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 sanguined, 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 algae. 



Among the Phaeophyceae and Rhodophyceae all determinations have, as far as 

 possible, been verified by comparison with type or authentic material. Among the 

 Myxophyceae the determinations have been made entirely and among the Chlorophyceae 

 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 

 algae, 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 algae. In a 

 few cases other references of special interest are given. Citations are given, also, to the 

 two principal sets of American algae, the Algae Americanae Boreales Exsiccatae (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 Chlorophyceae, 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 Chlorophyceae, 

 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 algae 

 mentioned should consult Oltmanns (1904-5) and Engler and Prantl (1897-1911), where 

 are summed up the main facts about the structure of algae 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 algae 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 algae of our Atlantic coast, it will have served its purpose. 



o While this arrangement is inconsistent and apparently wrong in many respects, we have not yet sufficient knowledge to war- 

 rant a complete revision, and must, accordingly, use it until we obtain more information about the life histories and structures of 

 the various groups of algae. 



