!^S NATURAL HISTORY BULLETIN. 



7. A. villosum L. PI. ix, Figs. 6-1 1. 



Linn., Syst. Nat., vol. II, p. 695; Swz., Syn. Fil., p. 124; Lieb., Mex. Breg.,. 

 p. 112; Hook., Sp. Fil., vol. 11, p. 18; Eaton, Fil. Wr. et Fend., p. 202; 

 Hook, and Bak., Syn. Fil., p. 122; Smith, Ferns, Brit, and For., p. 183; 

 Fourn., Sertum Nic, p. 259: Hemsl., Biol. Cent. Am., vol. hi, p. 612- 

 Hitch., PI. Bah., p. 152. 



A. acuminatum Dcsv., — Fourn., Sertum Nic, p. 259 (placed here on 

 authority of Hemsl., Biol. Cent. Am., vol. in, p. 612). 



A. oblique-truncatum Fee, — Fourn., Sertum Nic, p. 259 (placed here by 

 Bak. in Hook, and Bak., Syn., Fil., p. 122, and doubtfully by Hemsley 

 in Biol. Cent. Am., vol. ill, p. 612). 



The more common form of this species has the frond and 

 stipe each usually less than one foot in length, and pinnules 

 with the lower and outer margins forming a more or less con- 

 tinuous curve. The frond is loose in structure, the pinnules 

 being more or less remote, and there are usually two or three 

 lateral pinnae on each side. This passes gradually into a 

 larger form with frond and stipe each a foot or more in length, 

 with lateral pinnae in five or six pairs, the pinnules more 

 closely crowded and the lower and outer margins straight and 

 forming a distinct angle. Both kinds of pinnules are shown 

 in the figures. Nearly continuous and distinctly interrupted 

 sori often appear on the same frond. The rootstock is creep- 

 ing, two or three lines in diameter, closely covered with ap- 

 pressed, linear, sharply acuminate, brown scales. The stipes 

 are usually not more than a ^ of an inch apart at base. 



Quite common in rather rich soil in the higher deep woods 

 near Moyogalpaon Ometepe. Fournier {ibid.'} reports it from 

 near Granada, and, as A. acuminatum, from Chontales. He 

 also reports A. oblique-truncatum from Granada and declares 

 that it is not A. villosum L., but A. villosum Eaton. Hemsley 

 [ibid.) reports it from Chontales. 



8. A. PULVERULENTUM L. PI. X, Fig. I. 



Linn., Syst. Nat., vol. 11, p. 695; Swz., Syn. Fil., p. 124; Lieb., Mex. Breg., 

 p. 113; Hook., Sp. Fil., vol. 11, p. 17; Eaton, Fil. Wr. et Fend., p. 202; 

 Hook, and Bak., Syn. Fil., p. 122; Smith, Ferns, Brit, and For., p. 1S4; 

 Fourn., Sertum Nic, p. 259; Hemsl., Biol. Cent. Am., vol. in, p. 610:. 

 Hitch., PI. Bah., p. 152. 



