PL cell. aph. 2. TH ALASSIOPHYT^E. 46. Scytosip. 347 
Conferva fceniculacca, Hudson Fl.Angl. 594. 
Ceramium inflexum, Roth Cat. 3,131. 
Hippuris setaceus, Barretter Icon. 1123. 
Fucus subtilis, Turner Hist. 2,34. 
Scytosiphon fceniculaceus, FI. Dan. 1595, 1. 
Halymenia fceniculacea, Agardh Syn. 38. 
Hutchinsia inflexa, Agardh Syn. 58. 
Sea-shores; annual; spring. 
Thalli aggregate, 6 or 9 inches high, pale yellow or 
olive. 
7. Scytosiphon Jisiulosus. Fistular leat hornpipe. 
Thallus olive, leatherlike, round, threadshaped, simple* 
narrower at both ends. 
Ulva fistulosa, Hudson FI. Angl.bC)9$ Engl. Bot. 642. 
Conferva fistulosa, Roth Cat. 3, i 69. 
Chordaria Filum ,6, Agardh Syn. 14. 
Scytosiphon fistulosus, Agardh Disp. 24. 
Sea-shores attached to rocks. 
Thalli numerous, flexuous, gelatinous; sporidia four to- 
gether, disposed longitudinally. 
d. Thallus olive ; sporidia clustered. 
8. Scytosiphon filiformis. Threadlike lealhernpipcc 
'1 hallus reddish brown, gelatinous, soft, round or com- 
pressed; branches scattered, mostly simple, long. 
Conferva filiformis, -Ft. Dan. 1480. 
Ulva filiformis, Hudson Fl.Angl. 570. 
Ulva purpuraseens, Engl. Bot. 641, not of Hudson. 
Ulva compressa purpurea, Agardh Syn. 45. 
Sea-shores ; annual ; spring and summer. 
Thallus 6 inches high ; branches alternate, rarely slightly 
branched. 
9. Scytosiphon Turneri. Turner's leathernpipe . 
Thallus yellowish brown, membranaceous, finely reticu- 
lated, round, threadshape, simple, attenuated at bottom, 
very obtuse at top. 
Ulva Turneri, Dillvo. in Engl. Bot 2570. 
Gastridium Opuntia, Lyngbye Hydr. Dan. 71. 
Sea-shores on rocks and plants ; annual; summer. 
Thalli aggregate, 1 to 6 inches long, rarely globose ; 
sporidia in clusters. 
