296 THE MYXOMYCETES 



1891. Hetniarcyria obscura Rex, Proc. Acad. Nat. Sc. Phila. 395. 



1892. Arcyria paradoxa Massee, Mon. 160. 

 1892. Arcyria karsteni (Rost.) Massee, Mon. 168. 



Fructification plasmodiocarpous, with a tendency to form distinct 

 sessile, globose sporangia, 0.3-0.5 mm. broad, color brownish red; 

 capillitium a sparingly branched network, with free ends few, the 

 threads marked by seven or eight faint spirals, the interspaces narrow, 

 dull red in color and 2.5 ju in diameter; spores yellow, delicately warted, 

 10-12 ix. 



This is doubtless a very rare species. In the description we have 

 followed Dr. Rex, as being more to the point for American forms. 

 It is not improbable that the American material may after all be 

 distinct, as discrepancies, if one may judge by descriptions, are not 

 few. Lister, who had a slide from Dr. Rex, considers the European 

 and American forms the same. 



In outward appearance, plasmodiocarpous phases of this species 

 very closely resemble forms of Licea or Ophiotheca, and are in 

 consequence often wrongly labelled. 



Ontario, Colorado, Montana, Washington; Europe, Ceylon, Japan. 



3. Hemitrichia chrysospora Lister 



Mycetozoa 180. 1894. 



Sporangia sessile, crowded or scattered, subglobose or forming short 

 plasmodiocarps, 0.5-1 mm. in diameter, bright yellow, glossy; perid- 

 ium membranous, with granular thickenings; capillitium a network 

 of branching yellow threads, 4-5 fx in diameter, with four or five nar- 

 row, close spirals connected by longitudinal stride, the threads often 

 attached to the sporangium wall and with many short, pointed free 

 ends; spores yellow, strongly reticulated with narrow, prominently 

 raised bands, forming 6-9 meshes to the hemisphere, 14-18 /x, the 

 border 1.5-2 ix wide. 



Said to be closely allied to Trichia verrucosa. 



England, Germany. 



4. Hemitrichia stipata (Schw.) Macbr. 



N. A. Slime-Moulds ed. 2. 262. 1922. 

 PI. XX, Figs. 527, 528, 529. 



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

 1876. Hetniarcyria stipata (Schw.) Rost., Mon. App. 41. 

 1894. Arcyria stipata (Schw.) List., Mycetozoa 189. 



Sporangia crowded, short-stipitate or nearly sessile, 1.5-2 mm. tall, 

 erect or more or less superimposed, in fresh collections copper colored 



