PTERIDOPHYTA. 



FILICINE.E.* 



CHARLES F. MILLSPAUGH, M.D. 



Leafy plants, with the leaves (fronds) entire or cut into many 

 smaller leaflets (pinnules) and usually raised upon a polished, hairy, or 

 scaly petiole (stipe], rising from a generally prostrate or assurgent 

 rootstock. Fronds usually rolled up (circinate) in the bud, and when 

 in fruit bearing on the under surface (commonly .upon the veins or 

 along the margin) the fruit dots (sori}, either bare, or more or less 

 covered by the revolute margin of the leaf, or by a separate membrane 

 (indusiuni); and consisting of one to many i -celled spore-cases 

 (sporangia), opening in various ways and discharging numerous 

 minute seeds (spores'). 



Fronds all alike. 



Margin not revolute. 

 Sori globular 



Indusium circular, smooth Tectaria trifoliata. 



acicular hairy Dryopteris patens. 

 Indusium none 



Sori marginal, distinct Polypodium polypodioides. 



confluent Phegopteris rudis. 



Sori intramarginal Goniopteris tetragona. 



Sori in many parallel lines Campyloneuron phyllitidis. 



two parallel lines only Phymatodes lycopodioides. 



Sori scattered Goniopteris reptans. 

 Sori oblong 



Indusium scaphoid, the margin hairy Asplenium pumilum. 

 the margin glabrous Asplenium dentatum. 

 Sori lineal-continuous, epinerval 

 Indusium none 



Sori completely covering the veinlets tfemionitis Palmata. 

 Margins revolute. 



Sori lineal-continuous Pteridium caudatum. 

 Sori lineal-interrupted 



Pinnules sinuate-lobed, strigose Pellcea aspera. 



hairy Cheilanthes leucopoda. 



glabrous Cheilanthes microphylla. 



Pinnules rhomboid, smooth Adiantum tenerum. 



hairy beneath Adiantum tricholepis. 



Fronds of two sorts, the sterile pinnate. 



Sporangia ovoid, ridged Ornithopteris cicutaria. 



veined Ornithopteris adiantifolia. 



Sporangia globular Ornithopteris Wrightii. 



*The cuts represent a frond or a pinnule natural size unless otherwise stated; and a sorus, 

 sporangium and spore of relatively the same magnification throughout the series. 



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