Pl.cell.aph. 1. HYDROPHYT7E. 21. Chaetoph. 301 
H. Confer voided. Thallus cylindrical, threadlike, 
tubular, jointed, simple or branched, uniform or biform ; 
joints pellucid; sporce granular, green, scattered in the 
joints; fruit external, but the granules often grow in the 
joints themselves. 
XXI. 21. CHAETOPH ORx\. Schrank. Chcetophore . 
Mass threadlike, branched ; threads springing from the 
axis, jointed, branched, growing slenderer, and ending in 
a long transparent hair extended beyond the surface of the 
mass; granules in the joints, sometimes growingwhile still 
in the mass.— Reddish. 
Chcetophora rubra. - Red cheeiophore. 
Mass cylindrical, threadlike, forked ; threads branched® 
jointed, red. 
Ulva rubra, Hudson FI. Angl. 571 ; Engl. Bot. 1627. 
Itivularia inultifida, PFeber and Mohr. Reise, 3, 193. 
Chaetophora rubra, Agardh Disp. ed. 1,42. 
Chorduria inultifida, Lyngbye IJydr. Dan. 51. 
Rocks on the sea-shore ; annual ; August and September. 
Mass crowded, 3 to 6 inches long, from a callous base; 
tip of the branches rather blunt. 
XXII. 22. LEATHESI A. Leathes . 
Mass globular, leatherlike, gelatinous, brownish ; threads 
branched, jointed, springing from a common basis; branches 
clubshape, blunt; spores scattered in the swollen joints.— 
Marine. 
Leathesia tuber if or mis. Tuberous leathes „ 
Mass globular, rather leatherlike, hollow; outer surface 
smooth, brown; threads very close, forked, branched; 
branches level at the top ; tips clubshaped. 
TremelSa difformis, Lin. Sp. PL 1G26. 
Itivularia tuheriformis, Engl. Bot. 1956. 
Nostoc maririum, Agardh Disp. ed. 1,45. 
Chaetophora marina, Lyngbye Hydr. Dan. 193. 
On marine plants; annual; summer. 
XXIII. 23. MYRIODACTYLON. DesVaux. 
Myriodaciyle, 
Mass elongated or globular, gelatinous, light green; 
threads branched, jointed, springing from a common basis; 
branches growing finer and ending in a long, hyaline fila» 
ment ; knots pellucid. 
