no 



MOSSES AND FERNS 



CHAP. 



Among the other remarkable forms is Lejeunia metsgeriopsis, a 

 Javanese species discovered by Goebel growing upon the leaves 

 of various epiphytic Ferns. It has a thallus much like that of 

 Metzgeria, and like it has a two-sided apical cell. This thallus 

 branches extensively (Fig. 52, A), and propagates itself by 



Fig. 52. — A, Lcjeicnia metzgeriopsis (Goebel), showing the thalloid protonema with terminal leafy 

 buds (U), X 14 (after Goebel). B, Gemma of Cvlolejcunia Goebelii. 



numerous multicellular gemmae. This thallose condition is, 

 however, only maintained during its vegetative existence. 

 Previous to the formation of the sexual organs, the two-sided 

 apical cell of a branch becomes three-sided, as in the young 

 plant of other species of Lejeunia^ and from this three-sided 



