48 Structure and Classification of Micro-organisms 



pusillus, Mucor septatus, and Mucor conoides are said by 

 Plaut* to be pathogenic when introduced into laboratory 

 animals. Mucor corymbifer has been known to produce 

 inflammation of the external auditory meatus in man.f 

 General mucor mycosis in man has also been observed by 

 Paltauf J to result from the presence of the same organism. 



Fig. 12. Mucor mucedo. Different stages in the formation and 

 germination of the zygospore: i, Two conjugating branches in contact; 

 2, septation of the conjugating cells (a) from the suspensors (&) ; 3, more 

 advanced stage in the development of the conjugating cells (a) ; 4, ripe 

 zygospore (6) between the suspensors (a); 5, germinating zygospore 

 with a germ-tube bearing a sporangium (after Brefeld). 



4. Aspergillus and Eurotium. The organisms of this genus 

 are included among the Ascomycetes. They are common 

 organisms of the air and frequent contaminations of the solid 

 culture-media. To secure them an agar-agar plate can be 

 exposed to the atmosphere of the laboratory for a short time, 

 then covered and stood aside for a day or two, when tangled 

 mycelial growths with rapidly spreading hyphae will usually 

 be discovered. The recognition is easily made when the 

 sporangia appear. These are well shown in the accompany- 

 ing illustration. The mycelium is divided into many cells. 



* Kolle and Wassermann, "Die Pathogenen Mikroorganismen," 

 1903, i, 552. 



t Htickel-Losch in Fliigge, "Die Mikroorganismen." | Ibid. 



