﻿its DRYOPTERIS. § 1. LASTRAEA. 



4'. Pirmae cut + \-way down to the casta (*). 



(26) D. exigua. 

 4L'.4L'. Pinnae cut down + to the casta. (27) D. conterminoides. 

 3'.3'. Sari near the margin, or terminal on the veins. 



■^. Rhizome short. Veins 8 — d2 on a side. Fronds rather 



large. (28) D. Luerssenii. 



•J-.f. Rhizome wide-creeping. Veins 4 — 5 on a side. Fronds 



rather small. (29) D. Beddomei. 



1.1. Central ribs pinnate, lateral veins forked. 



t. Rachis scaly. (30) D. adnata. 



!.!. Rachis naked, hairy or fibrillose. • 

 ■f. Fronds under 75 c.M. long. 



?. Stipes dark-coloured. Surfaces naked. Rachis naked. 



(31) D. sagenioides. 

 ?.?. Stipes grey. Surfaces finely, pubescent. Rachis pubescent 



(32) D. singalanensis. 



•f.-{>. Fronds more than 75 c.M. long when fully developed. Rachis 



fibrillose. (33) D. Wigmanii. 



1.1.1. Central ribs pinnate, lower lateral veins subpinnate. (34) D. filix mas. 



a.a.a. Fronds pinnate. Pinnae cut down nearly or quite to the costa. Secondary 



segments toothed or lobed. 



h. Secondary segments toothed. 



i. Sinuses with a tooth in the top, just between each pair of lobes. 



(35) D. syrmatica. 

 !.t. Sinuses without tooth m the top. Indusia red when young. 



(36) D. erythrosora. 

 h.b. Secondary segments lobed, not pinnatifid. 

 c. Fronds under 75 c.M. long. 



d. Under surface naked. Texture + chartaceous or coriaceous. 



e. Ultimate lobes entire, with ± 6 pairs of veins. Sori 



subcostular. (37) D. Preslii. 



e.c. Ultimate lobes crenate or toothed, with ± 3 — 4 pairs 



of veins. Sori medial on the lower veins. 



(38) D. chaerophyllifolia. 

 d.d. Under surface fibrillose on the main veins. Texture herba- 

 ceous. Sori costal. (39) D. edulenta. 



(*) See also D. hlspldula, 0. Ktze, 



