358 PHARMACEUTICAL BOTANY 
tive tissue. Several rounded or flattened chromatophores occur 
in each cell. 
Reproduction may be accomplished vegetatively by frag- 
mentation and by budding. Asexual reproduction is commonly 
by means of ¢etraspores which are formed in tetrasporangia that 
occur on the ends of lateral filaments or in subepidermal cells. 
Pra : 
a4 
par 
an 
Fic. 262.—Fucus vesiculosus. ‘Transverse section through outer region of a portion 
of the receptacle of male plant showing a male or antheridial conceptacle and 
adjacent tissues. X 50. an, antheridium; os, ostiam or opening of conceptacle 
through which paraphyses are seen protruding; far, paraphyses protruding from 
another conceptacle, the latter concealed by surrounding tissue; b, compact pseudo- 
parenchyma; fs, loose pseudoparenchyma with mucilaginous cells: 
Sexual reproduction is by union of the nuclei of Spermatia and ova. 
The female sexual organ is called a carpogonium, the male sexual 
organ an anthertdium. The carpogonium consists of a basal cell 
which contains the ovum and a terminal filament which ends 
in a hair-like portion called the trichogyne. The contents of each 
mature antheridium as it emerges from the organ is termed a 
spermatium. It is a spherical, non-motile male cell. The sper- 
matia cling to the trichogyne and the nucleus of a spermatium 
