142 A Monograph of the Myxogastres. 



in the same species, and sometimes in different portions of 

 the same individual we meet with the features of the two 

 supposed genera. Finally in Arcyria, in Rostafinski's sense, 

 the markings, whether in the form of prominent, ridge-like 

 half-rings or spines, are arranged in a spiral manner, and may 

 be looked upon as the remaining portions of continuous spiral 

 ridges, the greater portions of which are obsolete. For the 

 above reasons the two genera proposed by Rostafinski have 

 been merged into one under the older name of Arcyria. 



Distrib. Europe; S. Africa; India; E. Indies; Ceylon; 

 Australia ; N. Zealand ; Tasmania ; United States ; S. America. 

 Species 38. 



A. Eu-Arcyria. Threads of capillitium without continuous 

 spirally arranged ridges. 



* Spores smooth. 



Arcyria punicea, Rost (figs. 242 244). 



Sporangia globose, ovate or elliptical, stipitate, wall vermilion, 

 sometimes with a brownish or purple tinge, rarely yellowish- 

 brown ; stern slender, about equal in length to sporangium or 

 longer, same colour, filled with large cells, expanding at the 

 base into a hypothallus, capillitium and mass of spores dull- 

 vermilion, crimson-lake, brownish, or sometimes yellow-brown ; 

 capillitium dense, protruding elastically, attached at many points 

 to the firm, plicate, persistent basal portion of the sporangial wall, 

 threads combined to form a very irregular network with or 

 without free ends, furnished with prominent half-rings arranged 

 in a very open spiral, remainder smooth ; spores globose, smooth, 

 pink, or pale-brown, 6 8 p. diameter. 



Arcyria punicea, Rost, Mon., p. 268, figs. 190, 192, 197; 

 Cke., Myx. Brit, p. 69, figs. 190, 192, 197 ; Sacc., Syll., vii., 1, 

 n. 1457; Zopf, p. 165. 



Arcyria vcrnicosa, Rost., Mon. Supp., p. 69. 



Exsicc. Jack, Leiner u. Sitz., n. 613; Cke., Fung. Brit, 613; 

 ed. II., 520; Syd., Myc. March., 915; Rab., Fung. Eur., 1914; 



