Hydroclathrus clathratus (C.Agardh) M.Howe

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^-y^droclathras clathratus (Bory) Howe
Fronds very irregular in form, in age much, lacerated, 5-16 cm.
diam., sessile, attached to the substratum by a broad base, sometimes
several bases confluent, differentiated into two layers of cells; the
apertures varying much in size and form and the frond involute along
their margins; color yellowish brown; hairs in small tufts in the center
of expanded sori.
Growing in tide pools in the lower littoral belt. On the west coast
of Mexico near the mouth of the Gulf of California.
Howe, in Britton and Millspaugh, Bah. Flor., 1920, p. 590; Setchell
and Gardner, Mar. Alg. Gulf of Calif., 1924, p. 727. Hydroclathrus
cancellatus Bory, in Diet, class., vol. 8, 1825, p. 419; Harvey, Phyc.
Austral., 1859, Tab. 98; Mitchell, in Murray, Phyc. Mem., part 2,1893,
pp. 53-56, pi. 15, figs. 2—4. Encoelmm clathratum (Bory) Agardh,
Sp. Alg., vol. 1, part 2, 1822, p. 412. Fucus clathratus Bory, MS.,
fide Agardh, loc. cit.
The single species of Hydroclathrus is tropical and widespread in
both the Atlantic and the Pacific oceans. Our specimens, from the
Gulf of California, are old and we have been unable to detect any
gametangia. T'
HERBARIUM DF
THE NEW YORK BOTANICAL GARDEN
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Hydroclathrus clathratus (Bory) How<
Setchell, W. A. & Gardner, N. L. Melanophycea»
Univ. Gallf. Pubi. Bot. &: 543, 1925
NEW YORK BOTANICAL GARDEN
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MARINE ALgXe OF PACIFIC BAJA CALIFORNIA
Ken^on-Williams Expedition 1946
Hydro cl athrus clathratus (Bory) Howe
Locality: isia Conchat Scammon Lagoon
Habitat-. Littoral» sand flats
Collected by Woody Williams
det. by E.Y.D.
April 24, 1946
2506
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MARINE ALGAE OF CALIFORNIA
Hydroclathrus clathratus (3orv) Howe
Locality: Santa Catalina Isl.
Habitat: Beach drift at Pebbly Beach near Avalon
Collected by E. Yale Dawson March 24« 1948 No. 4913
det. by E. Y. D.
ALGAE
DISTRIBUTED BY THE ALLAN HANCOCK FOUNDATION
THE UNIVERSITY OF SOUTHERN CALIFORNIA
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