184 A TEXT-BOOK OF BOTANY 
(5) Appearance of leaves.—Among the Bryophytes very 
simple leaves are developed by the gametophyte, and the 
mosses produce leaves upon an erect stem. 
(6) Afany-celled sex-organs.—The many-celled antheridia 
and flask-shaped archegonia are very characteristic of Bryo- 
phytes, and distinguish even the thallose forms from any 
Thallophytes. 
107. General characters of Ferns.—The ferns are well- 
known plants, and the ordinary forms are easily recognized 
a 
ibis 
Fic. 176.—Shield ferns. 
(Fig. 176). In fact, the general appearance of the large 
compound leaves is so characteristic that when a leaf is said 
to be fern-like a particular appearance is suggested. Al- 
