62 LAMINARIACEAE 
long, 6-9 mm. wide, narrower than the vesicles ог equaling them 
in maximum width and 0.35-0.5 mm. thick; the vesicles are 
cylindric-ellipsoid, 3.5-4.5 cm. X 1.1-1.4 cm., 2-5 times as long as 
their maximum width; muciferous canals are abundant in the 
blades but rare or inconspicuous in the stipe; cells of the inner 
cortex of blades 25-55 и in diameter in cross section, rather thick- - ` 
walled; the two lowest blades are compound, if they may be 
properly so described, and are fertile, the higher with a short 
vesicle in the common stalk and the lower without a vesicle (com- 
parison with ocher specimens collected by Dr. Coker indicates 
th.t these two compound fertile blades were close to the holdfast 
and were probably the two lowest blades of the plant); each of 
these compound blades consists of four lanceolate or linear- | 
lanceolate obscurely denticulate fertile bladelecs, each with a short — 
median cleft at its base; the sori are continuous and occupy the a 
greater part of the basal half of the bladelets or are occasionally E 
limited to a transverse band near the middle of the bladelet. | 
Dr. Coker's numbers 09600 and 09614 have admirably pre- 
served holdfasts that were evidently chopped out with a hatchet 
or strong knife from where the plants were growing “оп surf- 
washed rocks."* In 09614, a mass of closely interwoven rhizomes 
and hapteres measuring 12 X 8 X 4 cm. (PLATE I9) was cut out, 
but the individual rhizomes are shown better by his no. 09600, 
in which the interwoven mass is less dense and thick. А blocked- 
out portion of the latter is shown in our PLATE 20. 
In numbers 09600 and 09614, the fertile and apparently full- 
grown plants attain a length of 2-3 m.; the vegetative blades are 
smooth, linear (or some of the lower linear-lanceolate), mostly 
15-25 cm. long, 5-24 mm. wide, a little narrower or broader than 
the vesicles or equaling them, 0.3-0.4 mm. thick, the margins 
of the lower blades with numerous short (г mm. or less), mostly 
blunt, truncate or capitate, brownish and indurated teeth, those 
В Е ла аа а j] 
* Under 09614, Dr. Coker has the following note: “А very abundant weed at- 
The islets and rocks have a fringe of 
growing Dr. Coker writes, 
fasts were exposed by the receding waves but I do not remember to have seen them 
de.” 
