374 BULLETIN OF THE BUREAU OF FISHERIES. 
than have the other forms of plants and organs of reproduction. Svedelius (1908, 1912) 
has shown that, in Martensia and Delesseria sanguinea, the male plants have an exceed- 
ingly short duration, in the latter species not more than one month. Miss Dunn (1917) 
has called attention to the fact that, in Dumontia filiformis on the coast of Maine, the 
male plants are found only during a few weeks in the spring. A similar scarcity of 
male plants has been observed by the author for many species at Beaufort. In spite 
of extensive searches for them, no male plant of Gracilaria confervoides has been 
observed, and none of Gracilaria multipartita has been found in the harbor; only one 
male plant of Hypnea has been found among the hundreds examined; and male plants 
of Chondria are rare. Many other instances of the same kind might be given. While 
further search might show these to be more abundant than is indicated here, it seems 
to be true that, with the exception of a few species, male plants and organs are much 
scarcer than are the other forms of plants and organs. Because of this fact, anyone 
finding male plants or organs of a species in which they are not described in this work, 
should save these for study, or should send them to some other student of the alge. 
Among the Phaeophycee and Rhodophycee all determinations have, as far as 
possible, been verified by comparison with type or authentic material. Among the 
Myxophycee the determinations have been made entirely and among the Chlorophycee 
they have been made largely by Mr. Frank S. Collins. Under each species references are 
given to the original place of publication; to the most recent general account of the 
alge, the Sylloge Algarum of De Toni (1889-1907); and to the works of Harvey (1852- 
1858), Farlow (1882), Collins (1909, 1912, 1918), and Miss Tilden (1910), these being the 
publications of a more or less general nature dealing with North American alge. Ina 
few cases other references of special interest are given. Citations are given, also, to the 
two principal sets of American alge, the Algae Americane Boreales Exsiccate (A. A. B. 
Ex.) of Farlow, Anderson, and Eaton, and the Phycotheca Boreali-Americana (P. B.-A.) 
of Collins, Holden, and Setchell. With some exceptions, where the works cited were not 
available, all references have been verified. The arrangement used follows, in most 
respects, that of Engler and Prantl (1897—1911),? except in the Chlorophyceze, where 
Collins (1909, 1912, 1918) has been followed. The system of nomenclature follows the 
Vienna and Brussels rules except in the naming of the divisions, where Chlorophycee, 
etc., have been used. The retention of these names seems justified by usage, conven- 
ience, and uniformity, and, although not yet acted upon by any congress, seems to 
come under the principles of nomina conservanda. 
Those wishing to know more than is given here about the structure of the alge 
mentioned should consult Oltmanns (1904-5) and Engler and Prantl (1897-1911), where 
are summed up the main facts about the structure of alge known at the time of their 
publication. 
A work of the present nature necessarily has a limited usefulness and should be 
replaced by an account of the alge of our entire coast. If the present report contributes 
toward the preparation of the larger work and serves in the meantime to forward the 
study of the alge of our Atlantic coast, it will have served its purpose. 
@ While this arrangement is inconsistent and apparently wrong in many respects, we have not yet sufficient knowledge to war- 
fant a complete revision, and must, accordingly, use it until we obtain more information about the life histories and structures of 
the various groups of alge. 
