L32 ' l 'i.i i\> wi> in i;\ l 1 . 



March, Gibbet [aland, Dec., Hervey; Hungry Bay, April. ( oo] 

 [sland, Aug., Little Agar*s [aland, Nov., Collins. On Gelidium and 

 other algae, but most frequently on Sargassum; a careful search would 

 probably discover it in am lot of old Sargassum, but it is seldom found 

 in large quantity. 



Fuiin CERAMIACEAE. 

 Spi km< > i ii imnion Areschoug. 



1. Cell- 5-20 (limn, Long; tetraspores usually in corymbose clusti i 



:;. s. macroii 

 1. Cells 2-7 diam. long; tetrasporee solitary. 2. 



2. Filaments 15-20 p diam. 1. S. investiens. 



2. Filaments 40-50 p diam. 2. 8. gorgoncunn. 



1. S. [NVESTiENS (Crouan) Vickers, 1905, p. 64; Callithamnion 

 investieru Crouan in Maze 1 & Schramm, L870-1877, p. 141. On 

 Galaxaura squalida, Gravelly Bay, April, St. David's Island. April, 

 Collins; Harris Hay, Dec., Hervey. The dimensions of the Bermuda 

 plant agree with those given by Miss Vickers for the Barbados plant; 



•!. L909, p. 17. fig. 10, describes and figures var. cidaricola from 

 the Danish West Indies; the dimensions are considerably larger than 

 in the typical form, but the habit and the tetraspores arc the same B£ 

 in the Bermuda plant. 



2. S. gobgoneum (Mont.) Bornet in Vickers, 1905, p. 64; Callith- 

 manion gorgoneum Montague, 1857, p. 289. Common on frond- of 

 species of ('odium. Tetraspores with tripartite division were found 

 in Bermuda material, borne on an upcurved pedicel. 



: } >. S. macromeres sp. now; P. B.-A., No. 2044. Filamentis pros- 

 tratis circa Ho// diam., cellulis 3-5 diam. longis, rhizoideis magnum 

 discum terminalem ferentibus, aflixis; filamentis erectis 5 s mm. 

 longis, basi circa 50 fx diam., sensim diminutis, in ramis ultimis circa 

 30 m; cellulis 5-20 diam. longis, cylindricis vel leviter clavatis, cellulis 

 ramiferis valide clavatis; ramificatione distante, apparenter dicho- 

 toma, a\i ramoque subaequalibus, minime divergentibus; tetraspor- 

 angiis in ramo lateral] evolutb, ramum vegetativum referente, vel in 

 ramis brevibus oppositis; ramis tetrasporangiferis raro simplicibus, 

 vulgo di- trichotome ad cellulam quamque repetite divisis, cellulis 

 brevibus, clavatis; tetrasporangiia terminalibus, tripartitis, 50-55 m 

 diam., globosis vel paullo elongatis, membrana crassa; antheridio 



