jyo NATURAL HISTORY BULLETIN. 



Family IX. ASPIDIE^. 

 Genus DIDYMOCHL^ENA Desv. 



Reported Species. 

 D. lunulata Desv. 



Fourn., Sertum Nic, p. 259, from Chontales (as D.sinuosa Desv.); Hemsl., 

 Biol. Cent. Am., vol. ill, p. 641, from Chontales. 



Genus OLEANDRA Cav. 

 1. O. nodosa Presl. 



Presl, Tent. Pter., p. 78; Eaton, Fil. Wr. et Fend., p. 212; Hook., Sp. Fil., 

 vol. iv, p. 157; Roth., Les Foug., vol. 11, p. 69, pi. xxiv; Hook, and Bak., 

 Syn. Fil., p. 303; Smith, Ferns, Br. and For., p. 74; Hemsl., Biol., Cent. 

 Am., vol. in, p. 653; Bak., Biol. Cent. Am., vol. iv, p. 116 (from Costa 

 Rica). 



Quite rare, on trunks of trees near Camp Menocal. The 



specimens are typical. 



Not heretofore specifically reported from Nicaragua. 



from the outlines in the first part of this paper. But upon more mature 

 reflection it is thought best to separate all the forms with inferior indusia 

 from the Family Aspidiece. The Family Woodsiea: should include the gen- 

 era Sphczropteris, Hypoderris, Woodsia and Otioclea, and possibly Cystopteris, 

 though its affinities are rather with the Davalliecv. Though Eaton's name 

 is adopted, the Family as here recognized is more comprehensive. It may 

 be characterized as follows: 



Sori globose, on the back or apex of a vein, indusium membranaceous, 

 inferior, at first usually enclosing the sorus, finally bursting above and 

 forming a cup usually of several radiating divisions. 



The Family Woodsiea should be included in the outlines on pp. 124 and 

 126 of this paper, as No. viii, between the Family Cyathece and the Family 

 Aspidiece, and the numbering of the families following it should be corre- 

 spondingly changed. 



So far as the present species is concerned it is by no means certain that 

 it has a place in the genus Hypoderris. None of the specimens in the col- 

 lection show the indusium as perfectly as might be desired, but so far as 

 could be determined from the material in hand the scales or lobes of the 

 indusium do not form a complete cup, but in reality the indusium seems 

 to consist at first of a transverse scale, opening toward the margin of the 

 frond, and ultimately (or at least frequently) dividing into several lobes 

 (see figures). This being the case, if the figure and description of the in- 

 dusium of H. broivnii, the type of the genus Hypoderris, in Synopsis Filicum 

 are correct, it will be necessary to make other disposition of H. seemanni 

 by placing it near Cystopteris, probably in a new genus. 



