GARPOPHTTA. 173 



gone {B, I, Fig. 95) is thickened below, and elongated 

 above into the trichogyne, which differs from that in 

 Ooleochsete in not being open at the top. 



310. When the antherozoids are set free from the anther- 

 ids, they attach themselves to the trichogyne, as shown in 

 Fig. 95. The result of this contact of the antherozoids 

 with the trichogyne is the fertilization of the carpogone, 

 which immediately enlarges and at the same time under- 

 goes division into many cells, which grow into short, 

 crowded branches, bearing a spore at the end of each (D and 

 E, Fig. 95). This growth, which includes the spores and 

 the short branches which bear them, and which resulted 

 from the fertilization of the carpogone, is the spore-fruit 

 {sporocarp) of these plants. In the genus under consider- 

 ation the spore-fruit is a comparatively simple growth, as 

 compared with the degree of complexity it reaches in some 

 other orders of this class. 



311. In some other cases (Lejolisia, etc.) the carpo- 

 gone, before fertilization, consists of several cells {A, I, Fig. 

 96). Upon fertilization taking place the outer cells of 

 the carpogone divide, and develop into articulated branches 

 which lie side by side and form a more or less spherical en- 

 velope, the so-called "pericarp." In the mean time the 

 central cell of the carpogone produces outgrowths or short 

 branches which eventually bear spores, occupying the cavity 

 of the pericarp {A, s, Fig. 95). The spore-fruit here con- 

 sists of a fertile part which bears spores, and a sterile part 

 which serves as a protection or covering. In technical 

 works the spore-fruit is called a "cystocarp." 



Practical Studies. — The Bed Seaweeds include about 2000 species, 

 all falling within the single order (11) Flokidb/e. There are many 

 families, but it is unnecessary to notice them here particularly. 



