33 85 



1) The group of D. submarginalis including the species 29—40, closely allied 

 species with differentlj' shaped but never bullate scales; stipe at base as a rule 

 with a dense mass of large scales. Veins reaching the margin. 



2) The groups of D. Lindeni, including the species 44 — 46, smaller Central- 

 American species with very characteristic bullate scales; base of stipe scaly but 

 not with a dense tuft of large scales; veins often furcate, not reaching the margin. 

 The species 41—42, D. nigrouenia and D. Tonduzii are intermediate between the 

 first and the second group. 



3) The group of D. platyloba; hereto the species 48—52, characterized by 

 broad, obtuse segments with normally furcate veins, which do not reach the 

 margin. The lamina is often finely pellucido-punctate ; by this character as well 

 as by venation the species of this group resemble Stigmatopteris, from which they 

 differ by the non-serrated apex of the pinnæ and by the presence of articulated 

 hairs. In some of the species the articulated hairs are subulate, and very short, 

 unicellular hairs are also found. To this group mainly decompound species belong; 

 D. refiilgens is an intermediate between the first and the third group. 



Key. 



1. Veins normally simple, still often forked in the basiscop enlarged segments of 

 the lower pinnæ. 



2. Segments normally entire or faintly crenate or serrate; the basal pair of 

 pinnæ scarcely enlarged. 



3. Pinnæ incised ^i■^■ — '^l:\ of the way to the costa; the lower 2 — 5 veins run 

 to the sinus. 



4. Pinnæ incised Vs — '/s into broad, obtuse segments; the lower 4 — 5 veins 

 (2 pairs) run to the sinus. 



5. Pinnæ 10 — 15 cm long by 2^-' — 3 cm broad, abruptly and shortly 

 acuminate; scales few, dark, toothed. Brazilian species 



29. Ü. pedicellata (Christ) C. Chr. 



5. Pinnæ 20cm long by 4cm broad, long acuminate; scales numerous, 



entire, reddish. Andes and Guiana... 30. D. refulgens (Kl.) C. Chr. 



4. Pinnæ incised '/a — '■'hi; 2 basal veins run to the sinus. Scales very few 



and small, dark. Lamina generally with a distinct terminal pinna. 



31. D. alsophilacea (Kze.) O. Ktze. 

 3. Pinnæ incised to a narrow wing to the costa or larger ones of some 

 species fully pinnate in their basal part. 



4. Scales of rachis dark and rigid, not thin, hairlike and not broad and 

 reddish. Indusium persistent. 



U. K. I). VicU-iisk. Selsk SUr., 7 lUtUke, natuiviileiisk. a« malheiii. Aid. X. 2. y> 



