lO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 72 



ovate-deltoid, 1.8 to 2 mm. long, 0.9 to i mm. broad, acuminate, 

 setigerous at the acutish tip (the seta 0.2 to.0.4 mm. long, stout, rigid, 

 scabrous, lutescent from a darker base), ciliate, the cilia close, 16 to 

 21 on each side, stiff, rigidly ascending, up to 0.08 mm. long. 

 Megasporangia few, basal ; megaspores orange-yellow, 0.46 to 0.5 

 mim. in diameter, oblate-spheroidal, rugose in all aspects, the com- 

 missural costae short and prominent. Microsporangia very numer- 

 ous ; microspores dull orange, about 0.032 mm. in diameter. 



Type in the U. S. National Herbarium, No. 1028638, collected in 

 the vicinity of Sexton Glacier, Glacier National Park, Montana, 

 altitude 1,950 to 2,220 meters, on a moist rocky slope, August 7, 1919, 

 by Paul C. Standley (No. 17228). Other material studied is as 

 follows : 



Montana (Glacier National Park) : Gunsight Pass and vicinity, 

 alt. 1,775 to 2,100 meters, August 25, 1919, Standley 18136; August 

 25, 1917, Ulke. Along the trail from Many Glacier Hotel to Piegan 

 Pass, alt. 1,500 to 2,160 meters, August 11, 1919, Standley 17483. 

 Vicinity of Iceberg Lake, alt. 1,740 to 1,950 meters, July 11, 1919, 

 Standley 15363. Ptarmigan Lake, alt. 1,800 to 1.900 meters, August 

 3, 1 91 9, Standley 16970. 



Alberta: Tunnel Mountain, alt. 1,650 meters, June 11, 1906, 

 Brown 95. 



The writer takes pleasure in dedicating this excellent species to 

 Mr. Paul C. Standley, who, in the course of his botanical exploration 

 of Glacier National Park, assembled an extraordinarily rich collec- 

 tion of material in this group, the specimens comprising (besides 

 6'. standleyi) S. montancnsls Hieron., 6^. densa Rydb., and 6". wallacei 

 Hieron., all in ample series. 



Superficially 6". standleyi most resembles S. watsoni Underw., of 

 the high mountains of Litah, Nevada, and California, in which also 

 the leaves have lutescent setae. It is at once distinguished from 

 S. watsoni, however, by the fact that the setae (which are even 

 darker) are not only 2 to 3 times as long but are strongly serrulate- 

 scabrous nearly throughout, those of S. watsoni being smooth or 

 nearly so. The sporophylls also have longer and scabrous setae, and 

 the blades are much more freely ciliate, the cilia being stiff, very 

 oblique, and subpersistent nearly to the apex, in marked contrast to 

 S. watsoni. 



