Mosses and Lichens 



CALYPTRA 



The calyptra or veil is the dry remains of the outer wall of 

 the archegonium in which first the egg-cell and then 

 the embryo moss-plant were developed, for as the em- 

 bryo within enlarges, the wall of the archegonium sooner 



Funaria hygrometrica. 

 Young sporogonium still 

 covered with its veil. 



Encalypta ciliata. Old 

 sporogonium with fringed 

 and transparent veil. 



Two developing sporogonia 

 with five shrivelled arche- 

 gonia at their base. The 

 figure on the left shows the 

 archegonium wall severed 

 from its base thus disclosing 

 the pedicel of the spore-case 

 within. 



Pogonatum brachy- 

 phylluin. Spore-case 

 with hairy veil. 



or later ruptures near the base, 

 and is carried up by the grow- 

 ing spore-case. This severed 

 archegonium wall may be thin 

 and smooth and often split up 

 one side, or it may be as in the 

 Hairy-caps rough with hairs, 

 caused by the stretching and 

 ultimate rupturing of the fibres 

 which composed the tissue of 

 the walls. 



50 



Tetradontium 

 repanditm. Spore- 

 case with conical 

 veil. 



