MOSSES AND LIVERWORTS. 113 



* 



SPECIAL STUDIES. 



I. Development of the gemmae. Lunularia offers ex- 

 cellent and abundant material for this, and its 

 gemmse, on account of their simplicity, are among 

 the best objects with which to begin studies of 

 developmental history. 



II. Comparison of the anatomy of Conocephalus with 

 that of Marchantia. The latter is selected because 

 of its being so fully described in the books. For 

 the former, Lunularia or some other genus may 

 be substituted if more convenient. 



III. Rhizoids of liverworts compared with those of mosses. 



IV. Structure of the mature sporocarp in the different 



families of liverworts. 



V. Comparison of the archegonia and antheridia of 

 liverworts and mosses. 



VI. Alternation of generations as seen in mosses and 

 liverworts compared with the ferns and other 

 vascular cryptogams. This will naturally be post- 

 poned until after the study of the latter groups.- 

 It will be found that in the ferns the oophytic 

 generation is reduced to a green prothallium, and 

 in the club-mosses and their allies a still further 

 reduction takes place. 



VII. Origin of the calyptra of mosses. 



