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EXCHANGE DEPARTMENT 
Offerings — To Society members only. Return postage, rather than a 
stamped envelope, should be sent. 
Rev. H. Dupret, Seminary of Philosophy, Montreal, Canada. — Drepano- 
cladus aquations (Sanio) Warnst., and D. capillifolius (Warnst.) Warnst., from 
the neighborhood of Montreal. U. S. postage accepted. 
Mr. Edward B. Chamberlain, 18 West 89th Street, New York City. — 
Ectropothecium Penzigianum Fleisch. st. from Java. 
Miss Caroline C. Haynes, Highlands, New Jersey. — Anthoceros Macounii 
M. A. Howe, collected by Miss A. Lorenz, and Herberta adunca (Dicks.) S. F. 
Gray, collected in Wales by Messrs. James, Wilson, and Rhodes. 
O. E. Jennings, Carnegie Museum, Pittsburgh, Pa. — Hedwigia albicans 
(Web.) Lind., north end Long Lake, n. w. Ontario, July 14, 1917, and Caloplaca 
cerina (Ehrh.) Zahlbr., on aspen, Jellicoe, n. w. Ontario, Aug. 2, 1917. Col- 
lected by O. E. and G. K. Jennings. 
Miss Daisy Levy, 403 West 115th Street, New York City. — Sphagnum 
Girgensohnii Russow, collected by Miss Daisy Levy, in Maine. 
