326 29, Callith. 2. THALASSIOPHYTZ. Pl. cell. aph. 
- 13. Callithamnion Rothii. Roth’s pretty-weed. 
.Thallus forked, branched, tufted, upright, short; tuft 
close, scarlet; branches and twigs alternate; joits about 
3 times as long as broad. 
Conferva pheenicia, R. Brown MSS. With Bot. 4, 165. 
Conferva Rothii, Zurton’s Syst. Nat. 6,1806; Dillo, Conf, 733; Engl. 
Bot. 1702. 
Conferva violtcea, Roth Cat. 1, 190. 
Callithamnion Rothii, Lyxgbye Hydr. Dan. 129. 
Sea-shore. 
Tufts oblong, bright red, when dry crimson or purplish ; 
thallus about half an inch high; branches below distant, 
above crowded. 
14. Callithamnion lanuginosum. Woolly pretty-weed. 
Thallus short, slender, mostly branched, light reddish ; 
branches simple, upright, scattered, going out horizontally. 
Conferva lanuginosa, Dillw. Conf. . i 
Callithamnion lanuginosum, Lyngbye Hydr. Dan, 131. 
On marine plants. 
Threads very minute, coming out horizontally from the 
base, simple or branched above. 
15. Callith. floridulum. Smallflowered pretty-weed. 
Thallus short, slender, tufted, entangled, mostly branch- 
ed, very light rose-red ; branches scattered, mostly simple, 
remote, placed towards the apex; joints about 3 times as 
long as broad. 
Conferva floridula, Dillw. Syn. 73. 
Rocks on the sea-shore. 
Threads very fine, about half an inch long; becomes dull 
reddish green when dry. 
16. Callith. interruptum. Interrupied pretty-weed. 
Thallus branched, short, purplish; branches and twigs 
alternate; joints dilated above, truncated, about four times 
as long as broad; thece lateral, elliptical, with a transverse 
separation, on short pedicells. 
* Conferya interrupta, Engl. Bot. 1838. 
On marine plants. 
Thallus dull rose-red, about an inch high. 
17. Callith. pedicellatum. Pedicelled pretty-weed. 
Thallus much branched, forked, hairlike, red;  dwigs 
many-cut; joints slightly dilated above, 5 or 6 times as 
