994 



THE HIGHER BACTERIA, MOLDS AND FUNGI 



luxuriantly on those containing sugar. On glucose broth it forms a thick 

 membrane. It liquefies glucose gelatine but does not clot or digest milk. 

 On hexoses it forms lactic acid but does not ferment mannite or dulcite. 

 Species vary in their action on disaccharides. 



Morphology. This is best studied in hang drop cultures. The 

 growth is made up of interlacing, branching septate hyphae. These 

 are delicate (about 2 microns) and of uniform diameter. The spores 



FIG. 113. SPOROTRICHUM BEURMANNI IN HANG DROP (Hopkins). 



are oval or pear-shaped (about 3 by 4 microns) and are found on 

 any part of the hyphse to which they are usually attached by short 

 sterigmata. In de Beurmann's species they are very numerous and 

 form thick clusters at the tips of the hyphae or sheaths along their 

 course. Chlamydospores are also found. 



Species. Sporotrichum Schencki is the species found in most American 

 cases. The cultures are white or slightly brownish. They ferment lactose 

 but not saccharose. The spores are not numerous and have no sterigmata. 



Sporotrichum Beurrnanni is the commonest species in France. The cul- 

 tures soon darken to a chocolate brown. They ferment saccharose but not 



