J20 REPORT OF NEW JERSEY STATE MUSEUM. 



cc. Leaf petioled from near the base of the stem. 

 /. Segments pinnate, pinna' not much cut. 



B. ohlxquum, p. 123 

 if. Pinnae finely cut. B. o. dissectum, 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 tcrnate. 



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



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

 wide. Asf^leninni platyneuron, p. 132 



//. 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. 



/;. Frond less than 75 mm. wide round sori on 



back of fertile fronds. 



Polypodimn vulgare, p. 129 



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



sometimes undulate, sori oblong in two rows 



on a separate frond with narrow linear pinnae. 



Woodzvardia areolata, p. 131 



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



f. Lobes often mere undulations, 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. 



0)10 cJca sensibilis^ p. 137 



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



broadest at the base, often somewhat triangular. Sori 



on back of frond. Dryopteris cristaia, p. 134 



eec. Pinnae 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 6-9 dm. high. 

 Osmimda rcgalis, 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. 

 J. Lowest pinnae longest. 



Dryopteris thelypteris, p. 133 

 «. Two lower pairs of pinnae slightly shorter 

 than the longest. D. simulata, p. 134 



ii'i. Six lower pairs of pinna; rapidly decreas- 

 ing in size, last about 6 mm. long. 



D. noveboracensis, p. 133 



