20*. DICTYOXIVHIUM. 21. ADIANTUM. 113 



40. L. (Dieilia) erecta, Hk. MSS. ; st. 6-9 in. 1., strong, erect, polished, chesnut- 

 bro'wn ; fr, 9-12 in. 1., 3-4 in. br., lanceolate, simply pinnate ; pinnce 1-2 in. 1., 

 -if in. br., linear-lanceolate, slightly undulated at the margin, the upper half 

 rather the broadest and auricled at the base, the lower ones\shorter and broader ; 

 texture herbaceous ; sori 2 to 3 times as long as broad, falling short of the margin. 

 Dieilia erecta, Brack, t, 31. f. 2: 



Hab. Sandwich Islands. 



47. L. (Dieilia) falcata, Hk. MSS. ; st. 3-4 in. L, strong, erect, densely 

 paleaceous ; fr. 12-18 in. 1., 2-4 in. br., lanceolate, simply pinnate ; pinnae 1-2 

 in. 1., j- in. br., linear-lanceolate, falcate, acuminate, slightly undulated at the 

 margin, the upper half rather broadest and auricled at the base, the lower ones 

 very short and blunt ; texture herbaceous ; sori marginal, transversely oblong. 

 Dieilia falcata, Brack, t. 31. /. 1. 



Hab. Sandwich Islands. Distinguished from D. erecta by its short paleaceous stem 

 and marginal sori. 



48. L. (Dieilia) Michleriana, Eaton ; st. slender, elongated, slightly paleaceous; 

 fr. 12-15 in. 1., ovate-lanceolate in general outline, pinnate below with pinnae 

 3-6 in. 1., 1 in. br., the upper half linear, undulated at the margin; texture 

 papyraceo-herbaceous ; veins forming hexagonal areolse with free included 

 veinlets ; sori nearly marginal, transversely oblong or linear, the outer valve of 

 the involucre the same shape as the sorus, but the margin of the frond produced 

 beyond it and unaltered. Eaton, Fil. Wright $ Fendl. p. 213. 



Hab. Cataract of Truando, New Granada, Schott, No. 8. A very curious plant, with 

 the venation of Dictyoxiphium,, but quite different in the fruit, which agrees very well 

 with that of the three species for which Dieilia was proposed as a genus. 



GEN. 20*. DICTYOXIPHIUM, Hook. 



Sori marginal, continuous. Invol. like that of lAndsaya, but the outer valve 

 obsolete. A single species with anastomosing areolar venation and free included 

 veinlets. TAB. 2. /. 20. B. erroneously represents the inner instead of the outer 

 valve of the involucre as suppressed. 



1. D. panamense, Ilk. ; fr. tufted, sessile, 2-3 ft. 1., the barren one 2-3 in., 

 the fertile ^-1 in. br., narrowed from the middle gradually downwards, quite 

 entire ; texture subcoriaceous, the midrib strong and prominent ; sori in a con- 

 tinuous marginal line. Hk. Sp. 1. p. 224. Amphiblestra simplex, Fourn. 



Hab. Tropical America, from Guatemala to New Granada. When the involucre is 

 rolled over the sorus, the latter appears to be placed on the upper surface of the frond. 



TRIBE G. PTERIDKJZ. 



Sori marginal, oblong or linear. Invol. of the same shape as the sorus, formed of a 

 more or less changed and reflexed portion of the frond, opening inwardly. GEN. 

 21-33. 



GEN. 21. ADIANTUM, L. (See page 472.) 



Sori marginal, varying in shape from globose to linear, usually numerous and 

 distinct, sometimes confluent and continuous. Invol. the same shape as the 

 sorus, formed of the reflexed margin of the fronds bearing the capsules on its 

 under side. A large genus, which has its head-quarters in Tropical America, most 

 of the species of which are recognizable from all other Ferns but the typical Lindsayse 



