Ser. CiiLouosPERME^. Tarn. Sipltonacece. 



Plate CXXV. 



HALIMEDA INCRASSATA, Lain.v. 



Gen. Char. Boots fibrous, much branched. Frond dendroid, articulato- 

 constrictedj with flattened internodes (or articulations), coated with a 

 calcareous crust, and composed internally of a plexus of longitudinal, 

 subparallel, unicellular, branching filaments. — Haltmeda {La7iiour.), 

 from one of the Nereids. 



Radix fbrom, ramosissima. Frons dendroidea, articidato-constricta, internodus 

 (articidisve) plauiuscuUs, crustd calcared C07'ticata, intiis ejilis lontjitudinalibus 

 mbparallelis intertextis unicellularihus ramosis eomposita. 



IIalimeda incrassata ; frond subsolitary, erect, flabeUiform, distichously 

 much branched ; articulations thickened, the lowest compresso-terete, 

 quadrate; the medial cuneate; the upper compressed, obscurely re- 

 pando-crenate, or oblong and moniliform. 



H. incrassata ; fronde suhsolitaria erecta flahdliformi disticlie ramosissima, arti- 

 culis incrassatis, inferiorihus compresso-teretihus quadratis, mediis cmieatis oh- 

 lovgisve, snperioribus nunc repaitdo-crenatis nunc obloncjis ad genicula monili- 

 formiter constrictis. 



Halimeda incrassata, Lamx. Exp. Meth.p. 25; Polyp, p. 307. Kiitz. Sp. 

 Alg.p. 504. Harv. Ner. Bor. Amer.pars 3. p. 24. 



Halimeda monilis, Lamx. I.e. Kiitz. Sp. p. 505. 

 Flabellauia incrassata, Lamarck, An. Mus. v. 20. p. 302. 

 CoRALLiNA incrassata, Mils et Sol. 2}. 111. t. 20 d. 

 CoRALLiNA monilis, Mlis et Sol. p. 110. t. 20 C. 

 Hab. On (dead) coral reefs. Albany Island, tropical Australia. Dr. 

 Ferd. Milller. 



Geogr. Distr. Coramon on the coral reefs of the tropical Pacific. West Indies. 

 Keys of Florida. 



Descr. Root, a compact, intricately interwoven mass of slendei-, branching fibres, 

 as large as a pigeon's egg, or larger. Frond solitary, or tAvo or three from 

 the same base, 4-8 inches high, fiabelliform in outline, fastigiate, snbtricho- 

 tomously branched or polychotomous, all the branches and their divisions 

 erect, gradually attenuated towards the extremities. Articulations very 

 thick, quadrate or oblong, or the medial obscurely cuneate, the lowest most 

 terete, the upper more compressed ; the lowest 3-4 lines in breadth, the 

 upper 1-2 lines, the very uppermost scarcely a line broad. The uppermost 

 ramnli are sometimes bead-sliaped, with much contracted nodes ; sometimes 

 flattened, and a little separate. Colour, when growing, a yellowish-green. 



