Mosses and Lichens 



The male organs (antkeridia) are borne in the axils of the 

 leaves of modified branches. 



The female organs (archegonia) are on the terminal branches. 



...TcUtt perianth. 

 .Mill. 



. -Telitti. 



.._(>?$ -C9U, 



! UtirS. 



Marchantia polymorpha. 



One leaf magnified to 

 show cell structure. 



Porella platyphylla. 

 Male branch. 



The spore-cases with their enveloping parts are terminal on 

 the branches; although they appear often to be on the sides 

 because a side branch has grown in the same direction and 

 beyond the main stem. 



JPeriatitlu 

 .Ytti. 



Veil 



.Vttl 



Female branch. Young Sporophyte. Sporophy te. 



Porella platyphylla. 



Beginning with the spore-case as a centre, and observing the 

 parts in order outward, a veil (calyptrd) may be found, and then 

 a perianth, and outside of all, several slightly modified leaves. 



Genus PORELLA, (L.) 



The Genus Porella is composed of large plants, dark-green 

 to yellowish-brown, usually 2 to 3 times feather-branched. 



The lobes of the leaves are very deeply two-parted; the dorsal 

 large, and roundish egg-shaped, usually entire, the ventral lobes 

 smaller, sometimes nearly separate from the dorsal, varying in 

 different species from ovate to lanceolate; underleaves large, 

 entire or toothed. 



100 



