Ser, Ehodosperme^. Fam. Wrangeliacece. 



Plate LXX. 



WRANGELIA HALURUS, Haw. 



Gen. Char. Frond ^xioxxa, decompouucl^ articulated, one-tubed; the in- 

 teruodes naked or coated with minute cellules; the nodes clothed 

 with opposite or whorled, articulated ramelli. Fructification : 1, 

 cydocarps terminating short branches, involucrated by the upper- 

 most whorled ramelli, and consisting of tufts of pear-shaped, pedicel- 

 late spores and slender paranemata; 2, naked, triangularly parted 

 tetraspores, borne on the sides of the whorled ramelli. — Wrangelia 

 {Ag.), in honour of Baron Wrangel, a Swedish naturalist. 



Frons filiformis, decomposita, articulata, monosiphonia, nuda v. celluUs corticata, 

 verticillis ramellorum ad genicula onusta. Fruct. : 1, cystocarpia 7'amos ter- 

 m'mantia, ramellis siipremis involucrata, fuscicuUs nuinerosis sporarum pyrl- 

 formium pedicellatarum et paranematlhm temiibus constantia ; 2, tetrasporce 

 nudce, triangule divisa, ad ramellos sessUes. 



Wrangelia Halurns; frond flaccid, membranaceo-gelatinous, pellucidly 

 articulate, irregularly branched ; branches patent, subsimple, tapering, 

 whorled at each joint with di-trichotomous, incurved, imbricated 

 ramelli ; axils rounded ; articulations of the stem 3-4 times, of the 

 ramelli cylindrical, 10-13 times as long as broad, the terminal cell 

 obtuse ; cystocarps terminating short branches; tetraspores pedicellate, 

 clustered round the joints of the ramelli. 



W. Halurus ; fronde flaccida molli pellucid e articulata vage ramosa ; ramis paten- 

 tibus simpliciusculis attenuatis per totam lovgitudbiem ramellis incuj-vis dl-tri' 

 c/iotosim imbricantihus verticillatis ; axillis ramorum rotundatls ; articidis 

 ramorimi Z-^-plo ramellorum cylindraceis 10-12-jo^o diametro longioribus, 

 celtula idtima obtusa ; cystocarpiis ramos abbreviates terminantibus ; tetra- 

 sporis pedicellatis ad genicula 7-ameUorum fasciculatis. 



Wrangelia Halurus, Harv. Alg. Austr. Exsic. n. 263. 



Hab. On the stems of the larger Algee, and on Cymodocea antarctica : 

 Tremantle, and Eottnest, and King George's Sound, W. H. H. and 

 G. Clifton. Port Pairy, Port Phillip, and Western Port, Victoria, 

 JF. H. IL 



Geogr. Distr. West and south coasts of Australia. 



Descr. Fronds originating in decumbent or creeping surculi, which lie along the 

 plant to which this Alga attaches itself, and are affixed by clasping discs. 

 Sterns three to six inches or more in height, sparingly and very irregularly 

 branched ; the branches alternate, secund, or subopposite or forked, usually 

 simple, worm-like, curved, tapering to a slender point, articulated through- 



