1910] RIDDLE—STEREOCAULON 301 
SPECIMENS EXAMINED 
Europe: ‘Authentic specimen ex Herb. Floerke in Herb. Tuck.; Fries 
Lich. Suec. no. 346; Arnold Lich. Exs. no. 1576; Sweden, Forssell 1880 (NY); 
Scotland, Leighton July 1869 (NY); 
France, L. Breviere (R). 
BritisH AMERICA: Greenland, Eber- 
lin 1885 (Can); Warming and Holm 1884 
(H); Kikkeston Is., Howgate Exped. 1877 
(Tuck); Hudson’s Strait, R. Bell 1884 
(Can); Labrador, Wm. Palmer 1887 
(NY); Owen Bryant Aug. 22, 1908 (H); 
Newfoundland, no collector given 
(BSNH); Delise (Tuck) not typical. 
New HampsuirE: White Mts., Tuck- 
erman Lich. Exs. no. 114; Mt. Washing- 
ton, W. G. Farlow Sept. 1891 (H); Mt. 
Adams, W. G. Farlow Sept. 1897 (H); 8 
Mt. Willard, E. Faxon June 1882 (CEC); 
ae Monadnock, W. G. Farlow July 1896 
) 
VERMONT: C.C. Frost (BSNH); Mt. Nec 
Mansfield, W. G. Farlow Sept. 1890 (H). 9 
New York: Mrs.C. W. Harris June 
it : —Fig. 7, palmate- 
1900 (R); Adirondack Mts., W. G. Farlow Fics. 7, 8, 9—Fig. 7 ca 2 
digitate type of squamules foun in 
Sept. 1902 (H). S. paschale and S. tomentosum; en- 
MassacuusEtts: Mt. Holyoke, Whit- larged; fig. 8, typical squamules 
man May 20, 1839 (Tuck). of S. coralloides; enlarged; fig. 9, 
Minnesota: B. Fink no. 49 inHerb.  squamules of S. denudatum; right, 
WASHINGTON: Suksdorf (BSNH). umbilicate type; left, granular type; 
ALIFORNIA: Bolander in Herb. Tuck. _ enlarged and semi-diagrammatic. 
(doubtful!). 
ALASKA: Dr. Kellogg 1867 (Tuck); W. A. Setchell, Univ. Calif. Exped. 
1899 (CEC); W. H. Evans 1897, as S. alpinum (CEC); Harriman Exped. 
no. 1279, as S. alpinum (CEC). 
The two types of squamules described for this species intergrade, snd: the 
granulate type is scarcely worthy of varietal rank. The typical umbilicate 
Squamules are found in specimens from arctic or subarctic stations. When 
these are present there should be no difficulty in distinguishing S. denudatum 
from all other species. But specimens with the coarsely granular squamules 
are less distinctive, and are frequently mistaken for either S. paschale or S. 
alpinum. From the latter the wholly glabrous podetia and the type of anton 
lodia should serve to distinguish S. denudatum; while the error of mistaking it 
for S. paschale may be avoided if it is borne in mind that in true S. paschale 
