Grateloupia denticulata Mont.

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Grateloupia denticulata Mont.’(Voy. Bonite, Bot. Crypt. 65.pl.
I45• /• -T. 1846) is apparently known only from the original
material collected at Paita, Peru, in July 1836, by Gaudichaud.
Three authentic specimens of this, one of them under an un-
published manuscript specific name, another the specimen
figured by Montagne, are preserved in the Muséum d’Histoire
Naturelle of Paris. The largest of these, as it lies on the paper,
has an extreme length of about 16 cm. and its widely spreading
branches have a span of about 25 cm. The thallus is thick
(0.65-0.75 mm.) and coriaceous or cartilaginous; the cuneate

171

base, which is about 2 cm. long, dissolves subpalmately-dicho-
tomously into three segments, one of which soon divides again,
so that there are four main linear-lanceolate lobes, which are
8-16 mm. broad and 8-12 cm. long; two of the main segments
are again subdichotomous near the apex; near the base and
apex are a few lanceolate, simple or furcate marginal lobes or
proliferations 1-2.5 cm. long; except at extreme base, the mar-
gins are beset with small aculeate teeth and the surfaces are
scabrous with minute aculeae, verrucae, and papillae. In a
section the medulla is filamentous, rather compact, and 0.3-
0.5 mm. broad; the cortex proper consists of nearly parallel
anticlinal filaments 6-10 cells long, these cells mostly oval-
ellipsoid and twice as high as broad; the subcortex consists
of several series of cells whose protoplasts are mostly 11-16
in maximum diameter; the peripheral or surface cells are oval
or clavate, their protoplasts 3-8 /u high and 1.5-3 times as
high as broad; surface jelly 4-8 n thick. The cystocarps are
minute (115-300 ¿1 in diam.), deeply immersed, and have a
small basal placenta. No form of fructification was observed
by Montagne. J. Agardh (Sp. Alg. 2: 242), knowing the plant
only from Montagne’s figure and description, referred it, with
a question mark, to Rissoella and he has been followed in this
by De-Toni, but the cystocarps are very different from those of
Rissoella and its allies. It seems to us that the species is
most at home in Gratelottpia, where originally placed, though
possibly a thorough examination of the development of the
cystocarp might indicate other affinities. From the typical
Sebdenias the species differs in the thicker thallus and the
softer more distinctly filamentous cortex.

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