116 PRACTICAL BOTANY. 



ceptacles. (Fig. 62.) Examine with low power. What 

 is the shape of the conceptacles ? Do you find numerous 

 hairs or paraphyses in the conceptacles ? Do they in some 

 cases project through the ostiole ? Are they branched or 

 unbranched ? Are they unicellular or multicellular ? Draw 

 a conceptacle, showing all you can see under low power. 

 Find small ovoid antheridia borne on the paraphyses, 

 using the high power. (These are seen in Fig. 61, 6, and 

 Fig. 62, 2.) Draw several antheridia, showing their 

 attachment to the paraphyses. Can you distinguish the 

 antherozoids in the antheridia ? Mount in sea water a 

 drop of the orange-colored exudation mentioned above 

 and examine it for moving antherozoids. (See Fig. 62, 3 

 and 4.) These observations are difficult. 



8. Examine under low power transverse and longitudi- 

 nal sections through an alcoholic branch bearing female 

 conceptacles. (See Fig. 63.) What is the shape of the 

 conceptacles? Notice the oogonia. (Fig. 61, c and d, 

 and Fig. 63, 2.) In what part of the conceptacle are 

 they located ? How do they compare in size and shape 

 with the antheridia ? Both the oogonia and the antheridia 

 are modifications of paraphyses. Draw the conceptacle, 

 showing all you can see under low power. 



Examine the oogonia under high power. Notice the 

 transparent covering. Test it with Schultze's solution. 

 Is it cellulose ? In material collected in autumn, find 

 oogonia undergoing division into oospheres. (Fig. 61, 

 cZ, and Fig. 63, 2, 3, and 4.) Make out, if you can, the 

 number of the oospheres. If material bearing the motile 

 antherozoids has also been found, mount some of the 

 antherozoids and oospheres in the same drop of water 

 and watch for the entrance of the antherozoids into the 

 oospheres. Draw. Does each oosphere have a nucleus ? 



References for Reading. Goebel's "Classification of Plants," pp. 

 65-73; Carpenter's " The Microscope," pp. 554-559 ; "Vines' Text-Book 



