Arcyria 257 



Type locality: Europe. 



Habitat: On dead wood. 



Distribution: *California, Colorado, Indiana, Louisiana, 

 *Maine, Massachusetts, New York, Ontario, *Oregon, Pennsyl- 

 vania, Quebec, *Washington. 



Illustration: Lister, Mycetozoa ed. 3. pi. 180. 



The sporangia resemble those of A. incarnata var. fulgens in 

 color and appearance and ma\' be confused therewith, but the 

 expanded capillitia are longer and more drooping. The important 

 distinguishing characters are the persistent plates of the sporan- 

 gial wall adhering to the capillitium, and the more numerous and 

 usually larger spines on the threads. 



14. Arcyria virescens G. Lister, Jour. Bot. 59: 252. 192L 

 (N. Y. B. G. no. 12845, authentic material.) 



Plasmodium white (Lister). Sporangia crowded or clustered, 

 often forming large colonies, stalked, cylindrical, yellowish green; 

 cup of sporangium narrowly funnel-shaped, reticulate and spinose 

 on the inner side. Stalks slender, straight or flexuose, dark olive- 

 green, free or adhering in clusters of three to ten, 0.5 to L5 mm. 

 long. Capillitium a loose elastic network of greenish or yellowish 

 threads, free from the cup, and expanding into a column about 

 6 mm. long; threads 4-6 n wide, marked with scattered groups of 

 close-set, prominent, transverse ridges 3-5 m high, arranged more 

 or less in an open spiral, the remaining surface irregularly reticu- 

 late and roughened with delicate, often broad-based spines. 

 Spores yellowish green in mass, 7-8 n diam., smooth, except for 

 a few scattered warts. 



Type locality: Ceylon. 



Habitat: On dead wood. 



Distribution: *Iowa, *Oregon. 



Illustration: Lister, Mycetozoa ed. 3. pi. 222. 



This species resembles A. nutans. Aside from the American 

 collections reported, it has not been found except in the tropics. 

 I have not seen either of the American gatherings. 



15. Arcyria occidentalis (Macbr.) Lister, Mycetozoa ed. 2. 245. 

 1911. 



Lachnobolus occidentalis Macbr, N, A. Slime-Moulds 188. 1899. 

 Lachnobolus incarnatus Macbr. Bull. Nat. Hist. S. U. Iowa 2: 126, 1892, 



