Mosses and Lichens 



different plants (dioicous, two households). This 

 plan is common to many species of mosses, while 

 other species have the antheridia 

 and archegonia on the same plant 

 (monoicous, one household). 



JftauU. ctttJtcr of 



ale cluster 

 of first jj 



Terminal male 

 Female plant. Male plant. flower-cluster. 



Polytrichum. Dioicous inflorescence. 



Sperm cell. 



Antheridium bursting and sending 

 forth sperm cells. (See page 46.) 



Phascum cuspidatunt. Paroicous inflores- 

 cence. Vertical section through stem to 

 show (an) male and (ar) female flowers side 

 by side on the same plant. (6) Leaf 

 blades, (p) Paraphyses. 



Trematodon ambiguum. Examples of 

 autoicous inflorescence. Two male 

 clusters and one female cluster. 



40 



