428 ELEMENTARY BIOLOGY. [CHAP. 



a. Large unbranched hyphae, each ending in a 

 spherical enlargement {sporangium). 



3. Examine with \ obj. 



a. The hyphse. 



a. Their size; they greatly exceed the hyphae of 

 Penicilliiwi both in length and diameter. 



/?. Their structure; homogeneous cell-wall, gran- 

 ular protoplasm, vacuoles; septa absent ex- 

 cept close to the sporangium. 



y. Treat with iodine and magenta or hagma- 

 toxylin ; the protoplasm is stained and nuclei 

 may be made out. 



8. Treat another specimen with Schulze's solu- 

 tion; the cell-wall is stained violet. 



b. The sporangia. 

 Examine with \ obj. 



a. Their size and form. 



b. Their structure. 



a. The homogeneous enveloping cell-wall, cover- 

 ed by irregular masses of calcic oxalate. 



/?. The granular protoplasmic contents : un- 

 segmented in some ; divided into a great 

 number of distinct oval masses (spores) in 

 others. 



y. The projection into the sporangial cavity of 

 the convex septum {columella) which separates 

 the hypha from the sporangium. 



8. The collar projecting around the base of the 

 columella of burst sporangia. 



