Grateloupia doryphora (Mont.) M.Howe

Plate 62. Grateloupia schizophylla
Photograph of a specimen (Coker 194b?from liquid preservative) exhibiting an
essentially simple main axis and numerous marginal proliferations, reduced to about
one half the natural dimensions.
Plate 61. Grateloupia schizophylla
Photograph of a dried specimen (Coker 194b) which exhibits frequent dichotomies
near the base and few marginal proliferations, reduced to about two fifths of the
natural dimensions.
Grateloupia schizophylla Kiitz. Tab. Phyc. 17: 11.
pi. 36. 1867
On surf-washed rocks, Chincha Islands, June 18, 1907, Coker
194b (plates 61 and 62),, ?olive-green,? and July 13, 1908, Coker
493 PP- (c?)-
Grateloupia schizophylla, originally described as coming from
Chile, may possibly be found to intergrade with G. Cutleriae, but
Dr. Coker?s specimens have the appearance of being distinct.
G. schizophylla, in its typical condition, has a deeply dissected dr
dichotomously branched thallus, while typical G. Cutleriae has a
simple thallus. Two of Dr. Coker?s specimens make an approach
to the type of G. schizophylla as figured by Kiitzing, one of them
being, however, dissected into more numerous linear segments;
this more copiously forked plant, shown in our photograph (plate
61), is 1.2 m. long; just above its cuneate base are several close-set
and unequal dichotomies, after which the segments (8-25 mm.
wide) are simple or once or twice dichotomous, with subentire or
irregularly proliferous margins and occasional small linear or
linear-lanceolate proliferations from the general surface. But
under the same collection number (194b) and manifestly of the
same species occurs an individual of equal length (plate 62),
in which the main thallus is undivided until the apical region'Is
reached, and another individual that is once furcate a little below
the middle. In these simpler forms, however, the tendency to a
compound rather than a simple thallus manifests itself in the more
numerous and longer ligules, which are often 4-14 cm. long. These
simpler forms, though much larger in every way, are slightly sug-
gestive of certain Californian plants that have sometimes been
referred to Grateloupia prolongata J. Ag., but the Mexican type
specimens of G. prolongata are (in the dried state) only 10-16 cm.
long, with main axes 2-4 mm. broad, while the Peruvian plants
are about 1 m. long with main axes mostly 10-25 nun. broad.
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NEW YORK BOTANICAL GARDEN
02198899
02198899