254 Mycetozoa of North America 



Sporangia crimson; stalks firm, dark reddish brown. 



Type locality: Germany. 



Habitat: On dead wood. 



Distribution: Common throughout the United States and 

 Canada but not abundant; *West Indies; var. fulgens, not so 

 common. 



Illustration: Lister, Mycetozoa ed. 3. pi. 177. 



This species is related to A. denudata and is distinguished 

 principally by the capillitium being almost free from the cup. 

 There are frequent intermediate forms in which the capillitium 

 is partially attached, and these must be separated by the other 

 characters, such as the more expanding capillitium, the shorter 

 stalk, and the more numerous free ends to the capillitium in A. 

 incarnata. Var. fulgens is a constant form and not rare. The 

 color of the capillitium and stalk is much darker than in the 

 typical form. 



10. Arcyria stipata (Schw.) Lister, Mycetozoa 189. 1894. 



Leangium stipatum Schw. Trans. Am. Phil. Soc. II. 4: 258. 1832. 

 Hemitrichia stipata (Schw.) Macbr. N. A. Slime-Moulds 204, 1899. 



Plasmodium? Total height 1 to 2 mm. Sporangia distinct 

 but clustered, on long stalks, cylindrical with well-defined cups, 

 copper-colored or deep brown; or, in vermiform masses of densely 

 compacted and superimposed, cylindrical, contorted sporangia, 

 with short stalks or nearly sessile, and poorly defined cups, reddish 

 brown; sporangia! wall irregularly evanescent above, persistent 

 as a plaited or smooth cup, papillose or faintly reticulate near the 

 rim. Stalk 0.1 to 1.5 mm. high, red-brown, dark brown, or nearly 

 black, filled with spore-like cells. Capillitium a more or less 

 elastic, expanding, loose network, the pale reddish threads 3-5 /x 

 wide, marked with transverse ridges, warts, and spines, often 

 arranged in quincunx to give the appearance of prominent spiral 

 lines if not properly resolved by the microscope, but not like the 

 continuous spiral thickenings seen in the genus Hemitrichia; the 

 threads of the capillitium have many free, clavate ends and few 

 attachments to the cup. Spores pale red, smooth with a few 

 scattered warts, 6-9 m diam. 



Type locality: Pennsylvania. 



Habitat: On dead wood. 



Distribution: Common throughout North x^merica. 



Illustration: Lister, Mycetozoa ed. 3. pi. 178. 



