Ser. llHODOSPERMEiE. Fam. Cryptonemiacea. 



Plate CXCVII. 

 GIGARTINA ANCISTROCLADA, Mont 



Gen. Char. Frond carnoso-cartilagiiious, flat or cylindrical, simple or 

 variously branched, composed of two strata of cells ; the medullary 

 stratum, of cylindrical, articulated filaments, anastomosing into a 

 very lax network ; the cortical, of moniliform, vertical, dichotomous 

 filaments set in firm gelatine. Fnictifcaiioji : 1, external, globose, 

 finally perforate concept acles, containing within a saccate placenta (?) 

 formed of closely interwoven filaments, a compound nucleus consist- 

 ing of many confluent nucleoli, or masses of roundish-angular spores ; 

 2, cruciate tetrasjjores, collected into dense, subprominent sori, 

 lodged beneath the superficial cells. — Gigartina {Lamour.), from 

 yi'yaprov, a grape-stone, which the conceptacles resemble. 



Frons carnoso-cartilaginea, plana v. cylindracea, ramosa, ex stratis duotms 

 cellularnm compoaita ; stratum medullare ex Jills tenidbiis cylindraceis laxe 

 anastomosantitjus, corticale ex jilts moniliformihas verticalibus dicJiotoinis 

 formatum. Friict. : 1, favelUdla intra pericarpimn externum carpostomio 

 pertusum excepta, fili^ arachnoideis intertextis obvoluta ; 2, tetraspoj're cru- 

 ciatim divisce, in soros subprominentes infra stratum corticale nidutantes 

 plurimce collectce. 



Gigartina ancistroclada ; frond channelled on one side, convex on the 



other, linear, irregularly bi-tripinnate, distichous, pinnfe alternate or 



subopposite, often secund, the apices of the branches and ramuli 



strongly hooked inwards. 



G. ancistroclada ; fronde hinc convexa illinc canaUcidata lineari vage bi-tripln- 



nata d'lsticlia ; pinnis alternis v. suboppositis sape secimdis ; apicibiis omnibus 



uncinato-incurvis. 



Gigartina ancistroclada, Mont. Prod. Fhyc. Ant, p. fi ; Voy, av, Pule ^ud, 



p. 121. t. 7. /. 4. Kiitz. Sp. Alg. p. 751. /. Ag. Sp. Alg. v. 2. /;. 272. 



Harv. Alg. Austr. Exsic. n. 401. Ilarv. in Hook.f. Ft. Tasm. v. 2. p. 32.5. 



IIab. Brown's Eiver, Tasmania, R. Gunn, Br. Lyall. 



Geogr. Distr. Tasmania. New Zealand. 



Descr. Root discoid. Frond 2^-3 inches high, shortly stipitate, from a line to 

 a fine and half in breadth, hiicar, convex on one side, clianiiellcd by an in- 

 rolling of the margin on the other, pinnatcly branched or bi-tripinnate. 

 Pinnae often secund, sometimes fasciculate, but normally alternate, rarely 

 subopposite, incurved or recurved, the lowest longest, the rest gradually 

 shorter to the point. Pinnides more commonly secund than the pinna), in 

 other rcs[)ects siraflar. All the apices arc strongly inrolled. Colour a ilull 

 brownish-purple, fading to horny and greenish, especially in exposed spcci- 



