Ser. i Fam. Ceramiea. 
Prats CLXIV. 
CALLITHAMNION CRUCIATUM, 4. 
Gen. Cuar. Frond rosy, or brownish-red, filamentous; stem either opake 
and cellular, or translucent and jointed; branches jointed, one-tubed, 
mostly pinnate, (rarely dichotomous or irregular) ; dissepiments hyaline. 
Fruit of two kinds on distinct plants; 1, external ¢e¢traspores, scat- 
tered along the ultimate branchlets, or borne on little pedicels ; 2, 
roundish or lobed, berry-like receptacles (/favel/@) seated on the main 
branches, and containing numerous, angular spores. CaALLITHAMNION 
(Lyngb.) »—trom KaAos, beautiful, and Oapnov, a little shrub. 
CALLITHAMNION cruciatum ; filaments densely tufted, irregularly and rather 
sparingly branched; branches alternately divided, joimted, furnished 
at each joint with two to four opposite or quaternate, slender, short 
pectinato-pinnate ramuli; tetraspores elliptical, subsessile, borne on 
the lowermost joints of the ramuli. 
CALLITHAMNION cruciatum, 4g. Syst. Alg. vol. ii. p.160.. Harv. in Hook. 
Br, Hl. vol. i. p. 339. Wyatt, Alg. Danm. no. 182. Harv. Man. p. 104. 
J. Ag. Alg. Medit. p. 70. Endl. 3rd Suppl. p. 34. Hook. fil. et Harv. in 
Lond. Journ. vol. vi. p. 412. 
B pumilum; vouch smaller, the ramuli more dense, and the joints shorter. 
CALLITHAMNION cruciatum, 8 pumilum, Harv. Man. p. 104. 
CALLITHAMNION pumilum, Harv. in Hook. Br. Fl. vol. ii. p. 339. Endl. 3rd 
Suppl. p. 34. Harv. in Mack. Fl. Lib. part 3. p. 213. 
Has. On mud-covered rocks, near low water mark. Annual. Summer. 
Rather rare. Pier, Torquay, Mrs. Griffiths. Salcombe, Mrs. Wyatt. 
Milford Haven, Wr. Ralfs. Plymouth, Rev. W. 8. Hore. Cork 
Harbour, Dr. J. R. Harvey. Coast of Down, Mr. W. Thompson. 
Ferriter’s Cove, Kerry, Mr. W. Andrews. 8, Miltown Malbay, W.H./. 
Goer. Distr. Atlantic shores of France and Spain. Mediterranean and 
Adriatic Seas. ‘Tasmania, MW. Gunn. 
Drsor. Filaments one to two inches long, capillary, flaccid, densely tufted, 
sparingly branched in an irregular manner. Branches mostly alternately 
divided, the lesser divisions furnished with short lateral branchlets, jointed; 
each joint throughout the whole length of the plant. furnished with slender 
opposite or quaternate and cruciate ramuli. Aamulz not more than half the 
diameter of the branches, from half a line to nearly a line long, erecto-patent, 
straight, pectinato-pimnate ; the pinnul opposite, very slender, cylindrical, 
not greatly tapering to the point. _Apices of the branches darkened, owing 
to the crowding of the terminal ramuli. drticulations of the stem and 
branches from two to four times as long as broad; of the ramuli twice or 
thrice; and of the pinnule about twice as long as broad :. the dissepiments 
somewhat contracted. Tetraspores formed by the metamorphosis of the 
lowermost pinnulee, sessile or subpedicellate, elliptical, cruciately divided, 
with a rather narrow limbus. Fuavelle I have not seen. Colour a brownish- 
red. Substance flaccid. ‘The plant adheres closely to paper, and is apt to 
decompose if wetted after once it has been dried. 
Et 
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