6 6 6 6 6 



Fig. 128 Scinaia furcellata. A, carpogonial branch ( x 700). B, 

 fertilized carpogonium. C, cystocarp ( x 195). D, plant ( x ^). E, 

 antheridia ( x 700). F, young carpogonial branch ( x 425). G, young 

 cystocarp ( x 232). H, undifferentiated threads at apex of thallus 

 ( X 425). I, monospores and a hair ( x 340). J, differentiated cortex 

 ( X429). K, life-cycle diagram. (C, after Setchell; D, original; rest 



after Svedelius.) 



monoecious, although one may find monospores and spermatia on 

 the same plant. The fronds, which arise from a discoid holdfast, 

 are subgelatinous, cyhndrical or compressed and dichotomously 

 branched. The centre of the thallus is composed of both coarse and 

 fine colourless filaments, the former arising from the apical cell and 

 the latter from the corticating threads. There is also a peripheral 

 zone of horizontal filaments that terminate in short corymbs of 



232 



