THE MYXOMYCETES OF EASTERN IOWA. 



[continued.] 



By THOS. H. McBRIDE. 



To the list of species concluded on page i6r "of the present 

 volume ma}^ be added the following: 



1. Physarum oblatum Macbi-ide. n. s. Plate XI, Figs. 3, 



3« and 3^. 



Sporangia gregarious, stipitate, small, bright yellow, de- 

 pressed globose, rough; stipe reddish brown or fulginous, 

 even, slender, hypothallus none; columella none; threads of 

 the capilhtium yellow, delicate connecting the rather dense 

 and abundant yellow lime granules; spores minutely rough- 

 ened under high magnification, 9-1O//, black in mass, under 

 the lens violet. 



A very delicate and beautiful little species collected by Mr. 

 Shimek near Iowa City; to be compared with P. citrinellum 

 Pk., from which it differs in its 3'ellow capillitium and larger 

 spores; and with P. chrysotrichuni B. t& C. from which it dif- 

 fers in being stipitate as well as in other particulars. 



2. Physarum columbinum Macbride. n. s. Plate XI, Figs. 



2, 2a and lb. 



Sporangia thin-walled, stipitate, gregarious, dove-colored 

 or ashy, delicately flushed, when fresh, with rose, dotted very 

 sparingly with minute white calcareous granules; stipe snow- 

 white, about equal to the diameter of the capsule or a little 

 longer, even; hypothallus none; columella none; threads of 

 the capillitium white, very delicate, with abundant calcareous 



