428 ELEMENTARY BIOLOGY. [ CHAP - 



a. Large unbranched hyphse, each ending in a 

 spherical enlargement {sporangium). 



3. Examine with \ obj. 



a. The hyphae. 



a. Their size; they greatly exceed the hyphfe of 

 Penicillium both in length and diameter. 



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

 ular protoplasm, vacuoles; septa absent ex- 

 cept close to the sporangium. 



y. Treat with iodine and magenta or hema- 

 toxylin; the protoplasm is stained and nuclei 

 may be made out. 



S. 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. 



j8. 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. 



S. The collar projecting around the base of the 

 columella of burst sporangia. 



