JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE IX, 



Illustrating Mr. Vines^ Paper on Recent Researches into 

 the Nature of Lichens. 



Fig. 1. — A portion of the hymenium of Endocarpon pusillum. To the 

 left, an ascus with as yet undivided contents ; next to it, one 

 with two ripe spores ; still more to the right, an empty ascus. 

 The interspaces are filled with spherical hymenial gonidia. ^^. 



Fig. 2. — Two recently extruded spores with attached hymenial goni- 

 dia. ^s., 



Fig. 3. — The hymenial gonidia have, in consequence of their investment 

 by the hyphae, increased in size, as a comparison of them with 

 the free gonidia at once shows. At a, two Pleurococcus 

 colonies derived each from a single hymenia gonidium. ■^-^. 



Fig. 4. — A young thallus from a culture on porous earthenware, with two 

 spores still attached. The mass of gonidia is invested by a 

 layer of cells. ^^. 



Fig. 5. — Two young thalli of Endocarpon five months old, cultivated on 

 earthenware, f. 



