332 34. Cladost. 2.THALASSIOPHYTiE. Pl.cell.aph . 
Sea- shore. 
Theccc on the shorter twigs of the branches. 
3. Cladostephus niveus. White bottlebrush-weed. 
Thallus branched; branches slender, rather stiff, white; 
twigs in obscure whirls; joints as long as broad, dark. 
Conferva nivea, Dillwyn Syn. 54 ; Engl. Bot. 2529 ; Agardh Disp. 30. 
Byssus lanuginosus, Willan Sulph. Wat. 10. 
Roots and dead leaves in sulphureous springs. 
Thaili very slender; branches very numerous, ringed 
with black, mostly covered with a white crust. Perhaps a 
thorea; but it is very imperfectly described by authors. 
X. 35. SPHACELARIA. Lyngbye. Rust-weed. 
Thallus olive-branched, jointed ; branches 2-rowed ; 
joints all compound; sporidia, enclosed in the tip of the 
branches which become sphacellated and open, rarely in 
lateral, ovate, capsular thecse. 
1 . Sphacelaria pennata. Pinnate rust-weed. 
Thallus much branched, slender ; branches alternate, 
rather bipinnate, lobes 2-rowed, alternate and opposite ; 
joints as long as broad. 
Conferva cirrhosa, Roth Cat. 3, 294. 
Conferva pennata, Iluds. FI. Angl. 604; Dillw. Conf. S6 ; Engl. Bot. 
2330. 
Ceramium cirrhosum, Agardh Disp. 21. 
Sphacelaria pennata, Lyngbye Hydr. Dan. 195. 
Sea-shore, on rocks, corallines, and sea-plants. 
Tufts bushy, from one-half to two inches high; threads 
olive- brown. 
2. Sphacelaria scoparia. Shore rust-weed. 
Thallus much branched, stiff; branches in bundles, al- 
ternate, nearly bipinnate, crowded; lobes short, alternate, 
2-rowed, pressed close, pointed; joints as long as broad. 
Muscus marinus rubens, Ger. emac. 1571 ; Park. 1296. 
Conferva marina pinnata, Dillen in Raii Syn. 59, 14. 
Conferva scoparia, Lin. S. P . 1655; Engl. Bot. 1552; Dillw. Conf. 52. 
Ceramium scoparium, Roth Cat. 2, 141. 
Sphacelaria scoparia, Lyngbye Hydr. Dan. 104,3. 
Sea-shores, on shells and pebbles; all the year. 
Thallus dull, olive-brown, 3 to 6 inches high ; stems 
many, clothed with entangled jointed threads or twigs 
clustered. 
