Antithamnion densiusculum N.L.Gardner

• Region

  North America

• Country

  United States of America

• State/Province

  Washington

• County/Municipio

  Pierce Co.

• City/Township

  Tacoma

• Locality

  Point Defiance

• Coordinates

  48.8753, -120.602

• Georeferencing Method

  Other source.

• Distribution

  Map all specimens of this taxon

NEW YORK

Antithamnion densiusoulum Gardner sp. nov.	_

Univ. Calif. Putol.Bot.13j374.pl.7B.f.2. 27 S 1927.

fronds up to 20 cm.high, with at least four orders
of 'branches; main axes 340-360 diam., with cells slight-
ly swollen at the nodes and 3-5 times as long as "broad;
ranrali in whorls, usually of three, from every cell of the
main axes and "branches and densely fasciculate, resulting
from repeated opposite "branching at the "basal cell ; ramuli
strict, especially the upper ones, tapering gradually from
the "base to the very sharp apices, rigid, with cells slightly
dolioform, 2-3 times as long as broad, thin walled; "basal
cells of the main ramuli 65-75 u diam.; tetrasporangia "borne
on small, specialized ramuli on the adaxial side of the
ultimate and subultimate ramuli, broadly ellipsoidal to sub-
spherical, 85-95 }i diam.; cystocarps and carpospores sub-
spherical; antheridia unknown; gland cells numerous, terminal
on the specialised fructiferous ramuli.

Growing on rocks and on other algae in the extreme lower
littoral and upper sublittoral belts, puget Sound and the Straits
of Juan de Fuca. Type, Gardner, no. 2195 (Herb.Univ. Calif, no.
296630). Type locality, point Defiance, Tacoma, Washington.
Collected in May 1910.

Antithamnion subulatum Setchell and Gardner, Alg. IT.W.
Amer.,1903, p. 342, as to N.l.G. no. 922; Collins, Alg.

Vancouver Is.,1913, p. 124. (lion A subulatum Collins, Holden,

and Setchell, phyc. Bor.Amer, "Sxsicc. no. 944.)

This species of Antithamnion is much more rigid and
robust than any other known species on the.whole west coast
of Forth America. It may be further distinguished from other
species by the strict rigid, straight, long-acuminate, ultimate
ramuli with relatively long, slightly dolioform cells, the terminal
one being very small and sharp. The cell walls are very thin.

The illustration on plate 75 represents but a part of a tetra-
sporic plant. The gland cells start on the small apical cells
of the fructiferous ramuli, absorbing them completely and finally
becoming terminal.

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00937458

Herbarium of the University of California

---NEW YORK

ALGiE OF Washington BOTANICAL

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Antihamnion aensiusculum Gardner
A
Point Deiiance, Tacoma
May 1910
Li. L. Gardner i<o. 2195, Go-type

00937458