MOULDS 245 



articulated at their extremities, and so divide off the spores 

 in the form of segments. The most important members of 

 these groups are the under-mentioned : 



Mucor mucedo. — This is the commonest mould, and is 

 frequently seen growing upon food-stuffs, particularly stale 

 moist bread and upon animal excreta. It possesses a 

 branching mycelium with hyphse bearing the swollen 

 sporangia, or spore-bearers. This mould grows well on an 

 acid medium, forming a white fur, and bears black fructifica- 

 tion heads. It is not pathogenic. 



Mucor iMzopodiformis forms a similar growth to the 

 above. A culture on bread gives rise to an aromatic odour. 



Mucor corymbifer forms a dense white fur on bread, 

 resembling cotton-wool. 



Mucor ramosus grows upon bread and potato as a white 

 fur which soon changes to grayish-brown. 



These last three mucors are pathogenic. Intravenous 

 injection of fluid containing their spores causes a fatal 

 disease in rabbits. 



Aspergillus niger, A. albus, and A. glaucus grow upon 



Fig. 26. — Aspergillus Glaucus. 



bread, candied fruit, etc., on which are seen the stout 

 swollen club-like fructifying hyphae, upon which are 



