994 



ASCOMYCETES AND BASIDIOMYCETES 



or some furrows, radiating from the centre, may be present. The 

 central portion, which is covered with rather long, white duvet, 

 is encircled by a zone of powdery appearance; outside this there 

 is the peripheral zone covered by the extremely delicate, character- 

 istic, silky-like duvet. 



Microsporum villosum Minne, 1907. 



Found in Belgium by Minne in a child suffering from ringworm 

 of the hair clinically identical with the type caused by M. audouini. 

 On Sabouraud's agar the growth at complete development is obout 

 6 centimetres in diameter; the central portion is flattened, with 

 powdery, slightly brownish surface. This is surrounded by 

 mammillary, downy formations, which decrease in size towards the 

 periphery. 



Microsporum tomentosum Pelagatti, 1909. 



Found by Pelagatti in Sardinia in a case of microsporosis capitis, 

 clinically identical with the usual type caused by M. audouini. It 

 grows rapidly on Sabouraud's agar. The growth at complete de- 

 velopment has a somewhat flattened appearance, but several 

 furrows are present, originating from the central portion, which 

 may be umbilicated. The whole surface is covered by thin white 

 duvet. 



Microsporum iris Pasini, 191 1. 



Discovered by Pasini in Italy in some cases of microsporosis 

 capitis, clinically somewhat different from the usual type. The 

 fungus grows well on Sabouraud's agar. At complete develop- 

 ment — twenty-two to twenty-six days from inoculation — the 

 growth presents a central knob covered with white duvet, and 

 surrounded by white and brick-red rings, alternating. 



The microsporosis capitis due to this microsporon is charac- 

 terized by the hairs remaining nearly of normal length, and pre- 

 senting a white-greenish discoloration. 



Microsporum flavescens P. Horta, 1912. 



Isolated by Horta from some circinate squamous patches situate 

 on the neck of a child in Brazil. Grows rapidly on Sabouraud's agar : 

 the growth is of a yellow colour ; there is a depression at the centre, 

 from which radiate four or five shallow furrows. Pleomorphic 

 duvet appears quickly. 



Microsporum depauperatum F. Gueguen, 1912. 



Isolated by Gueguen from some circinate, dry, squamous patches. 

 In cultures the membrane of some nucleal filaments presents 

 peculiar thickenings. Spore-bearing hyphae are not so well differ- 

 entiated as in other species. 



