Fig. 10. Brown algae: young plants illustrating filamentous 

 and axial development 

 A, B, Tilopteris mertensii. Germlings from monospores (after Sauvageau). C, D, 

 Dict'vosiphon foeniculaceus. Germlings from zoospores (after Sauvageau). E, 

 Cladostephus verticillatus; d, disc; /, filament of limited growth; h, hair (after 

 Sauvageau) ; F-H, Desmarestia aculeata. Embryos at different stages of develop- 

 ment; e, erect axis; r, rhizoid, g, gametophyte (after Schreiber); J, Dictyota 

 dichotoma. Young plant, with apical cell (after Cohn). 



