: 
Pi. cell.aphyl. 1. HYDROPHYTE. 9. Bryopsis. 2892 
Bryopsis arbuscula. Shrublike moss-weed. ~. 
Thallus rather compressed, bright green, branched ; 
branches naked at bottom, pinnate at top; lobes numerous, _ ., 
long, parallel, linear, opposite. : 
Ulva plumosa, Hudson Fl. dagl. 5171; Engl. Bot. 2375. 
Bryopsis arbuscula, Lamour. Journ. Bot. 1809, 134. 
Fucus arbusculus, De Cand. Fl. Fr. 2, 35, 
On stones and rocks on the coast. 
Thallus 2 inches long; sportdia clustering towards ther 
circumference leaving the centre pellucid. 
ai 
ia 
X. 10. VAUCHERIA. De Candolle. Vaucher. .. 
Thallus threadlike, tubular, mostly branched above, not, = 
jointed, rather stiff, mostly cut, angled; membrane of the - 
threads hyaline; sporidia green, minute, globose, scattered “i 
in the tube; side-branches vesicular, single or aggregate, .., 
elongating into new individuals, or barren incurved. 
a. Vesicles single. 
1. Vaucheria dichotoma. Twoforked vaucher.- 
Presh-water ; threads large, tufted, upright, forked at - 
top; branches long; vesicles globose, scattered, sessile. 
Conferva dichotoma, Lin. Sp. Pl. $635; Dillw.15; Engl. Bot. 932. 
Ceramium dichotomum, Roth Cat. 3, 119. 
Ceramium czspitosum maximum, Roth Cat. 3, 120. 
Vaucheria diehotoma, Agardh Syn, 47. 
Stagnant waters and ditches; April to August. 
Tufts angular, cut, blackish; ¢hreads angular at bottom,.... 
slippery, a foot long. 
Bf! 
2. Vaucheria ovata. ‘ Qvate vaucher. 
Fresh-water ; threads hairlike, rather forked, tessular, 
eduncled, single, globose; peduncles naked, curved. 
p gle, & 
Ectosperma ovata, Vaucher, 25. 
Vaucheria ovata, De Candolle Fl. Fr. 2, 63. 
Conferva bursata, Muller Nov. Act. Petr. 3,96. 
Vaucheria bursata, Agardh Disp. ed. 1,21. 
Ditches and stagnant waters; April. 
Tufts very dense, floating on water; threads 9 inches -z 
long, simple at bottom, twice as long as the vesicles. 
3. Viucheria hamata. Hooked vaucher, 
Presh-water ; threads hairlike; branches vague; vesicles = 
peduncled, solitary, globose; peduncles with a barren hook, 5. 
turned back, 
VOL. I. gu 
