GUIDE 



GROUP IV 



FERTILE AND STERILE FRONDS LEAF-LIKE AND SIMILAR; 



SPORANGIA ON OR BENEATH A REFLEXED PORTION 



OF THE MARGIN 



[The first clause bars out P. gracilis and P. atrofurpurea, 

 which otherwise would belong to Group IV as well as to Group 

 III.] 



20. BRAKE 



Pteris aquilina 



Large and coarse, frond 3-branched, spreading, each branch 

 2-pinnate, sporangia in a continuous line beneath the reflexed mar- 

 gin of the frond. In dry, somewhat open places. P. 105. 



21. MAIDENHAIR 



Adiantum pedatum 



Graceful and delicate, frond forked at the summit of the stem, 

 2-pinnate, the pinnas springing from the upper sides of the branches, 

 pinnules one-sided, their upper margins lobed, bearing on their 

 undersides the short fruit-dots. In rich woods. P. 108. 



22. HAIRY LIP FERN 



Cheilantkes vestita 



Rather small, fronds 2-pinnate, hairy, fruit-dots "covered by 

 the infolded ends of the rounded or oblong lobes." On rocks. 

 P. 112. 



23. HAY-SCENTED FERN 



Dicksonia pilosiuscula 



Rather large, pale, delicate and sweet-scented, fronds usually 

 2-pinnate, fruit-dots small, each on a recurved toothlet of the pin- 

 nule, borne on an elevated, globular receptacle. In moist thickets 

 and in upland pastures. P. 1 14. 



44 



