172 



MORPHOLOGY, 



and ihcy arise as branches from a sterile filamentous-branched, Chantransia- 

 like form. 



375. Fertilization in the lower red algae. — The sexual organs in the red 

 alg:e consist of antheridia and carpogonia. The antheridia are usually 

 borne in crowded clusters, or surfaces, and bear terminaUv the small non- 

 motile sperm cells. The carpogonium is a branch of one or several cells, 

 the terminal cell (procarp) extending into a long slender process, the tri_ 

 chogyne. The sperm cell comes in contact with the trichogyne, and in the 

 case of Nemalion and some others the nucleus has been found to pass down 

 the inside and fuse with the nucleus of the procarp. 



From this point in the lower red algas like Nemalion, Batrachospermum 



A, part C)t a shuot showinj^ whnrls uf branches with clusters ol carpospores. 

 B, carpogonic branch ur procarp. c. pri.icarj) cell, ir. trichogyne. C same with 

 sperm (5/?) uniting with trichogyne. l>, same with carpospores developing from 

 procarp cell. E, male branch \vil h Muc-crllcd anthcri(.Ha. /■", same with soiiu' of 

 anthendia cmiit \ . (After Schmitz. ) 



and Lemanea the formation of the spores is \ery simple. The procarp is 

 stimulated to growth, and buds in dilk-rent direitions, producing branched 

 chains of spores (carposjjores). The carin)S[K.tres form a radu'r i i.>!npat t 



