494 FISSION FUNGI WITH VARIABLE VEGETATIVE FORMS 



than with the lower monads, with which they have, however, 

 certain morphological resemblances. Common to them are 

 also the dark granules which are present in the pale red cell 

 substance, and which probably consists of sulphur (compare 

 Beggiatoa) ; and also their active movement caused by flagella. 

 Colin has distinguished the following varieties :* 



Monas vinosa. Spherical or oval cells about 2'5 ju. in 

 diameter, often united in pairs. Cell substance pale red with 

 dark granules. Active swarming movement ; flagella not 

 observed. 



Monas Okenii. Short cylindrical cells, 5^. in breadth, 8 to 

 15/*. in length, rounded at the ends, slightly curved. Actively 

 mobile ; a flagellum at one end twice as long as the cell. Pale 

 red cell substance with dark granules. 



Rhdbdomonas rosea. Spindle-shaped cells 3*8 to 5 ju. in 

 breadth, 20 to 30 /i. in length; slow trembling movement; a 

 flagellum at one end. Very pale-coloured cell substance with 

 dark granules. 



C D 



Fig. 139. Monads. (After Cohn.) 



A, Monas vinosa. B, Monas Okenii. 



6', Monas Warmingii. D, Rhabdomonas rosea. 



Monas Warmingii. Similar to Monas Okenii, but more 

 robust; 15 to 10 /u. in length, 8 /j.. in breadth; tumbling 

 movements ; a flagellum at one end. The pale red cell sub- 

 stance only contains dark red granules at each end ; the ends 

 are rounded. 



* Beitrage z. Biol. d. Fftanzen, vol. i., Part 3. 



