Pl.cell.aph. 1. HYDROPHYTE. lO.Vauch. 291 
Tufts very densely entangled, an ell long, floating; 
branches divaricating. 
O 
8. Vaucheria ornithocephala. Birds-head voucher * 
Fresh-water ; threads branched ; branches scattered ; 
vesicles ovate, obliquely beaked ; peduncles perpendicular. 
Conferva vesicata, Dillw. 74. 
Vaacheria ornithocephala, Agardh Syn. 49. 
Ditches; autumn. 
Tufts entangled, floating ; threads scattered, rather 
straight; vesicles 2 or 4 together, 1-sided, resembling a bird’s 
head ; peduncles very short. 
b. Vesicles in pairs , with a barren branch between them . 
9. Vaucheria sessilis . Sessile voucher . 
Fi esh-water ; threads hairlike, branched; vesicles sessile, 
mostly in pairs, ovate, intermediate barren branch turned 
back. 
Ectosperma sessilis, Vaucher, 31. 
Vaucheria sessilis, De Candolle FI. Fr. 2, 63 ; Engl. Bot. 1765. 
Stagnant waters and ditches; April. 
Tufts very dense, floating; vesicles sometimes solitary. 
10. Vaucheria geminata. Doubled vaucher » 
Fi esh-water ; threads hairlike, forked; vesicles in pairs, 
globose, opposite, on a common horned peduncle; horn in- 
termediate, straight. 
Ectosperma geminata, Vaucher , 29. 
Vaucheria geminata, De Candolle FI. Fr. 2, 62 ; Engl. Bot. 1766. 
Stagnant ditches; February. 
Tufts very close, floating;^ peduncles 3 times as long as 
broad, horizontal ending in a slightly jointed, barren, 
straight point. 
1 1 . Vaucheria ccespitosa. Turf vaucher . 
Fresh-water j threads hairlike, tufted, forked, branched; 
last branches horizontal, facing one way, vesicle-bearing ; 
vesicles in pairs, sessile, terminal, with a short, straight, 
intermediate point. 
Conferva canalicularis, Lin. S. P. 1634. 
Conferva fontinalis, Blumenbach in Goett. Mag. 1781, 80. 
Ectosperma caespitosa, Vaucher , 28. 
Vaucheria caespitosa, yjgardh Syn. 48. 
Springs, in clayey soils ; April. 
u 2 
