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free from the rest; fronds 16 to 27 cm. long. 8 to 17 cm. 

 wide, the broadest pinnae being about 2 cm. wide and cut 

 irregularly in the middle about half way to the costa; 

 pinnae on the upper half of the frond decurrent and 

 united, ends of pinnae rather sharply acute. Habitats: 

 Rock City, Dutchess Co., N. Y. (Prof. C. H. Peck) ; 

 West Goshen, Conn. (Dr. L. M. Underwood) ; Shanda- 

 ken, N. Y. (Miss M. F. Miller); Cold Spring, N. Y. 

 (Miss Moncks) ; Mt. Desert, Me. (Miss E. L. Shaw). 



7. Var. Columbianum Gilbert. A small fern with cori- 

 aceous frond. Whole plant 13 cm. long at most, and 3-J 

 cm. wide; pinnae numerous, closely placed, blunt or 

 bluntly acute, two lowest pairs often deeply lobed on the 

 lower edge and somewhat on the upper edge also ; stipe 

 very short about one-quarter the length of the whole 

 frond ; sori round, large, at length confluent and covering 

 nearly the whole under surface of the pinnae, somewhat 

 immersed and prominent on the upper side ; upper sur- 

 face covered with glands which are sometimes golden 

 and give a golden hue to the fern. Habitats : Arrow 

 Lake, Columbia River, B. C. (A. J. Hill) ; near O'Kan- 

 agan Lake. Rocky Mts., B. C. (B. T. Gilbert). 



8. Forma deltoidcum f. nov. The fronds of this form 

 are strongly deltoid in shape, much the broadest at base 

 and more than half as wide there as they are long. The 

 lowest pair of pinnae often have an auricle on the lower 

 edge at the base. The frond bears only from four to 

 seven pairs of pinnae, and ends in a lanceolate pinna 

 slightly pinnatifid at base, two to three centimeters long 

 and serrate or sinuate on the edges. Three or four sori 

 on the terminal pinnae seem to be all the fruit which 

 they bear. Habitat: Rocks at Griffin's Corners, Dela- 

 ware Co., New York (J. C. Buchheister). Dr. Waters 

 sent me a blue-print of the same form, but without 

 details as to locality. It is one of the easiest forms of 

 all to recognize. 



9. Forma hastatum f . nov. In a general way this 

 much resembles deltoidcum. But in two respects it dif- 



