Pinna of mature Frond— under side. 



ASPIDIUM THELYPTEROIDES. 



SWARTZ. 



PLATE XXXT. A. VOL. VI. 



Aspidium novehoracense, 



" pumillum, 



Nephrodium tlielyp teroides, 

 JPolyjpodium novehoracense, 



Link, Swaetz. Willdenow. 

 schkuhr. kunze. 

 Of Gardens, 



MiCHAUX. 



Linnaeus. 



Aspidium — The Sliield Fern. 



Thelypteroides — ? 



In the Section Lastrea of Authors. 



The present species, although more dwarf in habit than 

 Aspidiwn thelypteris , still in all its characters it so nearly 

 approaches A. thelypteris of Swartz, and A. pumillum of Gar- 

 dens, that I have hesitated in placing it as distinct from that 

 species; the illustration, however, is given as a guide to the 

 cultivator. 



A North American Fern, and in all probability only a variety 

 of our British A. thelypteris. 



For a plant I am indebted to Mr. Sim, of Foot's Cray. 



There appear to be two forms in North America, the one 

 known as Lastrea novehoracense, and the other as L. thelypter- 

 oides; the former differs in a slight degree in having its creeping 

 VOL. YI. O 



