36 CLADOPHORACEAE 
СНАЕТОМОКРНА Koütz. Phyc. Germ. 203. 1845 
A plonema Hass. Brit. Freshw. Alg. 213. 1845. 
Chaetomorpha cartilaginea sp. nov. 
Filaments erect, often twisted by wave action, rather rigid and 
cartilaginous-corneous throughout, attaining a height of 16 cm., 
affixed by branching rhizoids and more or less rhizomatous at 
base, mostly 250-400 in diameter, though only 150-170 іп 
lower part of basal cell, not constricted at septa; cells cylindric, 
usually 2-7 times longer than broad; the basal cell 2-4.5 mm. long, 
0-20 times as long as its average diameter; cell walls con- 
spicuously lamellate or delaminating internally except in youngest 
parts, becoming 25-110 thick. [PLATE 3, FIGURES 11-13; 
PLATE 5.) 
Growing on surf-washed rocks, Chincha Islands, June 18, 1907, 
Coker 196 p.p.—type. Also, what is probably a form of the same 
thing, but with short cells, mostly 24-114 times as long as broad, 
and without basal parts, in beach drift, La Punta, region of Callao, 
Jan. 25, 1907, Coker 38 p.p. Near San Lorenzo Island, not far 
from La Punta, old and battered specimens were dredged in 2% 
fathoms (Coker 59 p.p.) with cells of a character about intermediate 
between those of no. 38 and those of the type; these dredged 
specimens are without basal parts and in two cases cells were 
observed that were beginning to put forth diverticula somewhat 
after the fashion of Rhizoclonium, but it is probable that these 
were simply efforts of old detached filaments of a Chaetomorpha 
to regenerate or attach themselves. The remarkably thick 
laminated walls and the cylindrical unconstricted segments are 
common to all three collections. 
The type form of Chaetomorpha cartilaginea bears a slight 
resemblance to the more rigid conditions of Chaetomorpha aerea 
(Dillw.) Kütz., which is sometimes considered an attached form 
or variety of the earlier-published Chaetomorpha Linum (O. F. 
Müll.) Kütz.; but C. cartilaginea is attached by widely spreading 
and branching hapteres, while C. aerea has a discoid or scutate 
base; the basal cell of C. cartilaginea is 10-20 times as long as 
broad, while in C. aerea it is 2-10 times аз long as broad; the cells 
in the attached type specimen of C. cartilaginea average to be 
much longer than in C. aerea, though this is not the case in one 
