408 BOTANICAL GAZETTE [November 



of archegonia, and though many antheridial plants were mixed 

 with the plants bearing sporophytes, the antheridia with few 

 exceptions had discharged their sperms and fallen off. The few 

 antheridia that were found seem to have been delayed ones. No 

 very young stages were obtained, but the older ones indicate the 

 method of development usual in the Jungermanniales (figs. 29-31). 

 The body of the antheridium is nearly spherical, and the stalk is 

 short and slender. 



Sporophyte 



(% 



divided 



In 



material 



mbryos, so that it is impossible to state with 



whether it is the epibasal or hypobasal cell that divides. Leitgeb 

 mentions that in S. rhizoloba it is the inner cell which remains 

 undivided, and that this cell can be recognized in well developed 

 embryos. He gives a close series of stages for this species, and 

 apparently after the row of three cells is formed there is some 

 variation in the subsequent walls. However, he states that the 

 outermost cell is divided by an oblique wall. This may also be 



asp 



nning 



apical growth which Leitgeb emphasizes very strongly for S. 



oba, and in fact later stages of S. aspera (figs. 3 

 marked segmentation, seem to verifv this method 



ment 



embrvo is slender, and it is earlv shown 



uppermost part is the region most actively involved in cell division, 

 and that part is also marked by a denser cell contents. The 

 middle part is concerned with elongation, and there the cells 

 lengthen, with little activity in cell division (fig. 37). The cell 

 contents in this part is less dense than in the upper part, and it is 

 also greatly vacuolate. The innermost cell of the embryo may very 

 early divide, as shown in fig. 34, but, judging from the general 

 contour of the young embryos and without the aid of figures, it 

 seems probable that cell multiplication in this part of the embryo 



very few div 



formed 



