FIG. 254. The female plant of a leafy liverwort (Porella) 



A, habit sketch of the upper surface, with the two rows of leaves at the sides ; B, 

 a portion of lower surface, showing the third row of small leaves (amphigas- 

 tria) ; O, the stalked sporophytes with open spore cases sc ; D, a sporophyte 

 with the spore case split lengthwise into four parts. After Campbell 



FIG. 255. The antheridia of a leafy liverwort (Porella) 



A, portion of male plant, illustrating the small antheridial branches at the side; 

 -B, section of an antheridial branch, showing two antheridia situated jut above 

 the attachment of the leaves I ; C, the much-elongated sperm, with the two cilia 

 at one end and the remains of the parent cell at the other. C, after Campbell 



286 



