V. RHODOMELACE^. 53 



other species. Conceptades unknown. Tetraspores of large size, forming a single 

 row through the centre of the ultimate ramuli. Colours brownish red. Substance 

 soft, but not soon decomposing. In drying, the plant adheres closely to paper. 



A very remarkable species, abundantly different from any other North American 

 one known to me. I wish it to bear the name of Lieut. Wood, R. N., who, while 

 cruising in the Pacific Ocean in H. M. S. " Pandora," collected several interesting 

 Algae, which he communicated to Sir Wm. J. Hooker, in whose Herbarium I have 

 examined them. I have recently received from Mr. N. Pike of Brooklyn a Cali- 

 fornian specimen agreeing in all characters with Lieut. Wood's original one. 



26 PoLYSiPHONiA dictyurus, J. Ag.; filaments tufted (1-2 inches high) capillary, 

 rather rigid, sparingly branched; branches virgate, simple, set throughout with 

 short, pinnato-multifid, squarrose, quadrifarious ramuli, which are densely crowded 

 toward the ends of the branches ; internodes visible throughout, many-tubed, much 

 shorter than their breadth. Ki/tz. Sp. Alg. p. 838. 



Hab. Pochetti, Pacific Coast of the Mexican Republic, Liehman! (v. s. in Herb. 

 T. C. D.) 



Stem short, with a few lateral branches. Branches 1-2 inches long, laxly clothed 

 below, very densely set above with short pinnato-multifid ramuli one or two lines 

 in length ; the lowest of which are shortest and subsimply pinnate, the upper longer 

 and more compound, their pinnules once or twice forked or irregularly multifid. 

 Tubes about twelve in the stem. Colour under the microscope a dull browu. Sub- 

 stance rigid. It does not adhere to paper in drying. 



27. PoLYSiPHONiA thyrsigera, J. Ag. ; " two inches high, tufted, becoming very 

 black in drying, rigid; branches setaceous, virgate, above densely clothed with 

 curved acute, cymose or racemose, tetraspore-bearing ramuli (Carpoclonia, Kiitz.); 

 internodes of the branches thrice as short as broad, ten-tubed, of the fruit-bear- 

 ing ramuli twice as short." Kiitz. Sp. Alg. p. 838. 



Hab. La Guayra, Mexico, Liebman. 



I have not seen this plant, for which I adopt Kiitzing's description, slightly 

 altered. 



27. PoLYSiPiiONiA verticlllata, Harv. ; filaments sliort, creeping, setaceous, sparing- 

 ly branched ; l)ranches erect, densely beset on all sides with simple, incurved, acute 

 ramuli ; articulations many-tubed, much shorter than their diameter in the 

 branches, rarely as long as broad in the ramuli ; tubes ten or twelve. Harv. in 

 Bot. Beechey,p. 1G5 Kutz. Sp. Alg. p. 839. 



