300 



HALF-HOURS IN THE GREEN LANES. 



identification. In the genus Andrea there is no 

 lid, and the spores have therefore to make their 

 escape by the capsule splitting into four parts 

 (Fig. 239). In those mosses whose capsules are 

 covered with lids, there is frequently a contractile 



Fig. 233. Fig. 234. 



Young Fruit of Orthotri- 

 chwn crispum, showing 

 Vaginula and hairy 

 Calyptra. 



Mitriform Calyptra of 

 Encalyptra. 



ring of cells interposed between the lid and mouth 

 of the capsules, called the annulus, or " ring." 

 Fig. 240 shows the different internal parts of a not 

 uncommon species of moss (Mnium hornuni), and 

 from this the student will gain a good idea of the 

 general structure When the capsule lid of & moss 



