TRICHOPHYTON POLYGONUM 



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Trichopliyton polygonum Uribmu, 1909. 



Endothrix. The growth is at first roundish, then takes a char- 

 acteristic polygonal outline. The central part is crateriform. 



Trichophyton regulare Sabouraud, 1909. 



Endothrix; very similar to T. tonsurans, the cultures being at 

 first crateriform; then, the edges of the crater becoming under- 

 mined, the growth takes a peculiar pouch-like shape, with several 

 radiating small sulci. The characters of the fungus show always 

 the greatest regularity, never changing; hence the name T. regulare 

 given to it by Sabouraud. This fungus was found by Dalla Favera. 



Trichophyton umbilicalum Sabouraud, 1909. 



Endothrix; cultures are deeply umbilicated; present at the 

 periphery fine radiating hyphae, forming a sort of aureola. 



Trichophyton fumatum Sabouraud, 1909. 



Cultures crateriform, taking when old a yellowish-brownish 

 colour, compared by Sabouraud to the colour of a dead leaf. This 

 Trichophyton is fairly common in some parts of Italy. 



Trichophyton effractum Sabouraud, 1909. 



Cultures at first very similar to those of T. tonsurans, being 

 crateriform; when old, the growth becomes very dry, and the 

 surface splits from the edge. 



Trichophyton currii Chalmers and Marshall, 1914. 



This fungus was found in an epidemic of ringworm in a Khartoum 

 school. It is not the common fungus of the town, which appears 

 to be T. violaceum var. khartoumense. T. currii is of the type 

 endothrix, and grows aerobically, but not anaerobically. It forms 

 ladder-like rows of mycelial spores in the hairs. These spores are 

 usually 4-2 microns in breadth, and they and the mycelium resist 

 the action of caustic potash. It forms neither acid nor gas in mono- 

 saccharids, disaccharids, trisaccharids, polysaccharids, glucosides, 

 or alcohols. It does not alter litmus milk. It does not liquefy 

 gelatine. On Sabouraud' s agars it produces white growths with a 

 central knob, a white plateau with a slight circular marking, and a 

 peripheral fringe. It grows on carrot, potato, but was not char- 

 acteristic on beetroot, and was poor on Buchanan's and Loeffier's 

 media. Inoculations directly from the patients' heads failed in 

 monkeys, cats, dogs, and mice. In man it gives rise to a type 

 of tinea capitis tropicalis. 



Genus Neotrichophyton Castellani and Chalmers, 1918. 



Definition. — Trichophytineae with mycelium and spores present 

 in the lesions, and conidial-bearing hyphae in cultures, attacking 

 hairs, but with mycelial spores and filaments outside the hair shaft. 



