760 



Sporotrichosis 



their extremities or on branches. They are arranged in cyKndrical 

 cuffs about 10 /i in size and in glomeruh. As a matter of fact the 

 spores are readily isolated from one another. They arise one by one 

 in variable numbers along the mycelium, but as a rule in very large 

 quantity in each segment of the thallus. There is no apparent order 

 in their arrangement. So long as it rema,ins on the filament the spore 

 appears pear-shaped. It is attached by a very fine sterigma, from 

 1-2 M in length and from 0.5 ju in width. When shed, the spore is oval. 

 Its dimensions vary from 3-5-6 /x in length and from 2-3-4 /* in 

 breadth.. The form, the distribution and the brown color of the 

 spores and their fructification in the form of cylindrical cuffs, arranged 

 in branches at the extremities of the filaments, constitute together 



Fig. 320. — Sporothrix schenckii. 

 Margin of living hanging-drop cul- 

 ture (gelatin) X about 150 (Hektcen 

 and Perkins in "Jour, of Exper. 

 Med."). 



Fig. 321. — Sporothrix schenckii. 

 Slant culture on glucose agar, eight 

 days old (Hektoen and Perkins, in 

 "Jour, of Exper. Med."). 



with the original substratum of the fungus, a group of characters 

 which differentiates Sporotrichum beurmanni sharply from all other 

 sporotrichs (Matruchat). 



Hektoen and Perkins thus describe Sporotrichum schenckii: The 

 threads of the mycelium are seen to be doubly contoured; the proto- 

 plasm is somewhat granular and interrupted at fairly regular in- 

 tervals by transverse septa; the diameter of the threads varies some- 

 what, the average being about 2 m; the branches are not frequent and 

 do not bear any fixed relations to the septa. In the hanging-drop 

 cultures the relations of the conidia to the mycelium are very nicely 

 shown. The spore-bearing branches which grow out in a radiating 

 manner from the central feltwork, are commonly tipped by a cluster 



