J20 REPORT OF NEW JERSEY STATE MUSEUM. 



ee. Leaf petiolcd from near the base of the stem. 

 /. Segments pinnate, pinnae not much cut. 



B. obliquum, p. 123 

 //. Pinnae finely cut. B. o. dissectutn, p. 123 



cc. Sporanges in a mass at the summit or middle of an erect "fern- 

 like" frond or in small spots or lines (sori) on its back, or in 

 several species on separate, modified, slender fronds. Fronds all 

 pinnate (divided into lateral segments, which may be again di- 

 vided). 

 d. Fronds not ternate. 



e. Pinnae finely serrate, but not lobed or cut. 



/. Main stalk shining dark purplish, frond not over 25 mm. 

 wide. Asplenium platyneuron, p. 132 



ff. Stalk not dark and polished. 



g. Pinnae on distinct pedicels with an acute lobe at 



the base. Polystichum, p. 133 



gg. Pinnae widening at base and joining to form a 



winged margin to the stalk. 



h. Frond less than 75 mm. wide round sori on 



back of fertile fronds. 



Polypodium vulgare, p. 129 



hh. Frond over i dm. wide, pinnae finely serrulate, 



sometimes undulate, sori oblong in two rows 



on a separate frond with narrow linear pinnae. 



Woodwardia areolata, p. 131 



ee. Pinnae more or less lobed, but not cut to the midrib. 



f. Lobes often mere undulatious, pinnae entire and dis- 

 tinctly narrower at the base. Ferile frond separate, a 

 stalk with a panicle of round seed-like bodies at its 

 summit bearing the sporanges. 



Onoclea sensihilis, p. 137 



ff. Lobes rather deeply cut, at least the basal ones, pinnae 



broadest at the base, often somewhat triangular. Sori 



on back of frond. Dryopteris cristata, p. 134 



eee. Pinnas cut nearly or quite to the midrib. 



f. Pinnules not toothed or subdivided. 



g. Pinnules distinctly pedicilled, minutely serrulate, 

 sporanges in a terminal panicle plant 6-g dm. high. 

 Osniunda regalis, p. 124 

 gg. Pinnules united at their bases, forming a margin 

 to the midrib. 

 h. Small ferns, leafy part of the frond rarely 

 over 3 dm. in length. 

 i. Lowest pinnae longest. 



Dryopteris thelypteris, p. 133 

 ii. Two lower pairs of pinnae slightly shorter 

 than the longest. D. simulata, p. 134 



Hi. Six lower pairs of pinnse rapidly decreas- 

 ing in size, last about 6 mm. long. 



D. noveboracensis, p. 133 



