226 



ESSENTIALS OF BOTANY 



felt-like masses which it forms. It must not be confused 

 with moss protonema (Fig. 199) which also grows on 

 damp earth. The protonema has many cross-partitions in 

 the filaments (often oblique in position) and lacks other 



Fig. 157. Vaucheria synandra. 



A, a filament with archegonia and antheridia (considerably magni- 

 fied) ; iJ, part of same much more highly magnified ; o, oogonium; 

 a, antheridium ; C, a later stage of B; D, end of a filament with 

 a zoospore, z, escaping (liighly magnified) . 



characteristics shown in Fig. 157, A. It will also usually 

 be found to be developing young moss plants. 



290. Gross Structure. — Place in a white saucer or a watch glass 

 with very little water some bits of earth on which Vaucheria is grow- 

 ing. Have other specimens growing in water in a sunny place, 

 where they should have remained undisturbed for a week or more, 



