75 



Ophioglossaceae 



Ophioglossum viilgatum L. Adder's-tongue 



Botrychium simplex Hitchcock Little Grape-fern 



Botrychium simplex j. siibcomposifum 



(Lasch) Milde 

 Botrychium simplex f. compositum (Lasch) 



Milde 

 Botrychium lanceolatum var. angitstiscg- 



moitum (Gmel.) Angstr. Lance-leaved Grape-fern 



Botrychium matricariaejolium A. Braun Matricary Grape-fern 



Botrychium dissectiim Sprengel Cut-leaved Grape-fern 



Botrychium dissectiimj. ohliqmwi (Muhl.) Fern 

 Botrychium disscctumf. elongatum (Gilbert' 



and Haberer) Weather by 

 Botrychium dissectiim f. oncidensc (Gilbert) 



Clute 

 Botrychium multifiduvt var. intermedium 



(D. C. Eaton) Farwell Multifid Grape-fern 



Botrychium virginianum (L.) Sw. Virginia Grape-fern 



Literature Cited 



L Bailey, William W. 1895. Among Rhode Island Wild Flowers. Preston 

 and Rounds. Providence, R. L 



2. Bennett, James L. 1888. Plants of Rhode Island. Providence Press Com- 



pany. Providence, R. I. 



3. Noble, George. 1920. Ferns, Fern Allies and Flowering Plants of Rhode 



Island, Snow and Farnham Company, Providence. R. I. 



4. Weatherby, C. A. 1935. A List of Varieties and Forms of the Ferns of 



Eastern North America. Amer. Fern Journ. 25:45-51, 95-100. 



. 1936. Ibid. Amer. Fern Journ. 26:11-16, 60-69, 94-99, 131-136. 



. 1937. Ibid. Amer. Fern Journ. 27: 20-24, 51-56. 



Botany Department, 

 Rhode Island State College, 

 Kingston, R. I. 



Poison Ivy. Perhaps more questions are asked about poison ivy 

 and its allies than any other plant that causes skin eruptions. "Rhus 

 Dermatitis" by James B. AIcNair (The University of Chicago 

 Press) is an extensive treatise.covering nearly 300 pages. The chap- 

 ters dealing with the history, distribution, morphology and anatomy, 

 resin canals, origin and occurrence of the poison contains a wealth 

 of botanical information. The chemistry and pathology of the plant 

 as it relates to medicine is well written. 



