346 46. Scytosip. 2.THALASSIOPHYT7E. PI. cell, apk, 
Ulva compressa, Lin. S. P. 1632 ; Engl. Hot. 1739. 
Ulva marina tenuissima et compressa, Raii Syn. 63,5. 
Tretnella marina tenuissima et compressa, Dillen Muse. 48. 
Conferva compressa, Roth Cat. 1, 163. 
Conferva erinita, Ruth Cat. 2, 191. 
Scytosiphon coinpressus, Lyngbye Hydr.Dan. 64. 
Sea-shore. 
T ha llus 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 ramulosa, Engl. But. 2137. 
Sea-shore. 
Thalli numerous, aggregated, 2 inches high; branches 
awlshaped. 
4. Scytosiphon Temple torn. Temple tori s leathernpipe . 
Thallus pale green, tubular, hairlike, repeatedly branch- 
ed ; branches and twigs alternate, pressed to the stem, at- 
tenuated, acute. 
Conferva paradoxa, Dillw. Syn. 70; 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. Scytosiphon 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, Agardli Syn. 46. 
Sea-shores. 
c. Thallus olive, leatherlike ; sporidia scattered, solitary. 
6. Scytosiphon J oeniculaceus. Fennel leathernpipe. 
Thallus olivaceous, leatherlike, round, threadlike, much 
branched ; branches and twigs vague, bent, very closely 
entangled, attenuated, hairlike. 
