S£R. GONGYLOSrEKME^. ( 1(J1 ) I-'am. CEIUMIACEtE. 



Plate CXX. 

 CALLITH AMNION BnOBlMl.—Ilarv. 



Gen. Char. — Fronds filiform and articulated, sometimes at lengtli in tlie older parts 

 cellular and partially opaque, single-tubed ; divisions mostly pinnate, dissepiments 

 hyaline. Fructification of two kinds, on distinct plants : 1. Favellse, mostly 

 lateral on the brauches, and filled with minute spores ; 2. Tetraspores, external, 

 tripartite or cruciate. Name from Ka\hs, " beautiful," and Banvos, " a shrub." 



Caluthamnion Brodmi — "Stem subopaque, veiny, obscurely jointed, 

 slender, simple, furnished tlii'ougliout with densely inserted, patent, 

 lateral branches, furnished at each joint with short quadrifarious 

 secondary branches, with a narrow hastate outline ; plumules alternate 

 subsimple, pinnate, ovate, their pinnules patent, frequently with a few 

 secund processes near the apex ; tetraspores oval, sessile near the tips of 

 the pinnules, or on their accessary processes ; favellse bilobed on the 

 secondaiy branches." — Phyc. Brit. 



Callithamnion Brodicei. — Harv. in HooTc. Br. Fl. vol. ii. p. 105 ; Harv. P. B. 

 plate 129 ; Harv. Man. p. 174 ; Harv. Syn. p. 146 ; Atlas, plate 56, 

 fig. 257; /. G. Ac/ardh, SjJ. Gen. Alg. vol. ii. p. 57; Wyatt, Ahj. 

 Damn. No. 184. 



Hab. — Parasitical on Algffi, near low-water mark. Annual. Summer. Rare. Forres 

 {Mr. Brodie) ; Northumberland coast {Mr. Robertson) ; Torquay {Mrs. Griffiths and 

 Miss Cutler) ; Cornwall {Mr. Ralfs) ; Saltcoats {Rev. D. Landshorowjh). 



Geogr. Dist. — British Islands ? 



Description. — Root, a minute spreading disc. Fronds tufted, from 

 one to two or sometimes three inches long ; main stem rather stout 

 at the base, tapering upwards, and generally percurrent ; in the older 

 part opaque, with veins, often shaggy, with minute fibres ; in the younger, 

 more or less distinctly articulated and transparent, everywhere closely 

 set, almost from the base, with erecto-patent branches, rather stout at 

 their insertion, and tapering upwards, the lowest divisions always longest, 

 giving the frond and its parts a pyi'amidal outline ; these branches are 

 ao-aiu furnished with a similar set of branches, and these often with a 

 third set, the \iltimate branchlets being often pectinated in their upj)er 

 half with a few short, secund, tooth-like processes ; all the divisions are 

 rather patent, sometimes slightly recm-vcd. Articulations of the main 

 branches about twice as long as broad, those of the ramuli a little 

 VOL. II. y 



