Ulvella lens P.Crouan & H.Crouan

PLATE 33
Vlvella Lens Crouan
A micro-photograph showing plants in various stages of development. X 200.
NEW YORK
botanical
garden
UNIV. CALIF, PUBL. BOT. VOL.
[ SETCHELL-GARDNER ] PLATE 33
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Ulvella Lens Crouan
Plate 33
Thallus orbicular, bright green, 150-250/i, up to 1.5 mm. diam.;
marginal segments usually cuneate, 3.5-4.5/i diam., 15-25/* long with
terminal growth, central segments 8-15/i diam.
Growing firmly attached to Laurencia sp. in the upper sublittoral
belt. Central California (Pacific Grove).
296
University of California Publications in Botany [VoL- 8
Crouan, loc. cit.; Huber, Contributions des Chaetophorées, 1892,
p. 294 et seq., pl. 11, f. 4-6; Collins, Green Alg. N. A., 1909, p. 286;
Wille, Nachträge, 1909, p. 89.
We feel compelled to refer here a plant found in abundance on a
species of Laurencio, at Pacific Grove, California, in July. In gen-
eral appearance, in structure, in dimensions of the cells and manner
of peripheral growth, the specimens correspond exactly with the
figures and description of Iluber {loc. cit.) for the type material of
Vlvella Lens. Our plants, however, have only been detected, thus
far, as epiphytes. We have seen, in our preserved material, the central
cells both empty and divided into 8 rounded bodies, probably zoo-
spores. Unfortunately we have not preserved specimens in a con-
dition suitable for the study of the number of nuclei in the cells.
New York Botanical Garden
NEW YORK BOTANICAL GARDEN
02140713
02140713