48 



BOTANY. 



Fiu. 39.— Peronosporo aleinearum. A , yonng oogonium o, and young antheridium 



n, in contact with it ; B, the antheridium » beginning to pierce the oogonmm o, whose 

 protoplasm is becoming condensed j (7, the fine tube of the antheridium n has pen- 

 etrated the oogonium o, and come in contact with its condensed and rounded proto- 

 plasm, the ooi-ptere. X 360.— After De Bary. 





Fio. 40. 



/^ 



Fig. 41. 



Fig. 40. — Female reproductive organs of a moss, V^imiria, hygrtymetrica. A, apex 

 of the stem ; a, archegonia ; b, leaves : S, archegonium ; S, base : h, neck ; m, 

 month ; C, mouth of fertilized archegoninm. A X 100, B X 550.— After Sachs. 



Fig. 41.— Male reproductive organs of the same moss. A, antheridium open and 

 permitting the spermatozolds a to escape ; B, b, speim-cell of another moss {Potytri- 

 chum), with contained spermatozoid : c, spermatozoid free, with two cilia it the 

 pointed eJttremity. A X 350, B X 800.— After Sachs. 



