APPENDIX. 
BRIEF DESCRIPTIONS OF A FEW REPRESENTATIVE 
PATHOGENIC MICRO-ORGANISMS WHICH 
ARE NOT BACTERIA. 
CHAPTER XXXVII. 
THE STREPTOTHRIX GROUP—FAVUS AND RINGWORM 
FUNGI. 
THE varieties of the streptothrix group have as yet 
not been clearly described. Some at least are patho- 
genic. This.group of micro-organisms while having 
many affinities with the bacteria, yet differs from them 
in many important respects which link them with the 
fungi. They develop from spore-like bodies into 
cylindrical dichotomously branching threads which 
grow into colonies, the appearance of which suggests a 
mass of radiating filaments. Under favorable condi- 
tions certain of the threads become fruit-hypsx, and 
these break up into chains of round spore-like bodies, 
which do not, however, have the same staining reac- 
tions nor resisting powers as true spores. The tubercle 
grass and diphtheria bacilli are by some believed to 
properly belong in the streptothrix group on account 
of the true branching forms developed by them under 
certain conditions. The best known of the strepto- 
thrix group is the actinomyces fungus. 
