22..'-^" DftYOPTERIS.^ 175 



veinlet springing from the top, free or joined in the angle of the next 

 superior anastomosing veins, which often form 1 or more rows of regular, 

 rhomhoidal areolae between the costal ones and the margin. Segments mostly 

 eijual-sided; or nearly so ; surfaces often ± hairy ; texture commortly herba- 

 ceous. — The species are difficult of determinalion unless the whole stipe 

 and the rhizome are present; the frond only is of little value. 

 Tropical and extra-tropical. 



Arrangement of the sections. 

 §1. LASTRAEA. Veins free. Indusium reniform. Hk. Bk., Syn. Pil., tab. V, 



§ 1. LASTRAEA. 



:. Fronds simple, or pinnae cut less than ^'^-way down to the casta, i 



:+:. Fronds subsessile. Pinnae entire or slightly crenale. (1) D. Warburgii. 



j ** Fronds moderately long-stalked, or pinnae lobed^l^ — ^j^-way -down. 



^ » (2) D. hirtipes. 



.a. Fronds pinnate. Pinnae cut more than %-way down to quite to the casta. 



Secondary segments entire or crenate to reparid ('). n /) ' D f • 



1. Central ribs of the lobes pinnate; veins simple, oJ^r ^~t t^ SoU)'^ J&^*~<^ 

 Z. Lower pinnae slightly, if at all, reduced, not dwindling down into 

 mere auricles. 



3. Fronds small, under iO c.M. long (='). (3) D. grammitoides. 

 3.3. Fronds more than iO c.M. long. 



4. Texture + chartaceous or coriaceous. 

 S. Fronds under 75 c.M. long. 



e. Surfaces naked, at best pubescent on the costae. 

 If. Rachis naked ('). 



(') See also D. phegopteroldea, C. Chr. 

 {') See also D. diversifolla, v. A. v. R. 

 {') See also D. pecflnata, v. A. v. R. 



