356 An Introduction to Medical Mycology 



end. On the contrary, with both Aspergillus and Penicillium the spores are 

 formed from the sterigma, the youngest cell being nearest the stalk. 



6. FUSARIUM 



The sterigma is branched. Spores occur as spindle-shaped cells with 

 indistinct cross-walls. 



7. SCOPULARIOPSIS 



The branching of the conidiophore is irregular. Spores appear in chains, 

 are yellowish brown and have a spiny wall. 



8. DEMATIUM 



The hyphae are septate. Arising from them on lateral branches are chains 

 of small black arthrospores. 



9. MYCODERMA 

 The hyphae are septate. Arthrospores form. 



10. TORULA (CRYPTOCOCCUS) 



The surface of the colony may be smooth or rough. The color is often 

 pink. The cells are thin-walled and show budding. There is no mycelium. 



11. CHAETOMIUM 



The spores are produced in a thick-walled spiny pcrithecium. They can 

 be observed microscopically. 



