94 MINNESOTA BOTANICAL STUDIES. 



Fischer, also, old material in the Berlin herbarium marked J/. 

 juglandis goes here. We maj^ therefore, be compelled to use 

 this name instead of M. racemosus. 



Sporangiophores erect, of various sizes, 5-40 mm. high, or 

 small and frail, richly and irregularly branched, each branch 

 terminating in a sporangium; sporangia small, round, of various 

 sizes (depending on the nourishment), 20-70 mikronsin diam., the 

 membrane not dissolving but splitting; columella broad clavate 

 or obovate; spores round or short ellipsoid, singly colorless, 

 yellowish in mass, 6-10 x 5-8 mikrons. 



"When grown in a solution it forms septa rapidly and grows by 

 budding, and in this state it is a ferment. Under poor condi- 

 tions it forms round, oblong or ellipsoid chlamydospores here 

 and there in the hyphae and even in the sporangiophores. 



None of the other well described European species are 

 recorded for this country. Other species reported from North 

 America are: 



Miicor intequalis Peck, 26 Rep. N. Y. St. Mus. 79. 1874. 



"Fertile liocci simple or once or twice divided, white; spor- 

 angia globose, at first white, then bluish black or brownish 

 black; spores somewhat angular, subglobose, very unequal in 

 size, .0002— .0005 in. in diameter." (Peck, 1. c.) 



On decaying squashes. 



The size and shape of the spores agree well with Ascopliora 

 mucedo. It may represent a young specimen of this fungus. 

 But the description seems to indicate a Mucor, as branched, 

 white sporangiophores are mentioned. As to the shape of the 

 spores, compare M. heterosporus Fischer. 



Mucor ciirtiis Berkeley and Curtis, N. A. F. No. 703. 



Spores fusiform, subappendiculate at each end, 11x2 mikrons. 

 On decaying muskmelon, South Carolina. 



The shape of the spores is peculiar and makes it doubtful if 

 this is a Mucor. 



Mucor echinophila Schweinitz. North Am. Fungi. No. 



2742, p. 285. 



On spines of the involucre of Castanea sativa, Bethlehem, Pa. 

 The very meager description baffles identification. 



Mucor tenerrimus Berkeley. Outlines. 407. 



Reported from North America in the Sylloge Fungorum. Ac- 

 cording to Fischer may be a Myxomycete, but certainly is not 

 a Mucor. , 



