BRYOPHYTA— HEPATIC.E 



109 



faces root hairs are originated which may be found, on section 

 of the structm-e, passing down the centre of the stalk. 



The sporophyte or sporogonium arises in the manner de- 

 scribed for the whole group. After the division of the oospore 



Fig. 868. 



Fig. 868. 1. Thallus of Marchantia bearing archegoniopliores. a, b, c, d, f. 

 Successive stages in their development. 2, 3. Upper and under appear- 

 ances of archegoniopliore when the sporogouia are mature. 6. Young 

 sporogonium. 7. Adult sporogouiiun dehiscing and discharging the 

 spores. 8. Elater, ^vith mother cells of spores adhering to it. After Kny. 



into epibasal and hypobasal segments, two other walls are 

 formed at right angles to each other and to the basal wall, 

 dividing the oospore into octants. The hypobasal octants 

 give rise to a somewhat bulky foot, while the epibasal ones 



