DOEYOPTEEIS DBYMOGLOSSTJM. 



47 



margin, and in a continued line, and by the reticulation of the 

 veins. The species are all of a dwarf habit, and are, therefore, 

 proper to cultivate in small collections. 



DOEYOPTEEIS COLLINA (Hill).- A Brazilian Fern, growing 

 not more than 10 inches high, with leathery, palmate, bright 

 green fronds. The sterile ones are sometimes thrice, and 

 sometimes five times parted ; the fertile ones are always five- 

 parted, or spread out in five divisions like a man's hand. It is 

 an elegant species, and somewhat rare. 



D. PALMATA (Hand-shaped). Differs from the preceding 

 species by being taller, and by the lobes of each frond having 

 more divisions, so as to be almost 

 pinnated. The sterile fronds also 

 are almost simple when young. It 

 is very beautiful, easily grown, and 

 increased by division. 



D. SAGITTIFOLIA (Arrow- 

 headed), Fig. 23. A Brazilian Fern 

 of great beauty. The fronds are 

 simple, acute, nearly a foot high, 

 almost all spore-bearing stems black 

 and smooth. Increases readily by 

 division. This species is very dis- 

 tinct, very elegant, and ought to be 

 in every collection however small. 



DRYMOGLOSSUM. 

 A genus of low, creeping, curious 



Fig. 23. Deryopteris Eagittifolia. _, , ,. , , , -I./T -n i 



(Part of medium-sized irond.) Ferns, established by M. Presl. 

 The essential characters by which 



it may be known are an irregular compound of the veins, and 

 the position of the spore-masses, which are placed on each 

 margin in a continuous line on the upper part of the fertile 

 fronds. 



