404 PATHOGENIC STREPTOTHRICES 



properties to it: Very thin, wavy filament, pseudodichotomous 

 division, some filaments broken up into segments; on the surface 

 filaments broken up into coccus-like bodies (spores). The organism 

 grows rapidly under aerobic (not under anaerobic) conditions, both at 

 room and at incubator temperature. The growth is light brown 

 reddish and appears as if covered with a white dust. The colonies on 

 agar are elevated with a depressed centre, uneven, corrugated, and 

 powdered with a white dust. Sometimes they are white and velvety 

 and look like the growth of a higher mould. In bouillon disk-like, 

 dry, isolated colonies are formed on the surface; a complete pellicle 

 does not form. The sediment is granular. Growth on potatoes is 

 rapid ; first reddish, then white. On milk a reddish pellicle is formed ; 

 coagulation does not occur. Subcutaneous inoculation of pure cultures 

 produce abscesses in guinea-pigs, rabbits, and mice. Intraperitoneal 

 or intravenous injections produce pseudotubercular lesions. 



A streptothrix of the same type, also acid fast and leading to 

 pseudotubercular lesions in the lungs of a young man suffering and 

 dying from diabetes, has been described by Butterfield. Since the 

 organism was not obtained in pure culture and no animal experiments 

 were made, it is impossible to say whether it is identical with Strepto- 

 thrix caprae or not. 



QUESTIONS. 



1. What are the characteristics of hyphomycetes or eumycetes? 



2. In what features do they differ from schizomycetes ? 



3. What is the difference between true and false branching? 



4. What is the difference between dichotomous and pseudodichotomous 

 branching or division ? 



5. What is a thallus? 



6. What is a mycelium? 



7. How does the mycelium grow and extend? 



8. Differentiate between phy corny cetes and my corny cetes. 



9. What is the function of the fructifying organ of hyphomycetes? 



10. Name the four types of spores formed by hyphomycetes. 



11. Describe the characteristics of the four different types. 



12. What are copulating cells? What other name are they known by? 



13. What are suspensors? 



14. What is meant by basipetal conidia? What by basifugal conidia? 



15. Why is chlamydospore-formation also called oidium-f ormation ? 



16. Discuss the resistance of spores of hyphomycetes. 



17. What are trichomy cetes ? Why so named? 



18. Name the four genera of the family trichomycetes. 



19. Describe the characteristics of the four genera. 



20. Name a species of leptothrix. Where found? 



21. Name some species of cladothrix. 



22. Have streptothricse been found as the cause of human diseases? . 



23. Why are actinomyces considered separately from streptothricse to which 

 they belong? 



24. Describe the Streptothrix farcinica and the lesions which it produces in 

 cattle. 



25. Describe the morphology, cultural properties, and pathologic lesions of 

 Streptothrix canis. 



26. Describe the morphology, cultural properties, and pathologic lesions of 

 Streptothrix caprse. 



