370 



ORGANOGRAPHY. 



structures, called antheridia and archegoniay which are now 

 considered as the organs of reproduction. The antheridia are 



Fig. 783. 



Fig. 784. 



^ig. 783. Sporangia of a Fern ( J/ar- 

 ginaria verrucosa), s. Sporan- 

 gium, supported on a stalk, 7^, and 

 surrounded by a ring or annulus, 

 -which is a continuation of the 

 stalk. One sporangium is repre- 

 sented as burst on one side, and 



the spores in the act of being scattered. Fig- 784. Germinating spore of a 



species of Fern. a. Spore, p. Pro-thallus. r. Radical fibre. 



Stalked cellular bodies (^fig. 785), containing other minute cells 

 called sperm-cells, se, in which are developed spiral ciliated 

 filaments, sp, termed spermatozoids or phytozoa. The archegonia 

 or ovule-like bodies {fig. 786) are little cellular papillse of a 

 somewhat oval form, with a canal in the centre leading to a cell 

 called the germ-cell or embryo-cell, and which is contained in 



Fig. 785. 



Fig. 786. 





Fig. 7M. Side view of an antheridium containinp a number of itperm-cells, se. 

 ip. Spcrmatozouh escaping from the antheridium after having burst the 



■perm-celU. After Ilenfrey Fig. 786. Vertical section of an archegonium, 



pMiiug tltiough the caual and embryo-sac. After Ueufrey. 



