178 CALLITHAMNION. 



or spherical, ou the inner faces of the ramuli, 2 or 3 together or solitary. 

 FavellcE two or more toe^ether on the branches. Colour in young specimens 

 a fine purple-red, in old brownish, becoming brighter in fresh water. 



15. C. hyssoideum, Arnott; stems extremely slender, flac- 

 cid and byssoid, much divided ; branches linear-lanceolate, 

 set with long, slender, flexuous, snb-simply pinnate plumules ; 

 joints of the branches eight times, of the ramuli four times 

 longer than broad ; tetraspores solitary, sessile on the pinnse. 

 Harv. in Hook. Br. FL ii. p. 342; Wyatt, Alg. Damn. No. 

 185 ; Harv. Phyc. Brit. t. cclxii. 



Near low-water marlc, on other Algae. 'WTiitsand Bay, Dr. Jacob. Not 

 very uncommon. — Stems extremely tender, flaccid and gelatinous, much 

 divided from the base, either with several principal branches thicker than 

 ihe rest, which bear a great number of lesser branches, or wholly composed 

 of slender, byssoid branches, inextricably entangled together, the main 

 stems in the coarser specimens full of veins ; branches having a linear-lan- 

 ceolate outline, tapering to a point, clothed with long, slender, sub-simply 

 pinnate ramuli, either quadrifarious or distichous, all the divisions alter- 

 nate. Joints of the stem many times longer than broad, of the ramuli 

 about four times longer than broad. Tetraspores elliptical, sub-solitary 

 near the base of the ramuli. Faiiella sessile on the stems, frequently three- 

 lobed. This species has the habit and substance of Cal. cori/)nbosiim, with 

 which, at one time, I was disposed to unite it. In ramification, however, 

 it more nearly agrees with C. roseum, but is much more slender and 

 delicate. 



16. C. polyspermum, Ag. ; tufts globose ; filaments slen- 

 der, delicate, loosely branched, somewhat naked below, disti- 

 chously plumulate above ; plumules linear-oblong (in out- 

 line); pinnae short, simple, patent, acute, spine-like ; articu- 

 lations of the branches 4 or 5 times, of the ramuli twice as 

 long as broad ; tetraspores lining the inner faces of the pin- 

 nae. Harv. in Hook. Br. Fl. ii. p. 342 ; Wyatt, Alg. Damn. 

 No. 140 ; Harv. Phyc. Brit. t. ccxxxi. 



On rocks and the larger Fuci, not uncommon. Annual. Spring and 

 summer. — Tufts globose, 1 — 3 inches in diameter, dense; stems sub- 

 simple below, much branched above in a fan-like manner ; the branches 

 several times divided and set with lesser branches, all the larger ones hav- 

 ing spine-like, alternate, subulate, short ramuli, the larger pinnated with a 

 second series, the uppermost ones occasionally still more compound ; all 

 the ramuli spreading, sometimes reflexed. Joints of the stem and branches 

 torulose, with a narrow tube. Capsules ])rofuse, spherical. Favellce large, 

 roundish or ovate, binate. Colour a dull rose-red or purplish. In drying- 

 it adheres less perfectly than some others to paper. 



17. C. pm'pwascens, Sm.; "purplish-red, repeatedly 

 branched, very slender and tufted, joints slightly turned, 

 thrice as long as broad, with pellucid partitions, those of the 



