j$6 NATURAL HISTORY BULLETIN. 



Sp. Fil., vol. hi, p. 49; Hook, and Bak., Syn. Fil., p. 1S5; Hemsl., Biol. 



Cent. Am., vol. Ill, p. 627. 

 B. gracile Kaulf.,— Mett., Fil. Hort. Bot. Lip., p. 62; Hook., Sp. Fil., vol. 



in, p. 4S; Fourn., Sertum Nic, p. 258; Smith, Ferns, Brit, and For., p. 



198; Bak., Jour. Bot., vol. xxn, p. 362 (from Costa Rica.). 

 B. intermedium Link., — Kunze, Farrnk., p. 128, pl.LVii, fig. 2; Mett., Fil. 



Hort. Bot. Lip., p. 62; Lieb., Mex. Breg., p. 86; Hook., Sp. Fil., vol. in, 



p. 47 ; Smith, Ferns, Brit, and For., p. 198. 



The four fronds in the collection are nearest to the form 

 gracile, but in the size of the terminal pinna (3^2 to 4^ 

 inches in length), and in the almost total absence of serrations 

 on some of the pinnae they approach intermedium as described 

 by Hooker and figured by Kunze i^ibid.). 



Each of the specimens has three pairs of lateral pinnae. 

 These vary from ^ to 2 inches in length, and are sessile, or 

 very short-stalked. The stipes were flesh-colored when fresh, 

 drying to a light-brown color. 



Not common, growing on wet rocks below the lower falls 

 of the Deseado River at the eastern base of the Divide. 



Hemsley reports it from Chontales. 



Another form, vax.fraxineum, is reported from Costa Rica 

 by Baker 1 



2. B. OCCIDENTALE L. 



Linn., Syst. Nat., vol. 11, p. 688; Swz., Syn. Fil., p. 113; Presl, Rel. Haenk., 

 p. 49; Lieb., Mex. Breg., p. 86; Mett., Fil. Hort. Bot. Lip., p. 62, pi. in, 

 fig. 8; Eaton, Fil. Wr. et Fend., p. 204; Hook., Sp. Fil., vol. ill, p. 50; 

 Fourn., Bull. Soc. Bot. Fr., vol. xvn, p. 236; Fourn., Sertum Nic, p. 

 258; Hook, and Bak., Syn. Fil., p. 185; Smith, Ferns, Brit, and For., p. 

 197; Hemsl., Biol. Cent. Am., vol. n 1, p. 62S; Bak., Jour. Bot., vol. xxn, 

 p. 362 (from Costa Rica); Hitch., PI. Bah., p. 153. 

 B. aduncum Lieb., Mex. Breg., p. 85. 



Typical specimens of this species were rather common in 

 rocky soil at the base of the volcano Ometepe, and near the 

 foot of the hill on which old Ft. Castillo stands. A smaller 

 form with fronds % to i^( inches wide, with rachis hairy 

 beneath, and obtuse pinnae sometimes cuspidate, was found on 

 the Volcano Ometepe at an altitude of about 4,000 feet. 



Hemsley reports it from Chontales and Granada, and 

 Fournier from Chontales, Granada and Ometepe. 



1 Biol. Cent. Am., vol. IV, p. 116. 



