326 



Mycological Bulletin No. 77 



[Vol. V 



h 



a Sporangiophore of Pilobolus crystallinus. b Spores of same, 

 c Sporangiophores of Sporodinia aspergillus. d Spores of same. 

 Fig. 248. Illustrations of Moulds. 



PHYCOMYES. 



In general appearance the species of this genus resemble the species of 

 Mucor. The chief difference is in the formation of zygospores. The 

 metallic appearance will generally separate it from Mucor. 

 Phycomyces nitens (Acardh) Kunze. 



The sporangiophores are simple, olive brown, very large, 7-:!() cm. long; 

 the sporangia are round, large ; columella, pear shaped ; spores ellipsoid. 

 It grows on oily substances. Ground flax seed makes a good medium for 

 cultivation. 



PILOBOLUS. 



This genus is easily recognized by the peculiar formation of the spor- 

 angium whose upper part is cuticularized. The sporangiophore is very 

 much enlarged or distended right below the sporangium. 



PiLOROLUS CRY.ST.M.LINU.S ( WlCGERsl ToDE. 



This is common on horse dung. The sporangirm is bbick ;mu1 ;'t ma- 

 turity is thrown off with considerable force; tb.e '■ixu'i.s ari' colorless or 

 yellowish. 



SPORODINIA. 

 This is a monot\i)ic genus and is known by the dicliotoniously branclied 

 sporangio|)li<)res, 



Si"()i<oiMNi.\ ,\sPEK(;n.i.r.s ( Scopoi.i ) Sciikdktkr. 



Tlie sporangia are variously colored, l)ul nsu;il1y brown or black at ma- 

 turity. The spores are round or ellipsoid. It grows on l*>o]eti and .\garlcs. 



All figures were drawn bv Stella Sumstine, not to any delinite scale. 



The Mycoloeical Bulletin is issued Monthly, Price 2Sc. Copies of Vol. 11 '1904\ Vol. Ill 

 (19051 and Vol. IV 1 1906' may be had for 50 cents each, or cloth bound copies for 75 cents. 

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