424 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 





Spores or nucules soli- 

 tary. I 



Spores numerous, giving 

 rise to a plant which pro- 

 duces one or more succes- 

 sive sets of fructifying 

 archegouia. 



Spores numerous, pro- 

 ducing a prothallus which 

 bears a single set of arche- 

 gonia, which yield fructify- 

 ing plants. 



CharacecB. 



Ricciacece. — Sporangia 

 valveless with- 

 out elaters. 



Marchantiaeeoe. — Sporan- 

 gia dependent, 

 valvate or 



bursting irreg- 

 ularly. Spores 

 mixed with 

 elaters. 



Jungermanniaceoe. — Spo- 

 rangia erect, 

 valvate. Spores 

 mixed with 

 elaters. 



Musci. — Sporangia valve- 

 less, operci;late, 

 without elaters- 



Filices. — Sporangia annu- 

 late, or rarely 

 exannulate and 

 closelycrowded 



Ophioglossacece. — Sporan- 

 gia exannulate, 

 bivalvate. 



Equisetacece. — Sporangia 

 dependent, uni- 

 locular, burst- 

 ing laterally. 



Mccrsileacece.l — Sporangia 

 multilocular. 



Lycopodiacece. — Sporangia 

 axillary, unilo- 

 cular. 



