A List of the Pteridophyta collected in Alaska in 1900 by Mr. J. B. 



Flett, with description of a new Dryopteris 



By William R. Maxon 



A short time ago Mr. J. B. Flett kindly placed in my hands 

 for determination a set of his collection of ferns and fern allies made 

 in Alaska, largely in the vicinity of Cape Nome, during the summer 

 of 1900. These specimens, which have been deposited in the 

 National Herbarium, have proven of considerable interest, espe- 

 cially since they come in part from a region so little explored 

 botanically. One species is apparently undescribed ; the others it 

 seems desirable to catalogue for the record of their occurrence. 

 The notes upon habitat have been furnished by Mr. Flett. 



OPHIOGLOSSACEAE 



Botrychium boreale (Fries) Milde. 

 No. 1705. Unalaska ; June 19. Rather immature. 



POLYPODIACEAE 



POLYPOD1UM VULGARE OCCIDENTALE Hook. 



No. 1 5 10. Dutch Harbor, Unalaska. Growing abundantly 

 among heather on level ground near the shore ; June 15. Very 

 abundant all about the island. 



This specimen represents a form abundantly collected in 

 Alaska, but less common along the lower coast, with nearly entire 

 and blunter pinnae, for the most part, but otherwise similar to what 



as 



Cryptogramma acrostic ho ides R. Br. 



Not 



No. 1504. Rocky ledges, vicinity of Nome City; July 21 



common. 



Athvrium cyxlosorum Rupr. 



No. 1 5 12. Dutch Harbor, Unalaska, June 12. 



Phegopteris Phegopteris (L.) Underw. 



No. 1502. Sixteen miles west of Nome City ; in the shade of 

 alders and willows at the base of the mountain, and among grasses 



permi 



637 



