INTRODUCTION TO C'KYPTOGAMIC BOTANY. 



437 



fully observed the morphosis of the elaters.* The sporangia 

 are at first filled with a mass of oblong cells, some of which 

 are broader than the others. The protoplasm of the broader 

 contracts into a number of separate masses. These occasion- 

 ally are divided again longitudinally, so as to form a double 

 row, and in either case each becomes a mother cell. The 

 nan-ower, on the contrary, produce the elaters (Fig. 91, 6). 



Fig. 91. 



a. Fruit of Cronisia paradoxa. From a sketch in the Hookerian 

 Herbarium. 



b. End of elater of Marcliantia pohjmorpha. 



c. One of the broad cells with the endochrorae breaking w^ into 

 mother cells, after Henfrey. 



d. Section of Archegonium of ditto, with embryo cell, and the proper 

 involucre at the base, after Hofmeistex-. This, in situ, is dependent. 



e. Antheridium of Targionia, after Thuret. 

 /. Spermatozoids of the same . 



g. Sporangium of M. pohjmorpha, and proper envelope.f (See 

 Fig. 92, d.) 



All more or less mae^nified. 



* Linn. Trans., vol. xxi., p. 103. 



t This is said to be formed from the pistillidium, by Henfrey, 1. c. 

 The pistillidium or archegonium, however, is adherent to the base of 

 the pedimcle when the sporangium is protruded. 



