Mosses and Lichens 



Pores (stomata) for the inlet and outlet of gases which serve 

 for food and respiration are found on certain parts of the 

 sporophyte of leafy mosses and not on the gametophyte ; they 

 are found on the sporophyte of ferns and not on the gametophyte 

 (prothallium). They are on the gametophyte and not on the 

 sporophyte of hepatics, (except in the Anthocerotacece). 



Fvnaria hygrometrica. A 

 pore from the spore-case 

 of the sporophyte. 



Hypnum Boxii. Sur- 

 face view of pore from 

 the sporophyte. 



Polytrichum juniperinum. Sur- 

 face view of a pore from the 

 spore-case of the sporophyte. 



Polytrichunt piliferum. Vertical 

 section through a pore. 



M. polymer pha, 

 Surface view of 

 pore. 



ct U. 



Marchantia polymorpha. Vertical section of a "plant" (gametophyte) through 

 a pore which leads into an air chamber. 



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