60 LESSER ADDER'S TONGUE. 



flowerpot, well covered with a composition of silver 

 sand, peat earth, and loam, resembling mortar, the 

 flowerpot being first filled with wet sphagnum, and 

 mounted into a saucer, likewise filled with sphagnum. 

 The luxuriant growth of the fern is almost certain in 

 this way. Both these ferns are very suitable for 

 closed cases, and do well in them ; but we are advised 

 by those who have tried the experiment, to have two 

 small apertures near the top of the glass shade, so 

 as to prevent any retention of stagnant moisture. 

 Mr. Clowes, whose culture of these ferns has been very 

 successful, says that he has observed that the fronds 

 of H. tunbridgense are strictly annual, never growing 

 for more than one year, while those of H. Wilsoni 

 go on growing year after year. 



LESSER ADDER'S TONGUE. 

 OPHIOGL OSS UM L USITA NIC UM. 



OPHIOGLOSSUM LUSITANICUM is a small variety of 

 the former species, not exceeding two or three inches 

 in height, the tiny spike arising from its bright green 

 leaves in the same manner. It may be recognized by 

 its narrower frond and thicker (more fleshy) texture. 

 The only British locality in which it has been found 



