Leptothrix. 



93 



113. P. multiseptata, Engler ("Pilz-veg. weiss. oder 

 todt. Grundes in der Kieler Bucht "). 

 Beggiatoa multiseptata, Engler {Sitz.-Bericht, 

 Bot. Ver. Provinz Brandenburg, 1882, p. 17). 

 Threads 3-6 /x broad, separated by transverse partitions 

 into short cylinders, whose height is only one-fourth to one- 

 sixth of their breadth. These discs are separated by re- 

 peated transverse and longitudinal division into cocci, 

 which probably become isolated. From these cocci very 

 slender threads arise which afterwards become thicker. 

 Attached to the legs of crabs (Gammarus) in sea-water, 



LEPTOTHRIX. 



114. L. gigantea, Miller (Ber. Deutsch. Bot. Gesell., 

 1883, pp. 221-224, pi. vi.). 



Occuared as bundles or tufts of diverging threads, which 

 varied very considerably in thickness in the same tuft, from 

 •5-4 It,; threads 250 /x, long or 

 more, showing a distinction 

 between base and apex, the 

 thicker ones consisting of 

 articulations, which formed 

 cocci, short rods, or long 

 rods, sometimes all in the 

 same thread. Some of the 

 threads showed a sheath, from 

 which the articulations passed 

 out, collecting in a heap at 

 the extremity. Articulations 

 round, oblong, or pear-shaped ; the larger ones dividing into 

 smaller, first by a transverse and then by a longitudinal 

 septum. Some of the threads assumed, a spiral form, and 

 even approached Spirochsete. (Fig. 79.) 



Fig. 79. 



of a tuft of threads, X 540 ; b, stages 

 of subdivision of the threads (after 

 Miller). 



