Laurencia galtsoffii M.Howe

• Region

  Oceania

• Country

  United States of America

• State/Province

  Hawaii

• Locality

  Pearl and Hermes Reef, Sta. 68

• Coordinates

  27.8566, -175.856

• Coordinate Uncertainty (m)

  15471.6

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Pearl and Hermes Atoll. Measured from coord. to farthest extent of the atoll to find linear extent (15460 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

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Jour. Wash. AcacL. Sci. 24: 39, Ja 1934

JANUARY 15, 1934

HOWE: HAWAIIAN ALGAE

Laurencia galtsoffii sp. nov.10

C0-^Pact cushions 1-2 cm. high, branching irregular, for the
most part subdichotomous or somewhat corymbose, the main divisions

terete or subterete, mostly 0.46 to 0.78 mm. in diameter; terminal branches
cylindric and truncate-obtuse, 0.4-0.62 mm. in diameter, the younger oc-
casionally subturbinate; surface cells more or less hexagonal, becoming ob-
long in older parts, 35-110¿i in maximum diameter, cell walls 5-15^ thick,
cells rounded and nearly isodiametric in transverse section, about 30-52/li
high, usually lightly mammiform-protuberant in younger parts, walls of
medullary cells often with lenticular, arcuate, or somewhat annulate thick-
enings; other parts wanting. [Figure 5.]

On sand and coral bottoms, in ten feet of water, temp. 26.4°C., Pearl and
Hermes Reef, Station 68, Lat. 27° 52' 35" N., Long. 175° 47' W., Paul C.
Galtsoff, August 2, 1930. The original material, consisting of one clump of
more than one plant, is divided between The New York Botanical Garden
and the United States National Museum.

From Laurencia pannosa Zanard. of Sarawak, which we know only from
original description and figures, L. galtsoffii would appear to differ in its
cylindric rather than verrucaeform ultimate branches and in its more
dichotomous-corymbose branching; from L. nana Howe of the Bahama
Islands (this species also often has lenticular thickenings in the walls of
its medullary cells), in its absence of rhizoidal haptera and its coarser seg-
ments (0.4-0.78 mm. vs. 0.1-0.45 mm.); from L. pygmaea Weber-van Bosse,
of the Chagos Archipelago, in its more dichotomo-corymbose branching
and coarser segments; from L. humilis Setchell & Gardner of Clarion Island,
Revillagigedo Islands, in being much more slender and more freely branched,
in its more polygonal surface cells, and in the usually manifest lenticular
thickenings of the walls of the medullary cells; and from L. corymbosa J.
Ag. of the Cape of Good Hope, in its much smaller size.

Some of the plants grow attached to another species of Laurencia, pos-
sibly a reduced multifarious form of the following Laurencia sp.

10 Frondibus caespites compactas 1-2 cm. altas formantibus, plerumque irregulariter
ramosis, plerumque subdichotomis aut aliquando corymbosis, segmentis principalibus
teretibus aut subteretibus, plerumque 0.45-0.78 mm. crassis; ramulis terminalibus
teretibus truncati-obtusis, 0.4-0.62 mm. crassis, juvenilibus aliquando subturbinatis;
cellulis superficialibus a superficie visis plus minusve hexagonis, in partibus veteribus
oblongis, 35-110/* in diam. max., in sectione transversali suborbicularibus, circa

HOLOTYPE OF:

Vavi 0*. Go Risserò

JP

30-52m altis, in partibus junioribus plerumque leviter mammiformi-prominentibus,
parietibus 5-15ju crassis; cellularum medullarium parietibus incrassationibus lenticu-
laribus aut annularibus saepe instructis; partes aliae desunt.

In profunditate 3 m. in loco “Pearl and Hermes Reef” dicto, Oceani Pacifici, Lat.
27°52'35" Bor. Long. 175°47' Occ., Paul C. Galtsoff legit. Species L. pannosae Zanard.
forsitan affinis est.

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Fig. 5.—Laurencia galtsoffii. Type, top from fluid, lower same
material dried. Natural size.

BOTANICAL

Garde**

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