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The Most Important Characters of the Subgenera. 
(The American species only considered.) 
A. Lamina entire to bipinnate; very rarely tripinnate or decompound (D. Linnae- 
ana, Robertiana, setigera), most often bipinnatifid, more or less hairy but sparsely 
scaly. Hairs of different type, most often unicellular, simple or branched, never 
articulated; scales entire or subentire, often ciliated by simple or branched hairs 
or pubescent throughout. Veins free, connivent or goniopteroid. 
I. 
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D. K. D, Vidensk, Selsk, Skr., naturvidensk, og mathm. Afd. 8. Riekke, Wie 
Lastrea (incl. Phegopteris proper and Glaphyropteris). Veins free, the basal 
ones run out to the margin above sinus, rarely fureate. Lamina bipinnatifid- 
bipinnate, very rarely more divided (D. Linnaeana etc.), often much reduced 
toward the base. Hairs nearly always simple. Indusium present, most often 
small, or none. Aérophores frequent at the base of the pinne; in the section 
Glaphyropteris aérophores are found also at the base of the pinnules. Sessile 
glands common. Species 1—140. 
. Steiropteris, As Lastrea, but the basal veins run to the sinus, below which 
is a cartilagineous membrane, that in dried specimens becomes folded and 
forms a keel running from the sinus toward the costa. Aérophores at the 
bases of pinnz frequent; sessile glands none. Rhizome creeping. 
Species 141—153. 
. Cyelosorus. Lower 1—4 pairs of veins run to sinus or to a membrane, 
which scarcely forms a keel but is often protruded beyond the sinus as an 
apophysis, or the basal pair of veins are united in the leaf-tissue and send 
an excurrent vein to the sinus. Aérophores none; under-surface often glandular. 
Lamina often softly pubescent by single hairs as are the generally persistent, 
reniform indusia. Sori globose, sporangia glabrous. Species 154—166. 
Leptogramma. As Cyclosorus, but sori oblong or linear, exindusiate; sporangia 
setose. Species 167—169. 
Goniopteris. Veins free, the basal ones connivent to sinus, or anastomosing, 
goniopteroid or meniscioid. Lamina often proliferous, most often dark-green. 
Scales few, always with few or many branched hairs; branched, short-stalked 
hairs are found also on the rachis and, in some species, also on ribs and 
leaf-tissue. Sori round, indusiate or not; sporangia setose or not. 2 
Species 170—232. _ 
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