256 THE NORTH AMERICAN SLIME-MOULDS 



.5 mm. high, .3 mm. in diameter, stipitate; stipe short, one-third 

 the total height, pale brown or yellow ; hypothallus none ; capillitium 

 loose, freely expanding, not deciduous, honey-yellow, the threads 

 generally wide, 4-5 /x, toward the periphery more narrow, 2.5 /i, 

 warted, marked with blunt spinules, which not infrequently pass 

 into distinct transverse, narrow plates or half-rings, free ends cla- 

 vate and numerous; spore-mass yellow, spores by transmitted light 

 smooth, granular, globose, 7-9 /x. 



This species as represented by the material before us seems con- 

 stant in size, color, and microscopic characters, in all which it differs 

 from all species here listed. It resembles somewhat Lachnobolus 

 globosus Schw., but differs in habit, habitat, color, the capillitium, 

 its attachment and in the mode of dehiscence. In the present species 

 the wall is evanescent almost in toto; in L. globosus is it remarkably 

 persistent, and the capillitium is adherent. 



Probably rare. Its smallness removes it from sight of all but 

 tlie most exact collectors. Maine, New York, South Carolina, Ala- 

 bama, Missouri, Iowa; Black Hills, South Dakota; Ontario; — Miss 

 Carrie. 



While usually remotely gregarious a collection from southern Cali- 

 fornia shows that on occasion the entire Plasmodium may pass to fruit 

 with narrowest limits, forming a stipitate, compact, globose mass of 

 crowded, super-imposed sporangia as in Oligonerna nitens. Set Plate 

 XX., Fig. 12. 



12. Arcyria insignis Kalkbr. &" Cke. 



1882. Arcyria insignis Kalkbr. & Cke., Grev., X., p. 143. 



1911. Arcyria insignis Kalkbr. & Cke., List., Mycet., 2nd ed., p. 240. 



Sporangia gregarious or clustered, pale or bright rose-colored, 

 .5-1.5 mm. in height, stipitate, ovate or cylindric; stipe short, .2-.4 

 mm. red, with spore-like cells ; capillitium a close net-work of delicate 

 threads with a few bulbous free ends, with faint transverse bands or 

 short spinules, or nearly smooth, colorless beneath the lens; spores 

 colorless, nearly smooth, 6-8 /x. 



Reported from Mass. by Miss Lister. Should follow No. 8 : 

 apparently a very delicate form of the common species, A. denudata. 



