104 GIGARTINACEAE 
PLATE 39, FIGURE A; PLATE 40, FIGURES 1—3); on barnacles, in 
company with Gelidium crispum, Pescadores Islands, region of 
Ancón, Feb. 12, 1907, Coker 80 p.p. [PLATE 39, FIGURE В; plate 40, 
FIGURES 4—11.] 
The two collections cited differ considerably in habit, as will 
be noted from our published photographs. In 80 the plant is 
very sparingly cystocarpic and the branch system has a much 
greater development than in 55, which is crowded with cystocarps 
and has contracted or aborted branches. Branches that are 2-5 
times dichotomous in 80 are often represented in 55 by simple 
mammiform or ovoid excrescences. Yet, among the plants under 
no. 55, in which the material is more ample than in the other, are 
some in which the branch system appears to be of an intermediate 
character. 
The form of Gigartina glomerata collected by Dr. Coker under 
no. 80 bears a certain supeiácial resemblance to small densely 
branched conditions of the Californian G. canaliculata Harv., but 
is distinguished at once by the irregular branching: the unarmed 
conceptacles, etc. 
The abundance of the cystocarps in no. 55 has дена (һе роз- 
sibility of relationship with the New Zealand Chondrus tuberculosus 
Hook. f. & Harv. [Gigartina tuberculosa (Hook. f. & Harv.) Grun.], 
which has been reported also from the Straits of Magellan, and 
to which Dr. Coker's 565 p.p. from Mollendo appears to belong, 
but this no. 55 differs in being more rigid, in its less sustained 
dichotomy, narrower, less flattened and less canaliculate segments, 
narrower more acute apices, in bearing cystocarps on small 
ramuli instead of upon the main segments, etc. 
The somewhat palmate or pedate mode of ultimate branching 
sometimes exhibited by sparingly cystocarpic plants of no. 80 Р.Р: 
has suggested also the possibility of affinity with the evidently 
more slender Gigartina bactracopus, described by Bory from 
Concepcion, Chile, but an examination of Bory’s original material, 
which we have been permitted to make through the courtesy of 
M. Hariot, shows that plant to have the structure of an Ahnfeltia 
or Gymnogongrus, as already recognized by Hariot.* 
Dr. Coker's plants are in some respects suggestive of Bory's 
* Miss. Sci. Cap Horn 5: 70. 1889. 
