122 THE NORTH AMERICAN SLIME-MOULDS 



applied is 2.5 mm. high and has spores 4-5 ft. This is now 

 made to constitute one extreme of a series of which great speci- 

 mens from the coniferous forests of Washington constitute the 

 other. The plasmodium of the phase common in the Mississippi 

 valley is of a peculiar greenish white, difficult to describe. It is 

 the color of a green lemon, perhaps "sap green" describes it; 

 the plasmodium of the Nicaraguan type is still unknown. 



Widely distributed. From Alaska to Nicaragua, from New 

 England to Oregon and Washington. 



ii. STEMONITIS CAROLINENSIS Macbr., nom. nov. 



PLATE XIII., Fig. 5 ; PLATE XVIII., Fig. i. 

 1894. Stemonitis tenerrima B. and C, Morg.,/<wr. Cm. Sac., p. 53. 



Sporangia tufted in scattered clusters, small, slender, cylindric 

 but tapering from the apex, at first ferruginous then ashen or 

 purplish, stipitate ; the stipe short, black and shining, one-fourth 

 the total height or less, even ; hypothallus well developed, 

 black or very dark brown ; columella black, gradually diminish- 

 ing, at length dissipated some distance below the clavate or 

 acuminate apex of the sporangium ; capillitium dense, the inner 

 of many scarcely expanded, pallid, freely anastomosing branches, 

 the outer a net of very small meshes often less than the spores, 

 3-15 fi, peridial processes imperceptible; spore-mass pale fer- 

 ruginous, spores by transmitted light pale violaceous brown, 

 smooth, 6-7 /JL. 



Very closely related to the preceding, but recognizable by 

 its proportionately more slender sporangia, paler color, and 

 especially by its dense capillitium and remarkably close-meshed 

 net. 



This species is well described by Morgan, I.e., but from the 

 original description by Curtis of 5. tcncrrhna, Am. your., VI., 

 p. 352, and from the account of the same species given by 

 Lister, op. cit., p. 122, it is plain that we have here to do with a 

 form entirely unlike that of the English authors. A new name 

 is accordingly suggested. By the kindness of Mr. Morgan we 

 have specimens both from South Carolina and Ohio. 



