Portion of a young Frond— upper side. 



GYMNOGRAMMA TARTAREA. Desyaux. Smith. Mooiie. 



PLATE 111. 



Gymnogramma tartareum^ 

 SemioniUs dealhata, 

 AcrosiicJium tartareum, 

 Ceropteris tartar ea, 

 Gymnogramma dealhata, 

 Gymnogramme tartarea, 



Katjlfuss. Willdeno'W, 



WlLLDENOW. 

 SWARTZ. 



Line. Fee. 



Oe some authors. 



Speengel. 



Gymnogramma — Naked writing. 



Tartarea — Infernal . 



The present Fern more nearly resembles Gymnogramma 

 calomelanos than any other species, the chief difference being 

 the form and position of the segments. It is a beautiful ever- 

 green stove species^ a native of Mexico, and of the warmer 

 portion of America. The fronds are sometimes three feet long, 

 usually about two feet; the colour of the upper side is a heavy 

 dull green, and beneath it is completely covered with a pure 

 snowy white farinose powder. The form of the frond is bi- 

 subtripinnate, having lanceolate-acuminate pinnules, and rounded 

 segments, which are distant, the lower ones being lobed. The 

 colour of the stipes, rachis, and the midrib of the pinnae is 

 black, and terminal, rising from an erect fasciculate rhizoma. 



The sori are linear medial, oblique, branched, and ultimately 

 become confluent. 



In a frond of three feet in length, the lower ten inches are 



