PLANTS OF SOUTHERN NEW JERSEY. 121 



hh. Large ferns, leafy often g dm. in height, frond 

 seldom less than 4 dm. long. 

 i. Several pairs of lower pinnae rapidly de- 

 creasing in size, sori elongated. 



Aspleniutn acrostichoides, p. 132 

 a. Lower pinnae about equal in length to the 

 longest, 

 y. Stem with more or less rusty tomen- 

 tum. 

 k. Pinnules usually more round at 

 the tip and often slightly overlap- 

 ping. Sporanges covering short 

 pinnae about the middle of the 

 frond. 



Osmunda claytoniana, p. 125 

 kk. Pinnules more acute and clearly 

 separated. Sporanges on a sepa- 

 rate stalk appearing in early 

 spring. 



Osmunda cinnamomea, p. 124 

 ij. Stem glabrous. 



k. Six to nine lower pinnas becoming 

 rapidly smaller. Sporanges on 

 separate modified frond. 



Matteuccm, p. 137 

 kk. Lower pinnae not shorter. 



Woodwardia virginica, p. 131 

 jjj. Stem with brownish chaffy scales on 

 lower part, pinnae somewhat undulated 

 or even lobed, sori round. 



Dryopteris marginalis, p. 134 

 ff. Pinnules lobed or cut into segments. 



g. Lower pinnae with basal pinnules becoming much 

 shorter. Phegopteris hexagonoptera, p. 136 



gg. Lower pinnae not narrowed at base. 



h. Leafy part of frond not over 1.7 dm. long. 



Pilix fra gilts, p. 135 

 hh. Leafy part of frond normally more than 3.7 dm. 

 long. 

 i. Stem chaffy with brown scales. 



Dryopteris spinulosa, p. 135 

 ii. Stem glabrous or a few scales near the base. 

 y. Dark green, frond glabrous. 



Aspleniutn Ulix-foemina, p. 132 

 jj. Light green frond pubescent below and 

 fragrant. Dennstaedtia punctilobula,^. 136 

 dd. Fronds ternate. 



e. Not over i dm. in diameter, delicate. 



Phegopteris dryopteris, p. 136 

 ee. Over 3 dm. in diameter, thick. Pteridium aquilinum, p. 130 



