22 
Very abundant in summer, in all parts of the Bay, on rocks, stocks, shells, and stakes ,- from 3 to 12 
inches long. We have many varieties of this plant that probably should be numbered as distinct species. 
No. 59 A. P. nigrescens. Faded or bleached. 
No. 60. P. fastigiata. Both. Rigid, of equal diameter throughout, many 
times diehotomous, articulations shorter than broad, 16 to 18 siphons. 
On Fucus nodosus and F. vesiculosus at Hurlgate, dense tufts, dull brown, 1 to 2 inches long. 
Nos. 61, 62, are probably varieties of P. variegata, which they resemble; they 
were found floating on Zostera, in the sea, at the mouth of the harbor. 
No. 63, Is no doubt a variety of P. variegata ; found on rooks at Black Tom’s 
Reef, near Kavon Point. 
Genus, DA8YA. Ag. 
Filamentous, mostly opaque, irregularly cellular, composed of numerous parallel 
tubes surrounding a centre cavity, the ramuli jointed, single tubed ; fructification, ce- 
ramidia containing a tuft of pear shaped spores, and pods or stichidia containing te- 
traspores ranged in transverse bands. The name signifies hairy. 
No. 70. D. elegans. Har. Of very variable color and habit, red, from 2 inches 
to 3 feet long, distichous and dichotomous. 
From half tide to low water mark, in all parts of the Bay, on rocks, stones, and shells ; from Judy to 
November, very abundant. 
Family VIII LAUEBNCl ACR2E2. Har. 
Rose red or purple, polygonal cells, fructification ; external conceptacles, ovate 
with terminal pore, and containing a tuft of pear shape spores, also immersed tetra- 
spores. 
Genus, LAURENCIA. Lam our. 
Linear, pinnately branched, the apices obtuse, cellular, solid ; fructification, ce- 
ramidia containing a tuft of pear shape spores and tri-parted tetraspores imbedded 
in the ramuli; name in honor of Laurencie, a Naturalist of France. 
No. 73. L. dasyphylla. Woodw. Filiform, irregularly branched, ramuli 
short, club shape, obtuse, attenuated at base. 
Summer, common between tide marks, on most rocks in the harbor; 6 to 12 inches long. 
No. 74. L. i tenuissimn, Good and Woodw. Filiform, ramuli very slender, ta¬ 
pering to the base and apex. 
Very common on rocks and other Algae, summer, 3 to 8 inches. This plant in a moist state will destroy 
itself and other Algm with it in a few hours ; on a warm day in July, I gathered some of a beautiful red, on 
Black Tom, a well known rock in the Bay, and laid it on the warm seat of the boat; on turning to it in less 
than ten minutes, I was greatly astonished to see it turning green. I strongly suspect that the cause of rapid 
decay is bromine, held in a feeble organic state, and set free by a temperature a little above that of the water. 
No. 75. Found at Red Hook between tides, is probably a variety of L. tenuis - 
sima. 
