CHAPTER XXI 
TYPES OF CRYPTOGAMS; BRYOPHYTES 
334. The Group Bryophytes.— Under this head are 
classed the liverworts and the mosses. Both of these 
' classes consist of plants a good deal more highly organized 
than the thallophytes. 
Bryophytes have no 
true roots, but they 
have organs which 
perform the work of 
roots. Some of them 
have leaves (Fig. 206), 
while others have 
none (Fig. 201). 
Fibro-vascular bun- 
dlesare wanting. The 4 
physiological division GS 
of labor is carried 
pretty far among all 
the bryophytes. They 
have special appara- 
tus for a b sor b in e Fig. 201. — Part of Male Thallus of a Liverwort 
water and sometimes (Marchantia disjuncta). (Enlarged.) 
; ae conducting a mr, male receptacle. } 
through the stem; stomata are often present and some- 
times highly developed. There are chlorophyll bodies, 
often arranged in cells extremely well situated for acting 
277 
