252 



SEEDLESS PLANTS 



except for their color, met with 

 everywhere on wet rocks and 

 banks around shady water courses. 



Mosses are one of the best de- 

 fined of botanical orders, and are 

 too well known 

 to need further 

 specification 

 here. 



Bryophytes 

 form a connect- 

 ing link, or rath- 



475. — Scapania, a liverwort gj- g. chain of 

 with leafy thallus, approaching . 



the form of mosses and lyco- Connecting links 



podiums (from COULTER'S between the next 



" Plant Structures "). 



group, pterido- 

 phytes, and thallophytes. The liverworts 

 represent the more 

 primitive division of 

 the group, and in some 

 of their forms ap- 

 proach so near the 

 thallophytes that it 

 does not take a bot- 

 anist to recognize the 

 relationship. 



477. — A common fern 

 {Polypodium vulgare) . 



359. III. Pterido- 



phytes, or fern plants, 

 include the three divi- 

 sions of ferns, horse- 

 tails, and club mosses. 

 They differ greatly in 

 structure, but all pos- 

 sess a vascular sys- 

 tem, a well-organized 

 stem, and leaves, and 

 spermatophytes in the 



476. — A coirunon 

 moss plant, with parts 

 apparently divided into 

 root, stem, and leaves, 

 but with no true dif- 

 ferentiation of tis- 

 sues (from Coulter's 

 " Plant Structures "). 



system of root, 

 rank next to the 

 order of develop- 



