142 « OLLINS \\i> ii!.i;\ i v. 



in the same plant'; these branches are of _' or 3 orders, the ultimate 

 about 12 p diani., the cells about 2 diam. long, codes more or 

 constricted; the end cell is distinctly acuminate or subulate. "I>ru- 

 senzellen" arc abundant, borne usually <>n the inner side of the lower 

 cell of an ultimate branch, in the same way as a tetrasporangium; they 

 an- spherical, about 20 p diam.. or slightly elongate, I s X 24 p, with 

 rather thin wall, strongly refringent, yellowish or pale aeruginous 

 content-. ( Occasionally the cells of a branch or of a system of branches 

 assume a spherical form, as it' becoming seirospores, but the contents 

 do not seem to become darker or denser; the end cell round- the lower 

 end. l»nt remains pointed above. Xo fructification was observed. 

 The plant is very small, the axis seldom over 1 em. long, the branches 

 hardly 1 mm.; it is possible that this is not the variety radicans of 

 J, <i. Agardh, of which we have not seen type specimens. Descrip- 

 tions a- far a- we know have beeD short and imperfect, which ha- led 

 u- to describe the Bermuda plant in rather full detail. 



( Irouani v -I. (i. Agardh. 



C. attenuate (Bonnem. -1. (i. Agardh, L842, p. 83; Barvey, 1853, 



p. 226, PI. XXXI. I); P. B.-A., Xo. -'ins; Batrachospermum attenua- 

 tion BonnemaisoD in Agardh, L824, p. 51, as synonym under Mcsogloia 

 attenuate. Very young plants on Caulerpa, Harris Bay, Jan., Xov., 

 plant- ii]) to 1 dm. high, washed ashore, Buildings Bay. Feb., March, 

 Hervey. 



Spyridia Harvey. 



1. Brandling mostly distichous. 3. 8. oomplanata. 



1. Branching radial. 2. 



2. Recurved prickles at ends of rainuli. 2. S. aeuleata. 



2. No recurved prickles. 1. S. Qlamentosa. 



1. S. FTLAMENTOSA (Wulf.) Harvey in Hooker, 1833, p. 



Harvey, L846 51, PI. XLVI; P. B.-A., No. L897; Fucus filamerUonu 

 Wulfen, L803, p. 64. Kemp; Tucker'- Town. Feb., Harrington 

 Sound, Jan.. Feb., Xov., Ilcncy. Abundant, probably everywhere 



about the islands. Occasionally hand-omc plants can lie found, hut 

 they are mostly matted and unal tractive. The three -pecics of 



Spyridia are much alike in hal.it; bul generally easily distinguished 

 on microscopic examination. 



2. S. kCULEATA Schimper) Kutzing, L843, p. 327; L862, PI. LI; 



