SUPPLEMENTAL LIST. 



The following species were reported from Boone county 

 by S. M. Tracy in his Flora of Missouri, published in the 

 Report of the Missouri State Horticultural Society for 1S85. 

 These plants have not been collected in the course of these 

 studies, and no specimens of them from Boone county are 

 extant in the herbarium of the University of Missouri. 

 Some thirty of the eighty-five species included in the fol- 

 lowing list are out of range, and in the absence of authentic 

 specimens their reported occurrence must be considered to 

 be based on errors in determination. Of the remainder 

 some may have become extinct since 1885, while others 

 either have eluded our search thus far or occur only in the 

 more remote parts of the county. 



1. Nephrodium hexagonopterum (Michx.) Diels \_Phe- 

 gopteris hexagonoptera (Michx.) Fee]. Beech fern. 



Boone county (Tracy). 



Quebec to Minnesota; Florida to Louisiana. 



2. Oryptogramma Stelleri (Gmel.) Prantl \Pellaea Stel- 

 leri (Gmel.) Watt.: Pellaea gracilis (Michx.) Hook.]. 

 Slender cliff-brake. 



Boone county (Galloway). 



Labrador to British Columbia; Massachusetts and 

 Pennsylvania to Iowa and Colorado: Asia. 



3. Polypodium vulgare L. Polypody. 

 Boone county (Tracy). 



North America: Europe and Asia. 



4. Potamogeton Spirillus Tuckerm. Spiral pondweed. 

 Boone county (Tracy). 



Nova Scotia to Minnesota; Virginia to Missouri and 

 Nebraska. 



244 [3S6 



