56 



MOSSES AND FERNS 



CHAP. 



branch. Upon its ventral surface it shows a furrow in which 

 root -hairs are produced in great numbers, and this furrow 



A. 



B. 



D 



Fig. 19. — Fimhriaria Cali/ornica (Hampe). A, Plant with two fully-grown sporogonial receptacles, 

 natural size ; B, a single receptacle, X 4 ; C, the same cut longitudinally, showing the sporogonium 

 {sp), enclosed in the perianth (J>er) ; D, nearly median section of a young receptacle showing one 

 growing point {x) and an archegonium {ar) ; L, air-spaces ; st, a pore ; r, rhizoids, X 40 ; E, 

 the growing point of the same with an archegonium, X 300 ; x, the apical cell. 



passes over into the ventral surface of the thallus (Fig. 

 19, B). 



