116 



TIIK AMl-.Ulc W .\AH ILILIST [Vol. LlII 



from Lerua and Ci-oek can be similarly accounted 



for. In tlii> ca^e, liowcNcr, the two species, S. rarians 

 and S. porticdlis, evidently dilTer in three cliaracters. 

 The characteristics oT rarians have been given above. 



8. portirali.^ (Fig. (->) has vegetative cells 4(^r)()/x X 

 66-2()())U containing a single cliromatophore, making 

 three to four turns. The fertile cells are cylindrical and 

 the zygospore is ovoid, 38- 50 X 50-83 /x. "it, therefore, 

 ditfei's from S. rarUnis in dimensions of the vegetative 

 cells, in the absence of inflated fertiU' cells, and in the 



OVOldloilt nl Mm /\.n.|„,H In Mil. ol .oll(,tl()nS 



all of the ( 1.1 1 i-o.Hl.h n, 1 ii> t (.11^ (.t tii( ^ l,iM( liai 



In the aKMiiipiiiv II . di m> 111, ( Ti- 7) tlu dmunHon 

 factor for rarniiis and junl n-ai is ai'c rciMcstMitcd hv A 

 and a, resped ivelx . 'I he lador loi' the rai iaus tv}>e of 

 fertile cell b\ // .iiid tm Mm i>nifnah. t\iH I.n h The 

 factor foi till ( I ipMii." ..It li^ ( .1. d t.u ll . ..xoid -poic 

 by c. The iiu.'lcn^ r*.ni!<Ml l.v th.' fuM-.n .)t' llif two 

 gamete nuci.M t ticret .^rc ('.uitain- ail tlic taclor- i Aa lib. 

 Tr). Tli(> fm .1 ..1. 1 11. h 11^ < .iitaiii^ in\ .hi. of 



