METHODS 



3' 



f 



fonaiag a sort of suspensor, and a terminal portion, 

 four tiers of h all f the tporogonium except the 



pcnsor is ;>robable that two of the three pri- 



mary cells of the embryo contntmtr to the suspensor, while all thr 

 cf the sporophyte foot, seta and capsule is derived from the terminal 

 was not positively demonstrated. 



A. Longitudinal section of an embryo of PalUnwmio rodistUoM, x joa 



B. C. Cross-sections of embryos of about the same age, of P. Ltvitri. The 



shown in B was cut somewhat obi HI 



The lower suspensor cell does not undergo any further division, but 

 the upper one may <1 or three times, and there results an ex- 



tremely conspicuous luustorial organ of the same character as that ob- 

 served in Jungennanniales, both acrogynous forms like Jumgfr- 

 monnia bicuspidata and anacrogynous types like Aneura. (See Leitgrb 

 Clapp[i|.) 



Material was wanting for the next stages of development, but to 

 judge from such stages as those shown in Fig. 16. C-E. the first division 

 in the terminal cell of the embryo is vi 1 this is followed later by 



There is, however, a certain degree of 

 irregularity in tlu is. as there is considerable variation in the ar- 



'ncnt of the cells in different embryos. 



The upper part of the embryo rapidly elongates, and forms a nearly 

 rioal body, the apex of which is slightly enlarged, and marks the 



