Pi. cell. aph. 2. THALASSIOPHYT ZK. 29. Callith. 32g 
1. Callith. purpurascens. Purplish pretiy-weed. 
Threads thrice pinnately divided, very slender, membra- 
naceous, purplish red ; branches and twigs spreading; knots 
contracted; joits 3 times as long as broad. 
Conferva marina nodosa, condita montani instar ramosa, Diller 
Musc, 36. 
Conferva purpurascens, Huds. Fl. Angl. 600; Engl. Bot. 2465. 
Conferya rosea, Dillwyn Conf. 17. 
Ceramium roseum, Roth Cat. 2, 182. 
Callithamnion roseum, Lyngbye Hydr, Dan, 126. 
Sea-shore, on stones or marine plants. 
Thallus tufted, 2 or $ inches long; branches many, alter- 
nate; ; twigs very numerous; capsules on the upper side of 
the twigs. 
8. rosea. Tuft closer, rose red. 
’ Conferva rosea, Engl. Bot. 966. 
2. Callithamnion corymbosum. Corymibus pretty-weed. 
Thallus branched like network, corymbose, slender, 
tufted, rose-colour; branches alternate, many-cut, in bun- 
dles; apex 2-cut; joints slightly dilated above, about twice 
as long as broad ; knots pellucid; thece ovate, scattered, 
peduncled ; peduncles very short. 
Conferva corymbosa, Engl. Bot. 2352. 
Ceramium pedicellatum, Fl. Dan. 1596. 
Callithamnion corymbosum, Lyngbye Hydr. Dan. 125. 
»-Sea-shores. 
Thallus outline round. 
8. Callithamnion Borreri. Borrer’s pretty-weed. 
Thallus repeatedly branched, hairlike, bright red; 
branches all alternate, spreading in 2 directions, Zigzag, 
level-topped; joints cylindrical, about twice as long as 
broad. 
_Conferva Borreri, Engl. Bot. 1741, 
Sea-shore; October. 
Thallus tufted, about 2 inches high, becomes orange- 
yellow by weathering, very slender ; twigs corymbose ; knots 
Ei chily contracted. dal 
4. Callith. thujoides. Arbor-vite pretty-weed. 
Thallus repeatedly branched, very slender, tufted ; 
branches alternate, zizgag; side-shoots alternate, .com- 
pound; joints very short, cylindrical. ; 
Conferva thujoides, Engl. Bot, 2205. 
: ¥ 2 
