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distinctly inframedial; immersed glands very large 

 and distinct, irregular. Brazil. . 4. S. prionites. 

 J3. Pinnae linear-lanceolate broadest at the middle; 

 lobes falcate, rather close. Andine species. 



I. Pinnae 15 — 18 cm. long, 2V-2 cm. broad, 

 scarcely incised Vi of the way down; lobes 

 falcate, more or less dentate ; veins 5-^6 ; 

 sori medial without paraphyses; immersed 

 glands distinct h. S. nephrodioides. 



II. Pinnae c. 15 cm. long 2^/2 — 3 cm. broad, in- 

 cised -/s, the upper decurrent; lobes falcate, 

 narrow repand; veins 6 — 7; sori inframedial 

 with articulated paraphyses; immersed glands 

 very numerous and small, indistinct. 



6. S. Michaelis. 

 B. Most pinnae with a long decurrent base, those of the upper 

 ^/s of the leaf connected by a broad wing to the rachis. 

 Andine species (see also S. Michaelis). 



1. Pinnaj approximate, linear, about 15 cm. long, 2^2 cm. 

 broad, serrate 1. S. longicaudata. 



2. Pinnae distant, broad-lanceolate or broad-linear, about 

 15 cm. long, 3 — 4 cm. broad, subentire or irregularly 

 crenate or slightly lobed ; veins frequently anastomosing. 



8. S. alloeoptera. 

 II, Pinnae incised to a narrow wing to the costa ; segments gene- 

 rally toothed or lobed. Rachis often with small, appressed, 

 peltate scales. 

 A. Sori without indusium-like, inferior scale. 



1. Segments generally toothed throughout, separated by 

 broad, open sinuses, often spathulate, i. e. somewhat 

 contracted above the widened base, seldom more than 

 6 — 1 mm. broad, acute. Lower basal segments of 

 most pinnae considerably abbreviated. Brazil. 



9. S'. caudata. 



2. Segments close, c. 1 cm. broad, sharply toothed at their 



apex, edges faintly crenate. Andes. 12. S . pellucido-punctata . 

 B. Most sori with an inferior, indusium-like scale. Andine 

 and West Indian species. 



1. Lower basal segment of most pinnae abbreviated. Seg- 

 ments patent or oblique, not contracted above their base; 

 costae and costulae beneath rather scaly. 10. S. ichtiosma. 



2. Basal segments both much enlarged (excepting perhaps 



