l6o NATURAL HISTORY BULLETIN. 



Ferns S. Ind., p. 47, pi. cxxxvii; Hook, and Bak., Syn. Fil., p. 208; 

 Smith, Ferns, Br. and For., p. 217; Ilemsl., Biol. Cent. Am., vol. in, p. 

 630; Bak., Biol. Cent. Am., vol. iv, p. 362 (from Costa Rica). 

 A. monodon Lieb., Mex. Breg., p. 96. 



The specimens are typical according to Hooker {ibid.'). 



The pinnae vary from almost entire to deeply serrate with 

 or without auricle, and the rachis is very narrowly winged. 

 The stipe is often almost black near the base and gradually 

 changes to green upward. The rachis is green, sometimes 

 blackish below. 



Common in rather open woods (a partial clearing) near 

 Castillo growing both on tree-trunks and on the ground. 

 Also found along the Deseado River near Camp Menocal, on 

 tree-trunks. 



New to the Nicaraguan list. 



7. A. formosum Willd. PI. xiv, Figs. 9, 10. 



Presl, Rel. Haenk., p. 44: Lieb., Mex. Breg., p. 89; Hook., Fil. Ex., pi. XVI 

 Mett., Ub. Ein. Farng., pt. vi, p. 134; Eaton, Fil. Wr. et Fend., p. 205 

 Hook., Sp. Fil., vol. in, p. [43; Fourn., Bull. Soc. Bot. Fr., vol. xvn, p 

 236; Hook, and Bak., Syn. Fil., p. 210; Smith, Ferns, Brit, and For., p 

 212; Fourn., Sertum Nic, p. 257: Hemsl., Biol. Cent. Am., vol. in, p 

 633; Bak., Jour. Bot., vol. xxn, p. 362. 

 A. subalaium II. and A., — Fourn., Sertum Nic, p. 257 (from Granada). 



Nearly typical, but rather narrow, and with very few speci- 

 mens showing sori on the upper side of the midrib. 



Found sparingly on rocky banks near the foot of the vol- 

 cano Ometepe, and along the Los Sabalos River. 



Reported from Chontales and Granada by Fournier and 

 Hemslev. 



8. A. l.etum Sivartz. PI. xv, Figs. 1-5. 



Swz., Syn. Fil., pp. 79, 271 ; Eaton, Fil. Wr. et Fend., p. 205; Hook., Sp. Fil., 

 vol. in, p. 133, pi. clxxiii; Roth., Les Foug., vol. 11, p. 118, pi. xlvi; 

 Hook, and Bak., Syn. Fil., p. 210; Hemsl., Biol. Cent. Am., vol. Ill, p. 

 635- 

 A. sc'ikithfi I'litm Presl, Tent. Pter., p. 137. 



Great confusion exists in the synonymy of this species. 

 Hooker {ibid.) says: " We have, unfortunately, no means of 



