Eu-Floridefe, Halarachnionese, Halarachnion. 1653 



HALARACHNION Kuot/. [1813] IMiyf. <rener. p. 3!)4, Si). (IKl!)) p. 721 

 excl. s|)('c. (I^:tyiii. Iuds m;ir(3 et arachne araiiea), V.\vj,\. & Prantl 

 N;itiirl. IMLiiizeiilaiii. (lSII7j p. 514, Ilalt/nienia Hect. Ilalarachnion 

 J. A^^ l*]pi('r. p. 13!), Ulca', Platomm, Faci, Hali/menim, Dumon- 

 ti(V sp. auct. — Froiis coinplatiata aiit plana quasi foliacea, rarius 

 teretiuscula, siinplex aut rurcatiiu vel vage divisa et prolifera, 

 iiitus plus iniuus tubuloso-laxa. Stratuin medullaro crassum, ssepe 

 valde laxum, fiiis ramosis tenuibus constans rhizoidibusque parcis 

 percursum; stratum corticale tenue, cellulis interioribus majoribus 

 laxe dispositis, exterioribus minoribus denseque coalitis. Sporangia 

 ignota. Cystocarpia sp;irsa, onniino immersa, corticis poro pertusi 

 lateri interiori adfixa. Gonimoblastus in stratum medullare pene- 

 tniiis, rotundato-multilobus, lobis evolutione simultanea ortis. An- 

 tlieridia in rainulis siilitilissimis sita, cellulas ininiitissimas si- 

 stentia. 



Obs. Rarni carpogonii interiori lateri corticis adtlxi, arcuati, 

 s;t'pius 3-celIulares. Celluhe auxiliares numeroste, e cellulis majo- 

 ril)us corticis intorioris formatLe. 



1. Halarachnion ligulatum (Woodw.) Kuetz. Phyc. gon. t. 74, f. 1, 2597 

 Sp. p. 721. Tab. Phyc. XVI, t. 84, Buffham Anther. Florid. (1893), 

 p. 290, t. 14, f. 37-39, Ulva ligalata Woodw. in Linn. Transact. 

 III, p. 54, Engl. Bot. t. 420, Halymenia ligulata Ag. Sp. p, 210, 

 Syst. pag. 244, Grev Alg. lirit. pag. 162, tab. 17, Harv. Phycol, 

 t. CXII (excl. syn.), J. Ag. Sp. II, p. 201, Epicr. p. 139, Florid. 

 Morphol. t. 5, f. 4-5, Born. et Thur. Not. algol. p. 44, Hauck Meeres- 

 algen p. 127, f. 49 et 47 (cystoc), Ulva ruhra Huds. Engl. Bot. 

 t. 1627, Dumontia in(vqualis Lainour. (fide Kuetzing), Ulva furcata 

 Ag. Syn. p. XXII, Platoma hi/menophylla Schousb. Alg. n. 309, 

 Icoii. iiied. t. 421-422. — Fronde gelatinoso-membranacea, incras- 

 sato-plaiia, stipitata, siinpliciuscula, laciniata aut dichotoma, a mar- 

 gine et (s;epe quoque) a disco [linntititn prolifera decomposita, pro- 

 lificationibus elongatis linearibus utrinque attenuatis simplicibus 

 ;iut iterum dichotomis. 



Ilatj. in oceauo Atlantico a littore Helgolandiae et Orcadura 

 us(iue ad Tiugin Afric;e (ScHOUSBOii). — Frons a radice scutata 

 surgetis, stipite plus niinus evidenti, sensim in laminam abeuiite, 

 pollicem longa aut usque biped;ilis, nunc linearis, circ. 2 mm. I;ita, 

 ex cylindraceo compressa, nunc 6-9 cin, lata et omnino plana. 

 Ramiflcatio semper dichotoma, sed in formis latioribus subpalmata, 



