190 TFIE NORTH AMERICAN SLIME-MOULDS 



1. Enerthenema papillatum (Pers.) Rost. 



Plate V., Fig. 3. 



1801. Stemonitis papillata Pers., Syn., p. 188. 



1828. Enerthenema elegans Bowm., Trans. Linn. Soc, XVI., p. 152. 



1862. Comatricha obtusata Preuss, Sturm, DeutschL Flora, PI. LXX. 



1876. Enerthenema papillatum (Pers.) Rost., Mon. A pp., p. 28. 



Sporangia scattered or crowded, stipitate, spheroidal, naked, black 

 fuscous, above, shining, adorned with a minute, black papilla ; stipe 

 black, opaque, conical or attenuate upward, about equal to the perid- 

 ium; columella at the apex expanded into a shining disk; capillitium 

 springing from the lower side of the disk or from its edge, made up 

 of scarcely forked threads which are free below; spores violaceous or 

 fuscous black, minutely warted, 10-12 /u. 



Rare. Wisconsin, Ohio, South Carolina, Illinois, Pennsylvania, 

 Iowa, Colorado. 



This is one of the few species so well marked that Persoon's de- 

 scription, I.e., is definitive: "Stylidio toto penetrante. Capillitium 

 exacte globosum, sub-compactum, in eius apice stylidium papillae in 

 modum prominet." For this reason Bowman's specific name elegans 

 is discarded. 



2. Enerthenema berkeleyanum Rost. 



1876. Enerthenema berkeleyanum Rost., Mon. App., p. 29. 

 1913. Enerthenema syncarpon Sturgis, Myxo. Col., II., p. 448. 



This species corresponds to the preceding in all respects except in 

 the fact that the spores are clustered in groups of four to twelve and 

 are a little larger, 11-13 /x, strongly spinulose on the exposed surface. 



Dr. Sturgis reports this from Colorado, /. c., but discards Rosta- 

 iinski's specific name on the ground that the type has disappeared ; 

 only the spores of some fungus hyphs remain in the place and these 

 may have been mistaken by Berkeley. This seems hardly possible 

 since such supposition would not account for the generic reference 

 either by Berkeley (and Broome) or by Rostafinski. The description 

 in the Monograph is minute as that of one who had the form under 

 his lenses. Rostafinski saw Berkeley's specimens. 



