286 BOTANICAL GAZETTE [OCTOBER 
confusion and to provide an available account of the North American 
species of the boreal group, which shall include comparative notes, 
and shall cite the specimens to be found in some of our herbaria. 
I have been fortunate in having access, through the courtesy of 
Professor FARLow, to the Tuckerman Herbarium, which contains 
authentic material of the following species: 
S. coralloides Fr., S. denudatum Flke., S. nanodes Tuck., S$. paschale var. 
conglomeratum Fr., S. tomentosum Fr., S. Wrightii Tuck., S. cereolinum 
Koerb., S. Despreaultii Del., S. glaucescens Tuck., and S. tenellum Tuck. 
Professor FARLow’s own herbarium contains an authentic 
specimen of S. foliiforme Hue; and Professor Fink has kindly 
communicated a specimen of S. alpinum Laur. from LAURER’S 
herbarium, which I have taken to be authentic. 
In addition to the Tuckerman collection (cited as “Tuck”), 
the following herbaria have furnished the basis for study. The 
abbreviations in parentheses are those used in the body of this 
paper in the citation of specimens. 
1. Cryptogamic Herbarium of Harvard University, including 
the personal collection of Professor W. G. Fartow. (H) 
2. Herbarium of Wellesley College. (W) 
3. The Crara E. Cumatncs lichen collection, Wellesley 
College. (CEC) 
4. The C. J. SpracuE collection at the Boston Society of Natural 
History. (BSNH) 
5. Herbarium of the Thoreau Museum of Natural History, 
Middlesex School, Concord, Mass. (Th) 
6. Herbarium of the University of Vermont, including the col- 
lections of C. C. Frost and Dr. C. G. Princie. (UVM) 
7- Herbarium of Brown University. (B) 
8. Herbarium of Yale University. (Y) 
9. Herbarium of the New York Botanical Gardens. (NY ) 
10. He barium of the Geological Survey of Canada. (Can) 
1. The Mt. Desert Herbarium (in the possession of Mr. E. L. 
RAnbD). (Mt.D) 
12. Herbarium of Professor Bruce Fink, Oxford, Ohio. (F) 
13. Herbarium of L. W. Rippre, Wellesley, Mass. 
‘If my interpretation of the principles of generic nomenclatur® 
