lMi-Floride£o, Caiil.-ieantlica!, Caulacautlius. 1-11 



CAULACANTHUS Kuotz. [1843] Phyc. ocn. p. 395, Sp. (1849), p. 753 

 (Etyin. caulos caulis ct acanthos spiua) J. Ag. Sp. 11, p. 432, Epicr. 

 p. 578, Boru. & Thur. Not. Algol. I, p. 55, t. XIX, Ardiss. Phyc. 

 Medit. I, p. 292, Schmitz et Hauptll. in Engl. & Prantl Natiirl. 

 Pflanzenfam. 142 (1896), p. 34G, Olhia Mont. [1846] Fl. Algor. 

 p. 126. — Frons erecta, plerumque teretiuscula, ramosissima, fere 

 aculeata, juvcnilis subtubulosa quasi filis contexta, adulta cellulosa, 

 nempe axi monosiphonio articulato flexuoso alterne in ramos di- 

 polychotomos, strato corticali sul)ceIIuloso terminatos excurrcnte. Cy- 

 stocarpia minuta, infra apices ramuJoruni intumescentia, intra stra- 

 tum periphericum circumcirca prominulum innnersa, carpostomio 

 laterali munita, nucleum subcompositum foventia, nucleolis circa 

 placentam, filis incrassatis anastomosantibus contextam, radiatiui 

 dispositis, filis sterilibus (vix conspicuis) fere nullis invicem sepa- 

 ratis, filis carposporiferis fasciculatis invicem liberis clavatis, peri- 

 pheriam versus radiantibus coustitutis ; carposporte in articulis ter- 

 minalibus singuke obovato-oblongxe. Tetrasporangia inter fila pe- 

 ri[)herica magis evoluta numerosa, zonatim divisa. 



Ol)s. De habitu et structura Caulacanthi sequentia docet illu- 

 stris J. Agardh (Sp. II, p. 432). — Frondes puIvinato-ca3spitosie, 

 intricato-ramosissimae, filiformes et minuta^, ramulis patentissimis 

 divaricatisque subulatis in ramos sensim excrescentibus densissime 

 obsitie, purpureo-fuscescentes, exsiccatione fere nigricantes, recen- 

 tes subcarnosie, exsiccatte fere cartilagiuece. Structura in partibus 

 juvenilibus et adultis valde diversa: in juvenilibus frons tubulosa 

 axi centrali monosiphonio articulato, endochroma coloralum intra 

 tubum hyalinum fovente, percurritur; rami ex hoc egrediuntur ple- 

 rumque alterni, prope axin simplices, mox poly-trichotomi et pe- 

 ripheriam versus dichotomi, corymboso-fastigiati, articulati, arti- 

 culis intra tubum laxum hyalinum endochroma cylindraceum seu 

 sursum dilatatum foventibus, terminalibus rotundato-oblongis; adul- 

 ta frons tota cellulosa; rami enim ex axi egredientes ita densi ut 

 articuli cellulas subcontiguas efficere adpareant; cellula3 rotundato- 

 oblongae, periphericaj minores, omnes endochroma coloratum fo- 

 ventes. 



1. Caulacanthus ustulatus (Mert.) Kuetz. Phyc. gener. p. 395, Sp. 2(35 

 p. 753, Tab. Phyc. XVllI, t. 8 a-c, J. Ag. Sp. II, p. 433 (incl. var.), 

 Epicr. p. 580 (excl. var. spinetla), Ardiss. Phyc. Medit. I, p. 293, 

 Hauck Meeresalgen Deut. u. Oesterr. p. 197, f. 85, Schmitz e^ 



