484 FISSION FUNGI WITH VARIABLE VEGETATIVE FORMS. 



Spirillum sanguineum (Ophidomoiias sanguinea) (according 

 to Zopf belongs to the Beggiatoa, see page 488). Threads 

 3 p. or more in thickness, with 2 to 2^ turns, 9 to 12 n. in 

 width. A flagellum at each end. The spirals, which have a 

 reddish shimmer, present a dark granular appearance, owing 

 to the presence of numerous highly refracting reddish 

 granules. Found by Warming and Cohn in putrefying 

 brackish water. In such water, which occurs in harvest in 



Fig. 134. (After Cohn.) 



A, Spirillum volutans X 650. 



B, Spirillum sanguineum (Ophidomonas sang.) X 600. 



many lakes on the Danish coast, and in which many alga? and 

 salt water phanerogams decompose with the simultaneous 

 appearance of red patches and masses, Warming found some 

 other forms of spirilla, which as a rule contained granules of 

 sulphur in their cell contents, and which he distinguished 

 under the names Spirillum violaceum, Rosenbergii, atteima- 

 tum, &c.* 



Spirillum leucomelsenum. A form of rare occurrence 

 (observed in water on the top of decomposing algas), but which 

 is noteworthy from the fact that alternate black and clear 

 spaces occur in the spirillum, occasioned by the accumulation 

 in the interior of the rod of dark granular substances at 

 regular intervals. f 



IY. FISSION FUNGI WITH VARIABLE VEGETATIVE 

 FORMS. 



A considerable variation in form lias been recently 

 demonstrated by Zopf 's investigations in the case of the 



* Warming, Videnskabellge Meddeddser fra den naturhist. Fwening i 

 Kfobenhavn, 1875, p. 398. Cohn, Beitrage, vol. i., Part 3, S. 169. 

 f Kooh, Mitth. a. d. Ges. Ami., i., p. 48. 



