Plate II, Figs. 6, 6a and 6b. 



Sporangia crowded, elongate, short stipitate or sessile by 

 an acute base. Spores and capillitium -mass, pale straw- 

 colored, or 3'ellow. Capillitium lax, very long fiexuous, erect- 

 nodding, at length decumbent; capillitium threads adorned 

 with distinct irregular spinules. 



This elegant species is not rare in undisturbed woods 

 especially on fallen willows. The expanded capillitia are very 

 soft and plume-like, waving and nodding, ver}^ lightly attached 

 below to the center of the peridial cup. The capillitium 

 threads are rough with irregular spines and sharp - edged 

 transverse plates, occasionally extending to form rings. Re- 

 sembles the next except in color. Spores smooth, .0084-. 009. 

 Autumn. 



17. Arcyria cerstedtii, Rostajinski. 



Sporangia ovoid, in typical forms stipitate with short stipe; 

 capillitium and spores nut - brown or fuscous ; capillitium 

 threads cylindric with not infrequent vesiculose expansions, 

 abundantly and uniformly spinulose. Spores smooth, .008- 

 .009. 



A very handsome species; in size and external appearance, 

 save color, much resembling A, nutans. The capillitium 

 threads are however decidedly different, being uniformly 

 spinulose with rather long aculeate spinules. The vesiculose 

 thickenings occur rarely. Found on prostrate trunks, logs, 

 in marshy places. July — September. Decorah. Mr. Holway. 



