294 THE BIOLOGY OF THE PLANT 



the ostiole ? ISTotice attached to the former small 

 ovoid cells, the antheridia. To what part of 

 the hairs are the antheridia attached ? Do you 

 find more than one antheridium borne on a sin- 

 gle hair ? JSTotice the contents, the anthero- 

 zoids, of the antheridia. 

 Draw a conceptacle as seen under the high power. 

 Draw also several hairs with their attached antheridia, 

 and some of the cells forming the central tissue. 



3. The female conceptacles. — Prepare sections 

 showing female conceptacles. Study these as 

 directed above, and compare the sections in 

 every respect with those containing the male 

 conceptacles. Compare the female with the 

 sterile and the male conceptacles as regards 

 form, size, contents, etc. Examine especially the 

 obgonia. What is their shape ? How do they 

 compare in size with the antheridia ? Are they 

 borne upon hairs like the latter? If not, how 

 are they held in place within the conceptacle ? 

 How does the number of oogonia compare with 

 the number of antheridia in a conceptacle ? Has 

 each oogonium a covering? If so, what is its 

 structure ? Can you detect any outgrowths, e. g., 

 cilia, on it ? Do you find the contents of any 

 of the oogonia to be divided in several parts or 

 oospheres? If so, how many such parts can 

 you distinguish in a single oogonium? Does 

 each part have a nucleus ? Is each part a cell ? 

 Mount a section in a drop of fresh water. What 

 happens to the coverings of the oogonia ? 



How are the male and the female concepta- 

 cles distributed in the same or in different 

 plants? What is their relation to the sterile 



