Eu-Floride<», Polysiphoniete, Polysiphonia. 91B 



Syst. p. 156, Sp II, p. 60, Broussonetia nigrescens Grat. (fide 

 specim. authentici ('. Agardhio a Grateloup missi), Poli/siphonia 

 multifida Duby Bot. Gall. pag. 966, Polysiphonia tinctoria Za- 

 nanl. (fide J. Ag.). — Fronde decomposito-rainosa ramulisque in- 

 terspersis obsita, usque in ramos superiores corticata; ramis vir- 

 gatis adscendentibus, ramulis patentioribus longiusculis mollioribus 

 a basi longe attenuatis, articulis diametro sequalibus aut sesqui- 

 longioribus ad genicula subcontractis ; tetrasporangiis in apicibus 

 ramorum distorto-flexuosis sparsis; cystocarpiis late ovatis, iu ra- 

 mulo sessilibus. 



Hab. in sinubus substagnantibus maris Mediterranei, ad littora 

 Galloprovincise (Giraudy, Solier) ; in mari Adriatico (Hauck) ; in 

 oceano Atlantico ad littus Amer. septentr. (Harvey). — Caaspes 

 6-10 cm. longus, nonnumquam elatior. Fila primaria nunc fere 

 penna? passerinoe crassitiem aequantes, ramis lateralibus decomposita 

 et usque in tenuitatem capillarem apice reducta. Rami consimiles 

 ramulique minores per totam longitudinem interinixti; rami ad- 

 scendentes, interjectis articulis 4-6 sejuncti; ramuli patentiores, 

 plus minus densi a basi longe attenuati, molliores, apice nudiu- 

 sculi aut fasciculis fibrarum lateralibus et terminalibus penicillati. 

 Articuli in fronde primaria et ramis majoribus ob genicula obscu- 

 riora quidem distinguendi, diametro sequales aut sesquilongiores, 

 externe autem corticati cellulis minoribus, in superficie (si ex ex- 

 siccata hoc dijudicare licet) hinc rugulosa prominentibus, intra 

 stratum corticale conspicuum siphones 4 circa centralem in se- 

 ctione transversaii offerentes ; articuli ramulorum nudiusculi, dia- 

 metro vix asquales, siphonibus 2-3 oculo conspicuis. Genicula, si 

 microscopio observantur, leviter contracta apparent. Tetrasporangia 

 in superioribus ramis ramulisque distorto-flexuosis evoluta, admo- 

 dum sparsa, ita ut vix plus quam 2-3 in eodem ramulo conspi- 

 ciantur. Cystocarpia sunt pro ratione plantee minuta, ramulis cras- 

 siora, rarius vero angustiora, in ramulis evoluta et horuni supra 

 medium sessilia, late ovata fere giobosa, singula aut plura. An- 

 theridia (sec. Harvey) ovato-lanceolata, in ramulorum apice fasci- 

 culata. Color purpureo-fuscescens, exsiccatione griseus aut nigre- 

 scens. Consistentia fere carnosa. In aqua facilius reviviscens. E 

 comparatione descriptionum et iconum, a Kuetzing pro Polysiphonia 

 ftcniculacea, a cl. Harvey pro Poltjsiphonia ramentacea exhibi- 

 tarum, suadente quoque synonymia, ab illustri J. Agardh allata. P. 

 hirtam, speciem sui juris esse dubitans, P. foenicalacecc adscripsi. 



