Crenothrix. 



55 



79. C. Kiilmiana (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, 1*5-5 p* thick, 



Fig- 57- Crenothrix Kiihniana (after Zopf). a, vegetative 

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



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

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

 In wells and drain-pipes, etc. 



