21 
No. 50. R. thuyoides. Har. Stem erect, rising from creeping fibres. 
Summer and autumn in all parts of the Bay, rather abundant, dull brown stem, twice as thick as hog’s 
bristles; fruit very large, pear or apple shape, discharging the spores in large round masses or swarms that 
soon separate ; antheridia frequently in motion. 
Genus, POLYSIPHON IA. Grey. 
Filamentous, generally articulate, joints longitudinally striate, siphons ; fructifi¬ 
cation, pear-shape spores, and tetraspores imbedded. 
No. 53. P. stricta. Dillw. Filaments densely tufted, setaceous, flaccid, bi- 
striated, dichotomous, branches and ramuli straight, erect; axils acute ; upper arti¬ 
culations four or five times longer than broad ; capsules ovate, sessile. 
Summer, floating at Yellow Hook and Fort Hamilton, color very dark red, approaching a brown, joints 
very irregular, from 1 or 2 times longer than broad in ramuli, and near root, to 8 or 10 times the diameter 
in principal branches ; it seems nearly allied to P. urceolata, but a very much darker color. 
No. 54. P. Olneyi . Harv. Filiform, dichotomously and much branched, brown, 
joints of stem shorter than broad, of branches longer, main stem thicker than hog’s 
bristles, ramuli capillary ; fruit large, pear shape, on short stem at dissepiments; pe¬ 
ricarp open at top, containing large globular sori, or swarms. 
Summer, at Castle Garden, at low water mark. I have not seen an official specimen, or a description 
of the plant, but learn from a friend that it has been described. 
No. 55, P. formosa. Suhr. Threads exceedingly slender and flaccid, branches 
long, flexuous, bearing a second and third series ; joints of main branches, many 
times longer than broad ; fruit pitcher shape, with a produced contracted mouth. 
Annual in May, at Hurlgate, Fort Hamilton, and Staten Island, at low water mark, on rocks; red, ad¬ 
heres well to paper. 
No. 58. P. urceolata . Sm. Rigid, setaceous, much branded, loosely entan¬ 
gled, dichotomous, joints of ramuli short, of stem three to five times the diameter ; 
fruit stalked, pitcher shape, with a produced contracted mouth. 
Found on the shore at Staten Island and Fort Hamilton, summer, probably drifted from the sea; does 
not adhere well to paper; bright red. 
No. 57. P. elongella. Har. Stem setaceous, sub-dichotomous, much spread, 
ramuli elongated and flaccid ; joints of branches as long as broad, marked with three 
parallel veins, dissepiments pellucid. 
At Owls Head and Yellow Hook in the summer, rare ; 1 to 3 inches long. 
No. 58. P. variegata . Ag. Filaments brownish purple, rigid below, attenu¬ 
ated upwards to a capillary fineness, dichotomous, articulations in the principal 
branches twice as long as broad, in the ramuli short, marked with three broad pa¬ 
rallel oblong tubes ; siphons 6 or 7 ; fruit ovate on short stalks. 
Abundant on most rocks in the harbor, summer. 
No. 59. P. nigrescens. Hud. Robust, rigid, bushy above, lower articulations 
short, upper longer than broad, siphons about 20 ; fruit ovate sessile. 
