CHAPTER XV. 



OTHER CRYPTOGAMS IN CULTIVATION. 



I HE structure and cultivation of ferns alone 

 have thus far been discussed, except that 

 in Chapter II. sufficient mention has been 

 made of other plants to indicate the place of ferns 

 in a general system of classification. Even now 

 we can only speak briefly of such other Crypto- 

 gams as are or may be cultivated, dismissing with 

 a word the rest which cannot be taken from their 

 native habitats. 



If we turn to the table at p. 18 we may com- 

 mence with the lowest groups, and follow up the 

 arrangement to the Lycopods, the highest of all 

 cryptogamous plants. 



The Algcz are a very important family in nature, 

 but, outside of a few aquaria, are seldom met with 

 in cultivation. The smaller marine species are 

 much sought for to arrange in collections of taste 

 and to study scientifically ; and the Diatoms, among 



the humblest of plants, are the subject of profound 



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