110 CHARACTERS OF TRIBES AND GENERA. 



forming nearly equal quadrangular areoles. Fertile pinnae 

 contracted linear, sinuously moniliform, 8 to 10 inches 

 long. Receptacles compital, solitary on each lobule, forming 

 a row of punctiform sori on each side of the mid-rib. 



Type. A. Meyeniana, Schott. 



Illust. Schott. Gen. Fil., t. 19 ; Hook, and Bauer, Gen. 

 Fil., t. 91 ; Moore, Ind., p. 63, B. 



OBS. This genus is founded on a remarkable and very 

 splendid Fern, possessing the general habit of Drynaria 

 coronans, but differing in the upper half of the frond being 

 contracted into narrow sinuose pinnae, and bearing a round 

 sorus on each lobule, which latter character distinguishes 

 it from Dryostachyum. It is also a native of Luzon. 



Species. A. Meyeniana, Schott. 



Since the publication of " Ferns, British and Foreign," 

 this rare and remarkable Fern has been introduced in a 

 living state to the gardens of this country. 



25. ARTHROMERIS, /. Sm. 



Pleopletis, sect. Artliromeris, Moore's Index ; Polypodium sp., 

 auct. and Hook. sp. Fil. ; Pleuridium sp., J. 8m. Ferns, Brit, 

 and For. 



Surculum short and thick. Fronds pinnate, stipitate, 

 2 to 3 feet long. Pinnce elliptical, lanceolate, 6 to 8 inches 

 long, 1 to 2 inches wide ; opposite petiole short, articulated 

 with the rachis ; margin entire, with a narrow membra- 

 neous border. Primary veins evident, costaeform, straight ; 

 venules compound anastomosing. Receptacles punctiform, 

 compital. Sori transverse, 1 or 3 to 5 serial. 



Type. Polypodium juglandifolium, Don. 



OBS. In my Catalogue of Cultivated Ferns, and also in 

 "Ferns British and Foreign," I placed the two known 

 species that constitute this genus under Pluridium, but 



