POLYCLADIA. — THYSANOCLADIA. EUCTENODUS. 769 



integris obtusis, ramis patentibus basi parum angustioribus pal- 

 maribus (flavescentibus) minutim denticulatis. — Fucus denticu- 

 latus Vahl, Naturk. Selsk. Skr. 5. 2. p. 45. — Ag. Sp. I. p. 334. 



— Ad ins. S. Crucis. 



512. POLYCLADIA. Mont. in litt. 



Phycoma filiforme ramosum ubique vestitum ramellis (carpo- 

 cloniis?) spiniformibus rigidis brevibus apice obtusis subincrassa- 

 tis. Structura parenchymatica, cellulis omnibus firmis, arcte con- 

 junctis, minoribus, medullaribus elongatis, diametro minori, ver- 

 sus peripheriam oblongo-ovalibus, corticalibus minulis polygoni- 

 micis granulosis rotundatis, substantia gonimica fusca replelis. 



P. Commersonii. Mont. — P. phycomate erecto rigido, fili- 

 formi, ubique echinato, crassitie pennae passerinae, tereti, ramis 

 alternis subdivisis, 3 — 4'" longis, erecto-patentibus, approximatis; 

 ramellis squarrosis numerosis apice incrassatis. Color purpureo- 

 fuscus, nigricans. — Fucus Commersonii Lamour. — In freto Ma- 

 gellanico (?). (v. s.) — Spec. dedit amic. Montagne. 



513. THYSANOCLADIA. Endl. Suppl. III. p. 44. 



(Lenormandia Mont. — Mammea /. Ag.) 



Phycoma cartilagineum lineare, subcostatum, pinnato-denta- 

 tum. Cystocarpia in superficie prope apicem pinnularum aggre- 



gatae. Tetrachocarpia Structura amphigeneta. Axis cen- 



tralis nullus. Stratum medullare longitudinaliter fibrosum, inter- 

 medium parenchymaticum, e cellulis majoribus oblongo-elJipticis 

 formatum, corlicale perenchymaticum, cellulis minulis monogoni- 

 micis in lineas axin .versus verticaliter drdinatis. 



Th. dorsifera. Kg. — Th. phycomate spithamaeo, crebre, tri- 

 pinnatifido, jugamentis linearibus, primario 2'" lato, obsolete co- 

 stato, superioribus sensim angustioribus et brevioribus subecosta- 

 tis, pinnulis inciso - serratis medio capsuliferis. Color atropurpu- 

 reus. — Rhodomela dorsifera Ag. Spec. I. p. 372. — Lenorman- 

 dia dorsifera Mont. — Mammea dorsifera /. Ag. Symb. I. p. 21. 



— Bonnemaisonia dorsifera Endl. — Ad oras Novae-Hollandiae. 

 (v. s.) 



514. EUCTENODUS. Kg. Bot. Zeitg. 1847. 



(Ctenodus Kg. Phyc. gener. p. 407. — non Aggasiz.) 



Phycoma cartilagineum diaphanum lineare ramosum, lalere 

 ciliato-dentatum, perigenetum, e stratis diversis tribus composi- 

 tum, pericentrali tenuissime et longitudinaliter fibroso, intermedio 

 e cellulis rotundis majoribus laxissimis, fibris curvatis intertextis, 

 corticali perenchymatico , e filis fasligatis composilo. Cystocarpia 

 e ciliis lateralibus orta, petiolata globosa. Tetrachocarpia (sec. cl, 

 KCtzing, Spec. Alg. 49 



