STRUCTURE. 
11 
veloped from the spore, and bears the parts through which 
fertilisation takes place ; the other, which results from 
this latter act, being of a totally different form, pro- 
ducing stems, and leaves, and spores. 
The facts from which these inferences are drawn have 
been variously, and even conflictingly, stated by different 
observers. Suminski, who seems in great measure to 
have revived the inquiry, states that the spore first pro- 
duces a filamentous process, in the end of which cell- 
development goes on until it is converted into a small 
Fig. 6. Germinal frond ; a, ovules; b, antheridia; c, root-fibrils, 
leafy scale, of very delicate texture, possessing hair-like 
radicles on its lower surface. From this lower sur- 
face become developed in variable numbers cellular organs 
