29 
spores immersed in the articulations ; fruit mostly on the lateral branchlets, subtend¬ 
ed by 3 or 4 involucre ramuli. 
Summer and autumn; very abundant in all parts of rhe Bay; very variable in size, form and color; 1 
to 20 inches long, and from brown to dull red; on rocks, stones, sticks, Zostera, Fucus, and other Algse, 
from half tide level to very deep water. 
No. 146. C .diaphanum. Ag. Setaceous, attenuated upwards, rather flaccid, 
irregularly dichotomous, the lower forkings distant, the upper close, branches set 
with short lateral dichotomous ramuli, articulations pellucid, those of main stem 
3 or 4 times the diameter, those of the ramuli short, dissepiments swollen, opaque ; 
apices hooked inwards, fruit near the tips of the branches. 
Summer and autumn, on rocks, Fucus, and other Algae; abundant; 2 to 8 inches high. The colored 
dissepiments, with pellucid joints, give the appearance of beads strung on white glass. We have several 
kindred species, nearly related. Mr. Agardh has placed these in a genus distinct from ceramium, and has 
described a large number of species; the new genus is probably an improvement, but there is some danger 
of extending the number of species, as the plant is very varied in habit; and if we are to specify all the varia¬ 
tions, then the number of species in our harbor alone, would amount to several hundred. For the present, 
I shall place the whole under this specific head, with the following varieties : 
No. 148. G diaphanum , var. ohtusa. Setaceous, fastigiate, dissepiments 
opaque, joints pellucid, axils at very obtuse angles, filiform, dichotomous. 
On Zostera and on Algae, from half tide to low-water mark; very abundant in autumn, in all parts of 
the Bay; 1 to 6 inches long. 
No. 149. C. diaphanum , var. obscura. Setaceous, filiform, dichotomous, 
joints pellucid, except near the root, where they are entirely coated, dissepiments 
opaque. 
On Fucus nodosus, and other Algae, at Hurlgate, between tide marks; abundant in summer and au¬ 
tumn; half an inch to 2 inches long. 
No. 159. C. diaphanum , var. rectangular is. Axils all at right angles, joints at 
apices very short, midway between extremities 1 to 1J times longer than broad. 
Autumn, on rocks and Algae at low water mark, all parts of the harbor, J inch to 1 inch high, abun¬ 
dant, though difficult to find on account of its diminutive size. I seldom know that I have it in the morning’s 
work, until preparing the plants with a lens in the evening; the plant is much obscured by very minute pa¬ 
rasites. 
Genus, SPYRIDIA. Har. 
Filiform, cylindrical, much branched, traversed by a wide articulated tube, whose 
walls are composed of small angular cells, ramuli setiform, simple jointed; fruit 
stalked, gelatinous, involucred by short ramuli. 
No. 169. S. Americana. Filiform, stout at base, and diminishing gradually to 
the apices, which are obtuse ; sub-distichous and somewhat divaricate, sub-opaque 
cartilaginous, dull brown to pinky red, 2 to 8 inches long, anastomose in a slight de¬ 
gree, all the branches and ramuli pectinated with fine hair-like ramellus a tenth of 
an inch long; fruit round, stalked on the ramuli, and also imbedded in the branches. 
July to September, on Zostera and rocks, at and below low-water mark; found floating in most parts 
