Rhizoclonium lubricum Setch. & N.L.Gardner

NEW YOF?-
ßOT ANIMAL

Rhizoclonium lubricum Setchell & Gardner,sp.nov.
Univ.Calif. Pubi .Bot .6:492.pl.42.f.5. 4 Ja 1919.

Filis flaccidis, lubricis, totaliter cylindricis,

3-4.5 dm. longis, laete viridibua; segmentis 35-50 p.,
vulgo 40 u diam.,quiescentibus 4-6 -plo diam.,post div-
isionem 1-2 plo diam, longis; chromatophoris parietal-
ibus laxe reticulatis; pyrenoideis parvis, numerosis,
in segmentis quiescentibus, 40-50; parietibus 2 u cras-
sis, homogeneis; ramis rhizoideis curtis non septatis,
cum cellulis generantibus continuis, sparsis; zoosporis
gametibusque ignotis.

Filaments flaooid, lubricous, straight, cylindrical
throughout, 3-4.5 dm. long, pale green; segments 35-50 u,
mostly 40 p. diam..resting segments 4-6 diam. long, after
division segments 1-2 diam. long; chromatophore a coarse,
parietal network; pyrenoids small, numerous, 40-50 in
resting segments; wall 2 thick, homogeneous; rhizoids
short, mere prolongations of cells, non septate, rare;
zoospores and gametes unknown.

Growing attached in mud, or floating on mud flats
between tides. Roche Harbor, Washington, and Berkeley
and Alameda, on the shores of San Francisco,Bay, Califor-
nia.

This form closely resembles H. riparium f. validum
Foslie, but is practically free from rhizoids, has thin-
ner walls and larger and longer segments. From 3. imple-
xum it differs in having broader, straighter filaments of
very different consistency, as well as usually longer seg-
ments. Unlike other species of Rhizoclonium, it is very
lubricous, in mass, having the consistency of a Spirogyr*

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Determined by Harry K. Phimigy

NEW YORK
BOTA NIC ai
G A R Dl. ti

Determined by Harry K. Phinney

ALGAE DISTRIBUTED FROM THE
HERBARIUM OF THE UNIVERSITY OF CALIFORNIA

76. Rhizoclonium lubricum S. & G.

Roche Harbor, San Juan Island, Washington.

N. L. Gardner, No. 4071. Aug. 1917.

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