i68 



MUSCINE^ 



stomates belong; (2) a close tissue containing but little chlorophyll, and 

 with the cell-walls pitted or reticulately thickened, without intercellular 

 spaces but sometimes containing mucilage-receptacles ; and (3) a ventral 



Fig. 153. — A, transverse section through middle portion of thallus of M. polyjnor^ha (x 30); B, 

 through marginal portion (more highly magnified), p, colourless layer without intercellular spaces 

 o, epiderm of upper side ; chl, chlorophyllous layer ; sp, stomate ; s, partition-walls between air- 

 chambers ; 21, lower epiderm ; h, rhizoids b, leaf -like lamellae. (After Goebel.) 



Fig. 154. — Portion of young receptacle of M. polymorpha. A, vertical section; <?, epiderm; sp, 

 stomate ; >S', partition-wall separating air-chamber from chlorophyllous cells ; g, mucilage-cell. B, 

 C, young stomate ; po, pore. (After Goebel.) 



epidermal layer, from which spring rhizoids and leaf-like lamellae. The 

 mucilage-passages are especially developed in Fegatella (Radd.) and 



