INTRODUCTION TO CRYPTOGAMIC BOTANY. 



441 



upper and under side, as if it were a prolongation of the 

 frond. 



486. The male fruit is borne on distinct pedunculate or sessile 

 processes, often resembling more or less the female receptacles. 

 The antheridia are immersed in their substance exactly as the 



Fig. 92. 



a. Dumortieria trichocephala. From a sketch in the Hookerian 

 Herb. 



h. Eeceptacle with the fissured perianth of Fimhriaria fragrans. 

 From Hook. Herb. Slightly magnified. 



c. Marchantia che7iopoda, from St. Vincent's. From Hook. Herb. 



d. Marchantia polyniorplM. Young sporangium still involved in the 

 archegonium, with part of the proper involucre, or perianth reflected at 

 the base. Slightly magnified. 



e. Mother cells, and young elater from the same. More highly mag- 

 nified. 



/. Stomate. * 



perithecia are in Poronia punctata, a Fungus which is com- 

 mon on the dung of animals in most parts of the world, in one 

 or other of its forms. The sperniatozoids resemble those of 

 Targionia (Fig. 91,/). The cuticle of the frond is areolate 

 and porous. The pores, however, are not precisely homolo- 

 gous with the stomates of Phsenogams, though then- functions 

 are the same. There is a distinct midrib, from the under side 



