Fig. 5.— Portion of mature Frond— under side. 



POLYPODIUM ROBERTIANUM. 



Hoffmann. 



The Limestone Polypody. 



PLATE V. 



Polypodium Moberiianum, 

 « << 



" calcareum. 



" dryopteris, var., 



Phegopteris calcarea, 

 Gymnocarpium Sobertianum, 

 Lastrea calcarea, 



" Pobertiana, 

 Nephrodium dryopteris. 



Hoffmann. Mooee. 



LiSDLET AND MoOBE. 



Smith. Hooker and Abnott. 

 Babington. Deakin. Newman. 



SoWEEBT. PeESL. "NTiLLDENOW. 



Sprengel. 



A. Gbay. Bolton. 



Fee. 



Newman. 



BoBY. Newman. 



Newman. 



MiCHAUX. 



Polypodium — From the Greek polys — many, and pous — a foot, 

 in allusion to the branching rhizoma. Robertianum — Named after 



a botanist. 



The present species bears considerable resemblance to the 

 Polypodium dryopteris, but is readily distinguished by its more 

 robust growth, and by the powdery-looking fronds. It is 

 confined to the limestone districts, and very local. A hardy 



