96 MINNESOTA BOTANICAL STUDIES. 



On greasy, oily substances. Pound also on a decaying squash 

 at Lincoln. 



A beautiful species, quickly recognized by its metalic appear- 

 ance. The sporangiophores have the look of small flattened 

 wires. 



3. SPINELLUS Van Tieghem. Ann. Sc. Nat. vi. 1 :66. 1875. 



Aerial mycelium more or less developed, several times 

 branched, with short, thorn like side branches. Sporangio- 

 phores simple. Zygospores formed on the aerial mycelium. 



United with Mucor by Schroeter, The aerial mycelium, upon 

 which the zygospores are formed, connects with Sijzygites. 



Spinellus rhoml)Osporus (Ehrb.) 



Mucor rhombosporus Ehrb. 1818. Sylv. Myc. Berol. 25 (ex. Link.) 

 Mucor fusiger Lk. Sp. PI. VI, 1: 93. 1824. 

 Spinellus fusiger {hK.) Ya'S Tiegh. 1. c. 1875. 



Aerial mycelium formed of richly divided branches beset 

 with single or 2-4 verticillate, pointed, thorn -like branches; 

 sporangiophores borne only on the thorny aerial mycelium, 

 single, unbranched, rigid, erect, below bulbous-inflated, taper- 

 ing to about half the breadth, blue gray, chocolate brown at 

 maturity; sporangia spherical, black at maturity, membrane 

 quickly disappearing, 180-300 mikrons in diam. ; columella large; 

 spores spindle shaped, rounded at the ends, sometimes twisted 

 or spirally curled, brown, 80-40x9-12 mikrons. 



On Agarics. Reported from the United States by Berkeley 

 and Curtis. According to Link 1. c. 31. rliombosporus Ehrb. is 

 his M. fusiger, and Fischer cites Ehrenberg's own opinion to 

 the same effect. 



4. SYZYGITES Ehrenberg. Sylv. Myc. Berol. 25. 1818. 



Sporodinia Lk. Sp. PI. A^. 1: 9i. 1824. 



Sporangiophores erect, repeatedly dichotomously branched, 

 forming septa at maturity; sporangia on the ends of the 

 branches. Zygospores borne on a specially developed, erect, 

 dichotomously branched mycelium. 



Ehrenberg named the zygospore bearing mj^celium Syzygites. 

 Link gave the name of Sporodinia to the asexual fructification 

 six years later. 



Syzygites aspergillus (Scopoli.) 



Mucor aspergillus Scop. Flor. Carniol 494. 1772. 

 S. megalocarpus Ehrb. 1. c. 1818. 



