182 CALLITHAMNION. 



tetraspores solitary, axillary. Harv. in Hook. Br. Fl. ii. p. 

 346 ; Wyatt, Alg. Danm. No. 22 ; Harv. Phyc. Brit. t. 

 cclxxii. Conf. corymbosa, E. Bot. t. 2352, (joints too 

 short). 



On Algae, near low-water mark, and on rocks, not uncommon. 1 3 

 inches high, frond with a more or less evident principal stem, which is ca- 

 pillary below, byssoid above, and closely set with long, alternate branches, 

 which are more or less divided ; the penultimate ones having alternate, 

 dichotomous, multifid branchlets of an obovate outline, rounded at top, or 

 somewhat level-topped. The branching of these ramuli is subject to much 

 variation, sometimes being nearly regularly dichotomous, at other times 

 having an alternate character, but the plant is well marked to the naked 

 eye by the peculiar, level-topped or corymbose appearance of the smaller 

 branches, joined to their slender, byssoid aspect. Tetraspores minute, 

 seated on the forked ramuli immediately below the furcation, thus seem- 

 ingly axillary. Favellce binate, in the axils of the branches. Colour a 

 rose, or purplish red. Substance exceedingly flaccid and gelatinous, ad- 

 hering most closely to paper, and having a fine gloss when dried. 



25. C. spongiosum, Harv. ; stems robust, cartilaginous, 

 more or less opake and veiny, branched in every direction ; 

 branches thickly set with dense, quadrifarious, repeatedly di- 

 chotomous, round-topped branchlets; axils patent; apices 

 short, bifid ; articulations of the branches swollen at the 

 joints, thrice as long as broad. Harv. in Hook. Br. Fl. ii. 

 p. 346 ; Wyatt, Alg. Danm. No. 93 ; Harv. Phyc. Brit. t. 

 cxxv. 



On rocks in the sea, generally such as are perpendicular, and on other 

 Algas. Dunleary, 1802, Mr. Templeton. South of England and coasts of 

 Ireland and Scotland. Fronds 2 4 inches high, flaccid, soft, holding 

 water like a sponge; stems shrubby ; branches long, spreading in every di- 

 rection, thickly clothed with short, secondary branchlets, about half an 

 inch in length, which are again covered with a third set, which are dicho- 

 tomously divided, and, spreading on all sides, give the plant a rounded, 

 bushy character. Main articulations veined. Tetraspores solitary, axil- 

 lary. Favellce roundish or lobed. To the naked eye this plant has some- 

 thing the habit of C. Arbuscula, while, in its microscopic characters, it 

 comes nearer C. corymbosum. It is, however, a much coarser plant than 

 the latter, void of gloss when dry, and of a duller colour. The joints are 

 uniformly shorter, the ramuli more regularly dichotomous, dense and qua- 

 drifarious, and the axils more patent. It was originally discovered by 

 Mr. Templeton, in the station in which I afterwards gathered it 30 years 

 later, a fact of which I was ignorant when I first described it in ' British 

 Flora.' 



26. C. pedicellatum, Dillw. ; stems setaceous, loosely and 

 irregularly branched ; branches naked, or set with short, al- 

 ternate, somewhat tufted, sparingly dichotomous branchlets; 

 apices obtuse ; articulations variable, mostly very long ; te- 

 traspores solitary, elliptical or pear-shaped, axillary, stalked. 



