346 46. Scytosip. 2. THALASSIOPHYT. Pl. cell. aph. 
Ulva compressa, Lin. S. P. 1632; Engl. Bot. 1739. 
Ulva marina tenuissima et compressa, Rati Syn. 63, 5. 
Tremella marina tenuissima et compressa, Dillen Musc. 48. 
Conferva compressa, Roth Cat. 1, 163. 
Conferva crinita, Roth Cat. 2,191. 
Scytosiphon compressus, Lungbye Hydr. Dan. 64. 
Sea-shore. 
Thallus polymorphous, narrower at bottom, simple or 
branched ; branches narrower at bottom, mostly simple. 
b. Clathrata. Thallus green, branched, veined in squares 
like casement-windows ; sporidia in each cell. 
3. Scytosiphon ramulosus. Small-branched leathernpipe. 
Thallus green, membranaceous, tubular, much branched, 
rather compressed; branches thickest above; twigs scattered, 
very numerous, pointed. 
Ulva ramuiosa, Engl. Bot. 2137. 
Sea-shore. p 
Thalli numerous, aggregated, 2 inches high; branches 
awlshaped. 
4. Scytosiphon Templetoni. Templeton’s leathernpipe. 
Thallus pale green, tubular, hairlike, repeatedly branch- 
ed; tranches and twigs alternate, pressed to the stem, at- 
tenuated, acute. 
Conferva paradoxa, Dillw. Syn. 10; Engl. Bot. 2328. 
Sea-shore. 
Thallus closely tufted, 4 or 5 inches long, slippery.—It 
appears to differ from S. erecta of Lyngbye Hydr. Dan. 15. 
5. Scytlosiphon clathratus. Window leathernpipe. 
Thallus pale green, round, hairlike, tubular, repeatedly 
branched; branches and twigs alternate, spreading, diverg- 
ing, lying down, pointed. 
Conferva clathrata, Roth Cat. 175. 
Ulva clathrata, Zgardh Syn. 46. 
Sea-shores. 
c. Thallus olive, leatherlike ; sporidia scattered, solitary. 
6. Scytosiphon foeniculaceus. Fennel leathernpipe. 
Thallus olivaceous, leatherlike, round, threadlike, much 
branched ; branches and twigs vague, bent, very closely 
entangled, attenuated, hairlike. 
