Crenothrix. 



5S 



79. C. Kiihniana (Rabenhorst), Zopf ("Untersuch. 

 iiber Cren." (1879), p. 3). 



Leptothrix Kuhniana, Rabenhorst. 



Hypheothrix Kuhniana, Rabenhorst. , 



Crenothrix polyspora, Cohn. 



? Palmellina flocculosa, Radlkofer. 

 Threads in whitish or brownish tufts, i'S-5 /i thick, 



^ ® @) @§ 



O 



Fig. 57. — Crenothrix Kuhniana (after Zopf). a^ vegetative 

 threads; I, Palmella form ; c, spore-forming threads. 



increasing to 6-9 /* towards the end; joints of very varied 

 lengths. Spores 1-6 ju, in diameter. (Fig. 57.) 

 In wells and drain-pipes, etc. 



