3G6 COTANT. 



be still regarded as portions of the general surface, and the 

 cells -which form the inner surface of the conceptacles con- 

 stitute a continuation of the epidermal tissue of the thallus. 

 353.— The walls of the conceptacles are clothed with 

 pointed hairs, which in some species project through the 



Fig. ■m.—Fmueplatycarpus. A, enfl of a portion of thalluB ; /,/, conceptacles to 

 fertire branchlets. B, vertical eection through a ronceptacle ; o, hHirs projecUng 

 from the mouth ; b, cavity of conceptacle nearly filled with hairs ; e, oogonia ; e, an- 

 theridia ; rf, epidermal tissue of tliallus. — After Thuret. 



opening, and among these are found the sexual organs, 

 which are themselves, as Sachs has pointed out, modified 

 hairs. Some of the species are monoecious, while others are 

 dicEcious. In the monoecious species the antheridia and 

 oogonia occupy the same conceptacle {B, Fig. 181) ; the 

 antheridia are produced as lateral branches of modified hairs 



