THE ALGAE OF BERMUDA. 137 



March, Gravelly Bay, Feb., March, April, Hervey. At Pink Beach 

 this plant grew buried in fine sand, on an exposed rock; at Gravelly 

 Bay in the cave with C. byssoideum var. jamaicense, not as large nor 

 as well fruiting as at Pink Beach. . At that station it bore tetraspores 

 along the upper edge of the ramuli, as figured by Harvey; antheridia 

 in rounded tufts at the same points; cystocarps large, spherical to 

 ovoid, on opposite sides of a branch; the three on separate individuals. 

 Paraspores were often found at the ends of the ramuli, ovoid, of 

 varying size, up to 50 X 35 ^ including the rather thick wall. Tetra- 

 spores were occasionally found on the individuals producing the 

 paraspores, but no other organ of fructification. We saw no seriate 

 paraspores, such as are found in Seirospora Griffiihsiana Harv., but 

 sometimes two were side by side, touching each other, at the end of an 

 ordinary cell. Kylin, 1907, p. 152, figures and describes paraspores 

 of C. Hookeri, but of quite a different type; they take each the place 

 of a tetrasporangium, dividing to produce an indefinite number of 

 spores, "polyspores" of most authors. De Toni, 1903, p. 1317, 

 describes C. Hookeri with tetraspores and cystocarps, and vegetative 

 characters quite as above, and adds "Cautissime haec a Seirospora? 

 Gaillonii, quacum characteribus plurimis congruit, dignoscatur." 

 The latter species is described by him, p. 1352, by vegetative char- 

 acters and tetraspores only. There is practically no distinction as 

 regards these characters between the descriptions of the two species. 

 The final note under fi. Gaillonii is " Seirosporae et cystocarpia (sec. 

 Crouan) presentia." De Toni includes under Seirospora, with or 

 without a ?, a number of species which do not seem to us to belong to 

 that genus, and without any statement of his reasons for so assigning 

 them; among them Callithamnion byssoideum, with var. jamaicense 

 and three other varieties. 



C. COEDATUM Borgesen, 1909, p. 10, figs. 5-6; P. B.-A., No. 

 2189. Washed ashore. Buildings Bay, Feb., Hervey. Abundant, but 

 entirely sterile, so that the determination must remain doubtful, 

 although the vegetative characters agree with Borgesen's description 

 and figures. 



Gtmnothamnion J. G. Agardh. 



Plumaria Schmitz, not Stackhouse. The genus Plumaria was 

 founded by Stackhouse, 1809, p. 58, P. pectinata type, with synonym 

 Fucus plumosus Linnaeus. C. A. Agardh, apparently not knowing of 

 this publication, proposed, 1817, p. XIX, the genus Ptilota, founded 



