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viii
ZYGNEMATACEAE
omitted because of faulty descriptions. Also some recent descrip-
tions have had to be passed over because they lacked important
details, or because of discrepancies between figures and descriptions.
I have no doubt that some of these species are valid, and
if additional information could have been obtained, they would
have been included. No attempt has been made to guess at the
synonomy of all previously published species names. Such guesses
can be found in the Sylloge Algarmn by G. B. de Toni (1889), in
the Siisswasserjiora Mitteleuropa, 9 (1932), and in Rabenhorst's
Kryptogamenfiora, 13 (1941-44), abt. II. In the absence of
complete descriptions, or of the actual specimens, such conjectures
seem gratuitous. Synonyms that are the result of different con-
cepts of generic or specific limits are usually given. A few species
with incomplete descriptions, but with conspicuous structures
that distinguish them from other somewhat similar species, have
been retained.
Among the many friends and students who have contributed
collections containing Zygnemataceae, I am particularly indebted
to Alma Ackley, Wayne University; Charles C. Adams, New
York State Museum; D. B. Anderson, Agricultural and Technical
College of North Carolina; the late W. M. Barrows, The Ohio
State University; Glenn W. Blaydes, The Ohio State University;
E. T. Bodenberg, Wittenberg College; Harold C. Bold, Vander-
bilt University; Helen B. Bromley, Stamford, Connecticut;
Charles Bullard, late of Harvard University; C. Cedercreutz,
Helsingfors, Finland; Glenn Couch, University of Oklahoma;
Francis Drouet, Chicago Natural History Museum; R. B. Gordon,
Westchester Teachers College; Lawrence Hicks, Columbus,
Ohio; Elwyn Hughes, University of Oklahoma; G. J. Ikenberry,
Oklahoma Agricultural and Mechanical College; Chin-Chih Jao,
Chungking, China; Minnie M. Johnson, Stephens College; Ivey
Lewis, University of Virginia; Liang Ching Li, Fan Memorial
Institute of Peiping, China; Floyd A. McClure, Lingnan Uni-
versity; B. B. Mclnteer, University of Kentucky; George Nichols,
late of Yale University; Claude E. O'Neal, Ohio Wesleyan University;
Gerald Prescott, Michigan State College; M. S. Rand-
hawa, Fyzabad, India; H. C. Sampson, The Ohio State University;
H. Skuja, Uppsala University, Sweden; Ben H. Smith, Indiana
State Teachers College; G. M. Smith, Stanford University; Edith
L. Stephens, University of South Africa; E. L. Stover, Eastern