O. Boottii (Tuckerm. ) Underw. Boott's Shield-kern. Rare. 

 Susquehanna, Graves. Pond Brook, Clitte. The only stations 

 reported. In appearance this fern is about half way between 

 D. spinulosa and the following. Further study of the forms re- 

 ferred to these two ferns will doubtless discover more stations 

 for the present species. (Aspidiuw Boottii Tuckerm. ) 



D. cristata (L. ) A. Gray. Crest Fern. Crested Shield-Fern. 

 Plentiful in swampy woods. Fronds tall and narrow, lanceolate 

 in outline, pinnate, their divisions pinnatifid. the lowest pair of 

 pinnte triangular. The sterile fronds are usually shorter and 

 broader than the fertile and less erect In sheltered situations 

 the fronds of this species are nearly evergreen. (Aspidiu?n 

 cristatum Sw. ) 



D. cristata Clintoniana (D. C. Eaton) Underw. Rare. Swamp 

 near the city of Binghamton, Clute. Unadilla Forks, Brown. 

 The only stations recorded. The fronds of this fern are in every 

 way larger than the preceding, which it otherwise much re- 

 sembles. Closer observation of our ferns will probably bring to 

 light other stations for this one. (Aspidium cristatum, var. 

 Clintonianum D. C. Eaton.) 



O. Goldieana (Hook ) A. Gray. Goldie's Shield-Fern. Rare. 

 In swampy ground east of Van Etten. Chemung county, N. Y., 

 Barbour. Near Unadilla Forks; not common, Brown. The 

 only stations. This fern may occur at other points within our 

 limits and should be looked for in cold, wet woods. In appear- 

 ance it is considerably like the following and might be mistaken 

 for a large form of it. {Asfiidium Goldieana Hook.) 



O. marginalis (L. ) A. Gray, Marginal Shield Fern. Ever, 

 green Wood-Fern. Abundant in deep shades. Fronds two 

 feet or more high, about twice pinnate. Well known for the 

 bright, white covering of the fruit dots, which are borne on the 

 back of fronds like the sterile ones. The fronds remain green 

 through the winter, but are usually prostrated by wind and 

 snow. This fern will endure much more in the way of light 

 and dryness than most of its relatives, and is excellent for the 

 fernery. {Aspidium marginale Swartz.) 



O. acrostichoides (Michx. ) Kuntze. Christmas Fern. Abun- 

 dant throughout our range, especially in evergreen woods. 

 Fronds thick, evergreen, pinnate, the fertile contracted at the 



