Mosses and Lichens 



which divides to form a stem or pedicel, while the second divides 

 to form the globular part of the antheridium. The mature 

 antheridium bursts at the apex, the margins roll back and a cloud 



...."JVC OSS -plo/nt" 

 Lj?T atone wo. 



Sphagnum acutifolium. 

 Male flower-cluster with 

 sterile branch at base. 



Moss plant on protonema of Sphagnum acutifolium. 



of flattened membranous sacs (vesicles), each containing one 

 spirally coiled antherosoid, are thrown out. The antherosoids 

 are soon set free by the breaking down of the vesicle wall. 

 Each antherosoid is a spirally coiled cell, club-shaped, with two 



/"~\ vibratile lashes at the 



attenuated end. 



Sphagnum 

 subsecundum. 

 Young arche- 

 gonium. 



Sphagnum 

 papillosum. 



Vertical sec- Sphagnum cuspida- 



tion of a de- turn. Vertical section 



veloping of a ripe archegonium 



archegonium. to show egg-cell. 



Sphagnum cuspidatum. Vertical 

 section to show young embryo. 



Archegonium, The archegonium is developed by cell-division; 

 it is similar to a tiny flask, at the base of which is an egg-cell 

 (ovum) which, after fertilisation, is to become a spore-case (i, 2, 3). 



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