8 CELLULAR AND VASCULAR PLANTS, 
approach more or less closely to the spherical or oval form, or if 
elongated are thin-walled and commonly flexible, they are also 
Fic. 9. Fia. 10. 
Fig.7. A portion of the flat thallus-like stem of Marchantia polymorpha, 
showing an antheridial receptacle, 7, supported on a stalk, s.——Fig. 8. 
Jungermannia bidentata. The stem is creeping, and bears numerous 
small imbricated leavyes.——Fig. 9. Female plant of the Hair-moss 
(Polytrichum commune), with its leaves, stem, and fructification.— Fig. 
10. The male plant of the same, with its stem and leaves, and terminated 
by the male organs (aéntheridia). 
termed Cellular Plants, in contradistinction to those above 
them in order of development, which are called Vascular Plaits, 
on account of their commonly possessing, in addition to these 
