SIPHONACE^. 27 



The structure, after removal of the lime, is seen to consist of closely packed, parallel, 

 longitudinal, unicellular filaments, branching and interlaced together, and emitting 

 toward the surface, or periphery, short, horizontal, rootlike, fastigiate, branching pro- 

 cesses, of whose cohering apices the surface of the frond is composed. Colour, a pale 

 grass green, bleaching to a dirty white. 



2. Udotea conglutinata, Lamour. ; stipes short, simple, smooth, expanding into a 

 broadly flabelliform, simple or lobed, flat, scarcely incrusted, strigose frond, composed 

 of longitudinal, parallel, agglutinated, dichotomous filaments, constricted at the furca- 

 tions. Lamour. Pol. Flex. p. 312. Kiitz. Sp. Alg. p. 502. Corallina conglutinata, 

 EU. and Sol. p. 125, t. 25, fig. 7. Udotea Palmetta ? Dne. p. 93. (Tab. XL. C.) 



Hab. Key West, W. H. H. (v. v.) 



Root deeply descending, long and fibrous. Stipe terete or compressed, about half- 

 an-inch to f inch long. Frond flabelliform, 1-2 inches broad, flat, cuneate or cordate 

 at the base, either entire or somewhat lobed, or irregularly torn, but slightly incrusted 

 with lime ; the filaments of which it is composed being everywhere visible, and giving 

 to the surface a strigose, fibrous appearance. These filaments are longitudinal, parallel, 

 conglutinated together, but readily separable when the lime has been removed by acid. 

 They are dichotomous, constricted at the forkings almost as if jointed, very slender, 

 and destitute of lateral horizontal annuli, or of rooting processes. They more resemble 

 the threads of a Codium than of a Udotea, and may almost be compared to those of a 

 Penicillus. ' 



I have not seen any authentically named specimen of Solander and Ellis's plant, but 

 have little or no doubt of the correctness of my reference. The strigose or filamentous 

 surface at once distinguishes our plant from C. fiabellata ; and Solander truly observes, 

 " We can plainly distinguish all the dichotomous branches" (filaments) " of this Coral- 

 line on its surface, which are each of them separately covered with a thin calcareous 

 substance full of pores ; these, by growing so close to one another, become glued or 

 united together by their covering." 



Plate XL. C. Figs. 1, 2, and 3. Udotea conglutinata, difierent varieties, the 

 natural size. Fig. 4. Portions of the branching, unicellular, constricted filaments of 

 which the frond is composed ; magnified. Fig. 5. Small portions of the same, more 

 highly magnified. 



