72 



middle of the assimilating filaments (Fig. 72). Besides the car- 

 pogonial cell with the trichogyne it consists most commonly of 

 4 cells (Fig. 75 6), sometimes of 3 only. The branch is compara- 

 tively thick, the diameter reaching often a length of 22//. After 

 fecundation the carpogonial cell is divided by a transverse wall 

 into two cells from the uppermost of which the sp erogenous fila- 

 ments grow out (Fig. 75 a), while the lowest remain undivided. 



The cystocarp (Fig. 

 75 c) is a comparatively 

 large spherical body 

 which reaches often more 

 than 400 [j. in diameter. 

 It consists of thin sporo- 

 genous filaments (lat. 

 about 8//); these are 

 ramified, more or less 

 woven together and 

 composed of rather long 



nearly subcvlindrical O r 

 Fig. <3. Liagora valida Harv. a, assimila- J 



ting filament (comp. the text), b, Part of a more irregularly shaped 

 filament showing shape of the cells, (a, about cells At the end of the 

 60 : 1; b, about 160: 1). 



filaments the carpospores 



are produced (Figs. 75 d, e)\ these reach a length of about 10^ 

 while their diameter is about 5 6^, After the fertilization of 

 the carpogonium several ramified filaments arise from the cell 

 below that upon which the carpogonial filament is inserted. 

 These pericarpic filaments consist of thicker, 

 oval, often nearly spherical, sometimes also 

 more irregularly shaped cells ; they grow up- 

 wards around the cystocarp. Furthermore from 

 the basal part of these cells and also from the 

 sporogenous filaments thin hair-like filaments 

 grow downwards often in great numbers (Fig. 

 75 c). 



The antheridia I have not found in my material ; on the 

 other hand they were present abundantly in a specimen from 

 Key West, (FARLOW, ANDERSSON & EATON, Alg. Am. Bor. exsicc., 

 no. 70) in Herb. J. AGARDH in Lund. The antheridia are found 

 on the summits of the assimilating filaments whose uppermost 

 cells are divided into thin filaments in the end cells of which 

 the spermatia are developed. 



? 











Fig. 74. Liagora va- 

 lida Hary. Trans- 

 verse section of the 

 medullary tissue. 

 (About 60: 1). 



