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In the following key the most important characters of each 

 species are mentioned. The remarks under each species contain 

 mostly comparative notes. 



As in my former papers on ferns I have used the following 

 abbreviations: 



IIB = Herbarium Berolinense. 



HG — Herbarium H. Christ, Basle. 



HH = Herbarium Hauniense. 



HHg = Herbarium Regnellianum, Stockholm. 



HW = Herbarium of the U. S. National Museum, Washington. 



Key to the species. 



I. Pinnae nearly entire, serrate or lobed not more than V2 of 

 the way down to the midrib, seldom a little more. 

 A. Only the uppermost pinnae with a short decurrent base. 



1. Pinnae linear, slightly lobed; lobes broader than long, 

 oblique, as a rule faintly crenulate or obtusely dentate. 

 Veins 2 — 5. 



a. Pinnae 25 cm. long by 2^2 cm. broad; veins 4 — 5 on 

 each side of the costule, rather patent; sori medial; 

 immersed glands normally distinct, but not very large 

 or numerous; texture thin; colour generally light- 

 green 1. S. rotundata. 



b. Pinnae 12—18 cm. long by 1^/4 — 2 cm. broad; veins 

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

 small, near the costule; immersed glands indistinct, 

 very numerous and small; texture rather thin; colour 

 dark-green or grass-green. Brazil 2. 6'. t'arrii. 



2. Pinnae linear or lanceolate, lobed ^/:i — ^/-j of the way 

 down; lobes generally longer than broad. Veins 5 — 7. 



a. Pinnae lanceolate, 12—18 cm. long, .3 cm. broad at 

 the middle. Lobes quite entire, falcate, close; veins 

 6 — 7; sori medial, often somewhat oblong; immersed 

 glands small, not very distinct; texture firmly her- 

 baceous ; colour generally light-green. Brazil. 3. S. tijuccana. 



b. Pinnae linear or lanceolate, lobes more or less den- 

 tate or repand; colour dark-green. 



a. Pinnae narrow-linear, 15 cm. long by I'/a — 2 cm. 

 broad; lobes patent with open sinuses between; 

 veins about 5 ; sori near the costule or at least 



