23 75 



5. Pinnæ linear, slightly lobed; lobes broader than long, oblique, 



as a rule faintly crenulate or obtusely dentate. Veins 2 — 5. 



6. Veins short. Pinnæ not or shortly auricled at the upper 



base. 



7. Pinnæ 25 cm. long by 2'/'2 cm. broad; veins 4 — 5-jugate, 



rather patent; sori medial 12. S. rohindata (Willd.) C. Chr. 



7. Pinnæ 12 — 18 cm. long by T'/i— 2 cm. broad; veins 

 2— 4-jugale, more erect, often very short and distant; 



sori near the midrib 13. S. Carrii (Bak.) C. Chr. 



6. Veins longer, ascending. Pinnæ with a large, broad auricle. 



27. D. sancti gabrieli (Hk.) C. Chr. 

 5. Pinnæ linear or lanceolate, lobed Vs — ^k of the way down; 

 lobes generally longer than broad. Veins 5 — 7 jugate. 

 6. Pinnæ lanceolate, 12 — 18 cm. long, 3 cm. broad, with 

 close, entire, falcate lobes. Veins 6— 7-jugate. Light- 

 green 14. S. tijuccana (Raddi) C. Chr. 



6. Pinnæ linear or lanceolate with more or less répand or 

 dentate lobes. Colour dark-green. 



7. Pinnæ narrow-linear; lobes patent with open sinuses 

 between. Veins about 5 to a side. Sori inframedial. 

 Immersed glands verj' large. Brazil. 



15. S. prionites iKze.) C. Chr. 

 7. Pinnæ linear-lanceolate, broadest at the middle; lobes 

 falcate, rather close. Andine species. 

 8. Sori medial without paraphyses. Lobes falcate, more 



or less dentate 16. S. nephrodioides (Kl.) C. Chr. 



8. Sori inframedial with articulated paraphyses. Lobes 



narrow, falcate, répand 17. S. Michaelis (Bak.) C. Chr. 



4. Most pinnæ with a long decurrent base, those of the upper 

 third of the leaf connected by a broad wing to the rachis. 

 5. Pinnæ deeply lobed with narrow, répand lobes. 



17. S. Michaelis (Bak.) C. Chr. 

 5. Pinnæ subentire, serrate or slightly lobed. 



6. Pinnæ approximate, linear, serrate, about 15 cm. long, 



2''2 cm. broad 18. S. longicaiidata (Liebm.) C. Chr. 



6. Pinnæ distant, about 15 cm. long, 3 — 4 cm. broad, subentire 

 or irregularly crenate or slightly lobed ; veins frequently 



anastomosing 19. S. alloëoptera (Kze.) C. Chr. 



3. Sori confluent ; venation meniscioid 20. S. opaca (Bak.) C. Chr. 



2. Pinnæ incised to a narrow wing to the costa, or lamina bipinnate- 

 tripinnatifid. Veins often furcate. 



3. Lamina bipinnatifid with toothed or lobed segments. 

 4. Sori without indusium-like, inferior scale. 



5. Segments generally toothed throughout, separated by broad, 

 open sinuses, somewhat contracted above the widened base, 

 5 — 7 mm. broad. Lower basal segment of most pinnæ 



considerably reduced. Brazil 21. S. caudata (Raddi) C. Chr. 



5. Segments close, up to 1 cm. broad, sharply toothed at their 

 apex, the edges entire or faintly crenate. Lower basal segment 



scarcely abbreviated. Andes 24. S. pellacido-piinctata C. Chr. 



4. Most sori with an inferior, indusium-like scale; Andine and 

 West Indian species. 



