Callithamnion densun Suhr

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Antithamnion densum (Suhr) comb. nov.

Callithamnion densum Suhr, Flora 23: 281. 1840.

Callithanmion floccosum Mont. FI. Boliv. 11. 1839.

floccosum Ag. Sp. Alg. 2: 158. 1828.

Plant small, delicate, fragile, 1-2.5 cm- k>ng, rePer|t the
lower parts and there more or less involved in mucus; main axis
commonly denuded below, 95-140 ­j, broad, 3-8 times subdichot-
omous by the strong development of one of a pair of opposite

branches, these principal divisions distichcusly and oppositely
pinnate and the pinnae unilaterally pinnulate; pinnae often un-
equal, patent or erecto-patent, nearly straight or often slightly
incurved, acuminate, 0.5-0.7 mm. (7-13 cells) long, rather rigid
and (like the main axes) often broken off, frequently deciduous
at the small basal, potentially rhiziniferous cell, this xA-\i as
long as the next adjacent cell; pinnae bearing along their inner
faces a single (rarely, now and then, two collateral) secund series
of 1-6 ultimate ramuli (pinnules), the more proximal of these (in
tetrasporic plant) 2-5 cells long, subacute, slightly incurved, the
1-3 more distal ramuli sometimes 5-8 cells long and equaling the
continuation of the pinna; cells of main axes 160-330 n long,
mostly 1.5-3 times as long as broad, of nearly uniform diameter
or sometimes a little broader at the basal end, the cell wall mostly
18-40 n thick; median and proximal cells of pinnae 68-95 M X
28-48 n, mostly 1.5-2 times as long as broad, the cell wall about
5-10 m thick, apical cell of pinna subconical, 5-10 m in basal
diameter; tetrasporangia rather broadly ellipsoidal, about 80 ¨u
long, finally terminal on a usually i-celled pedicel, but commonly
originating as an introrse latero-terminal outgrowth from che
basal (less often the second) cell of a 2-5-celled pinnule, the distal
sterile cells at length deciduous. [Plate 30, figures 8-17.]

Dredged ?in 2^ fathoms,? Island of San Lorenzo, region of
Callao, in company with	Cladophora, etc., and more

or less overgrowing them, Coker 59 P-P-, Feb. 5, 1907.

The original specimen of Callithamnion densum Suhr, which
was attributed to Peru, we have been unable to locate and ex-
amine. Kiitzing included the species in his ?Species Algarum?
(650. 1849), but had not seen it. J. Agardh (Sp. Alg. 2: 66. 1851).
mentioned it under ?Species inquirendae.? De-Toni apparently
does not allude to it in his ? Sylloge Algarum.?