boii 
1910] RIDDLE—STEREOCAULON 291 
MASSACHUSETTS: rine ae E. er in Dec. N. A. L. 26; 
South Sudbury, C. M. r (R); Ipswich, Wm. Oakes (Tuck); Duxbury, 
J. L. Russell (Tuck); — Toe y. Willey (BSNH); Mattapoisett, H. 
Willey (R). 
Connecticut: Montville, W. A. Setchell (Tuck); Norwich, W. A. Setchell 
(H). 
The differences which distinguish this species from S. pileatum are suffi- 
ciently indicated in the notes under the latter, to which reference may be made. 
Sect’on EUSTEREOCAULON 
Primary thallus soon disappearing;' podetia mostly tall, well 
developed, and irregularly branched; squamules well developed, 
cartilaginous, gray or white, but never chalky.—Spores 15-35X 
2.5-5, with some minor variations among the species, but on 
the whole so uniform as to be without value in specific diagnosis. 
3. STEREOCAULON CORALLOIDES Fries. 
S. coralloides Fries Lich. Suec. no. 118. 1817; and-Sched. Crit. p. 24. 1824. 
S. corallinum Laurer in Fries Lich. Eu. p. 201. 1831. 
S. corallinum Fries in Tuck. Syn. Lich. N.E. p. 45. 1848. 
S. Despreaultii Delise ms. in Nyl. Syn. p. 249. 1858 (according to authentic 
specimen in Herb. Tuck.). 
Podetia solitary or caespitose, erect, branched, usually exten- 
sively, glabrous or subtomentose; squamules coralline and branch- 
ing, giving the plant a fibrillose appearance; apothecium medium 
to large (1-4 mm.), mostly terminal;] cephalodia of the type of 
S. paschale (q.v.), usually abundant and conspicuous.—Growing 
on rocks (fig. 5). 
SPECIMENS EXAMINED 
Europe: Fries Lich. Suec. no. 118; Stenh. Lich. Suec. no. 82; Sweden, 
Th. Fries, Leighton Collection (NY), also Nylander (loc. cit.); Schaer. Lich. 
Helv. no. 261; Hepp Lich. Eu. no. 114; Pyrenees, R. Spruce in Leighton 
Collection (NY). 
British America: Labrador, Townsend July 1906 (H); Newfoundland, 
Waghorne no, 46, no. 66 as S. tomentosum, no. 67 as S. paschale (CEC); New 
Brunswick, Farlow July 1892 (H);. Willey (Tuck); Cape Breton Is., Macoun 
July 22, 1898 (Can); Nova Scotia, 4. H. Mackay (BSNH); Ontario, Macoun 
); Lake Superior, Macoun (Can); Vancouver Is., Macoun (Can); Calder 
(BSNH); Lyall (Tuck). 
ALASKA: Unalaska, J. M. Macoun June 4, 1897 (Can); St. Paul Is., 
J. M. Macoun June 19, 1897 (Can). 
