328 THE MICROSCOPIST. 



2d Genus. Spirillum. Shorter and more distant spiral. 



5th Group. 



1st Genus. Leptothrix. 



1 L. Buccalis. Long, brittle, slender filaments, divided 

 by partition-walls. Occurs on products of decomposition 

 within the mouth ; papillse of tongue, tartar, etc. Also 

 in the intestine, vagina, etc. It is thought by some to 

 produce caries of the teeth. 



2d Genus. Sarcina. 



1. S. Ventriculi. Four-fold flat cubical cells, generally 

 with nuclei. Occurs in vomited fluid, urine, etc. 



In addition to the above (provisional) arrangement, 

 Wagner classifies vegetable parasites with respect to their 

 pathological relations as follows : 



I. MOULD DISEASES. 



These are conditional upon the above-mentioned mould 

 fungi. They occur chiefly upon parts affected with ne- 

 crosis or other lesions, particularly ulcers of the skin and 

 mucous membranes. On free surfaces they present an 

 appearance resembling mould. Perhaps in this connec- 

 tion belongs the foot-fungus, or Mycetoma Carterii, which 

 is endemic in India. 



II. FUNGI OF TRUE PARASITIC DISEASES OF THE SKIN 

 AND MUCOUS MEMBRANES. 



1. Trico^hyton Tonsurans. This consists of round trans- 

 parent spores, or spore-rows. They develop in the roots 

 of the hair and pass into the shaft, so that the latter is 

 destroyed and breaks off. It occurs also in the sheaths 

 of the hair-roots and surrounding epidermis, seldom in 

 the nails. It causes several diseases, especially of the 

 scalp and beard, as herpes tonsurans, porrigo scutellate, men- 



