200 ALGyE 



phore, the function of which is to convey the fertilising substance from 

 the trichogyne to the carpogone. The procarp is usually formed on the 

 youngest parts of the plant, and often originates from the terminal cell 

 of a lateral branch. Occasionally each carpogone has two trichogynes 

 and two trichophores ; or, again, each trichophore may be connected 

 ^vith two carpogones. The trichogyne often becomes eventually coiled 



Fig. 177. — Lejolisia mediterranea Born, a, filament with tetrasporange ; b^ plant 

 with cystocarps and antherids ; c, empty cystocarp ( x 150). (After Bomet.) 



spirally at its base. It does not open to admit the entrance of the 

 pollinoids ; in the act of impregnation these bodies attach themselves 

 to a spot near the apex of the trichogyne, and at the same time clothe 

 themselves with a cell-wall. At the point of contact the cell-wall of both 

 trichogyne and pollinoid is absorbed ; the contents of the latter pass 

 through the trichogyne and the trichophore to the carpogone, impregnat- 



