THE ASEPTIC CULTIVATION OF MYOETOZOA. 53 



In some cultures the sporangia are imperfectly developed. 



A typical sporangium of Stemonitis A measures about 

 3 mm. in height, including the stalk, which is 0"167 mm. The 

 diameter of the sporangium is about 0*3 mm., and is usually 

 uniform throughout. The sporangium may be thicker toward 

 the apex or base. The apex is usually rounded, but at times 

 is more acute ; the base may or may not be symmetrical. The 

 measurement of the stalk given above is about the average, 

 and applies to fig. 9. In a few instances the capillitium 

 extends to the hypothallus ; in other instances the stalk may 

 be 0"5 mm. long. The columella tapers gradually from the 

 base to near the apex, where it divides into several branches, 

 becoming continuous with the capillitium. Occasionally one 

 finds a spindle-shaped thickening of the columella. The 

 primary branches of the capillitium usually come off at an 

 acute angle from the columella, forming one series of anasto- 

 moses, and tlien divide into smaller branches, which go 

 obliquely to the surface network. The surface network usually 

 extends over the entire sporangium. The meshes of the net- 

 work average from 8 to 33 fx. On the surface network are 

 distributed small wart-like thickenings. The colour of the 

 capillitium is a brownish violet. The spores measure 7 — 13 /x, 

 and are of a violet-brown colour; the membrane is finely warted. 



The sporangia of Stemonitis B (fig. 10) measures 3'5 — 

 3"83 mm. in height, not including the stalk, which is about 

 1"37 mm. long. They are tolerably uniform in thickness, 

 measuring about 0'27 mm. in diameter. The columella 

 tapers gradually from the base to near the apex, dividing into 

 branches which become continuous with the capillitium. The 

 capillitium fibres come off at right angles to the columella, 

 forming one series of anastomosing arches from which pass 

 out secondary fibres placed perpendicular to the surface ; they 

 break up into branches which become continuous witii the 

 surface netAvork. The capillitium is of a dark violet-brown 

 colour. At the point where the primary fibres anastomose 

 one frequently finds membranous expansions which are more 

 marked than in the sporangia of Stemonitis A, but these 



