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Callidictyon abyssorum, gen. et sp. nov. (Rhodophyta), A New Deep-water Net-forming Alga from Hawai'i

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Title:Callidictyon abyssorum, gen. et sp. nov. (Rhodophyta), A New Deep-water Net-forming Alga from Hawai'i
Authors:Norris, James N.
Abbott, Isabella A.
Agegian, Catherine R.
Date Issued:Apr 1995
Publisher:University of Hawaii Press
Citation:Norris JN, Abbott IA, Agegian CR. 1995. Callidictyon abyssorum, gen. et sp. nov. (Rhodophyta), a new deep-water net-forming alga from Hawai'i. Pac Sci 49(2): 192-201.
Abstract:Callidictyon abyssorum, gen. et sp. nov., an unusual, net-forming
red alga, is described from deep-water Pacific collections made from the research
submersible Makati'i at 80-m depths on Penguin Bank, off the island
of Moloka'i, Hawai'i. Though no reproductive structures were found, the new
genus shares vegetative similarities with three tribes of the Ceramiaceae. The
vegetative structure of C. abyssorum is similar to that of genera of the tribe
Antithamnieae in having: (1) distinct basal cells on all primary lateral branches
that are isodiametric and smaller than other cells of the primary laterals; (2) a
central axis that is prostrate except for the portions near the apices of branches;
and (3) axes that are completely without cortication. Some characters of C.
abyssorum also suggest affinities to genera of the Callithamnieae, including: (1)
the oblique apical cell division resulting in a strictly alternate branching pattern;
(2) the absence of gland cells; and, (3) the presence of short, branching
rhizoids on the basal cells of the primary lateral branches and long slender rhizoids
on the main axial cells. Finally, the regularly alternate branching pattern,
blunt apices, formation of anastomoses, and different .types of rhizoidal filaments,
all characteristics of C. abyssorum, are also features present in members
of the Compsothamnieae. Based on vegetative features, Callidictyon is tentatively
placed in the Ceramiaceae until reproductive structures are found.
Appears in Collections: Pacific Science Volume 49, Number 2, 1995
Abbott, Isabella A.

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