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1925] Setchell-Gardner : Melan&phyceae 521
zontally into two. The fructiferous cells remain undivided. The
undivided cortical cells are about the same shape and size as the
medullary cells which also vary in shape and size.
6. Punctaria chartacea S. and G.
Plate 45, fig. 79, and plate 81
Fronds more or less finely bullate, membranaceous, chartaceous,
linear to broadty elliptical, base often cordate, margins finely fimbriate,
25-35 cm. (up to 50 cm.) long, 8-12 cm. (up to 30 cm.) broad, mature
plants 90-1 20ju, thick, attached by a very small disk ; composed of 6-7
layers of cells, the surface cells being much smaller than the medullary
cells; cell Avails thick, of light brown color, with intercellular spaces
among the medullary cells ; color dark brown, not changing on drying,
not adhering at all to paper; hairs, zoosporangia and gametangia
unknown.
Growing on Eel grass in the lower littoral and upper sublittoral
belts. Sitka. Alaska.
Setchell and Gardner, Phyc. Cont., VII, 1924, p. 4.
This species of Punctaria was found in great abundance, both
attached and floating. A large number of specimens were examined
in the last part of June and no reproductive cells could be found.
Neither were any hairs observed.
7. Punctaria expansa S. and G.
Plate 49, fig. 19
Fronds gregarious, broadly expanded, more or less circular in out-
line, 20-30 cm. broad, 100-1 30/x thick, very fragile, of medium brown
color, fading to green very soon after removal from water, composed
for the most part of four layers of cells, the medullary cells being
much larger than the cortical cells; neither the medullary nor the
cortical cells arranged in any definite series; cortical cells four to six
sided and 30-40^ diam. in surface view ; zoosporangia and gametangia
on the same frond, the former projecting but slightly beyond the sur-
face, the latter more or less conical and projecting one-half or more of
their length beyond the surface ;
hairs present but sparse.
Growing in a small quiet cove at the head of Penn's Cove, Whidbey
[gland, Washington.
Setchell and Gardner, Phyc. Cont., VII, 1924, p. 5. Punctaria
latifolia Setchell and Gardner, Alg. N.W. Amer., 1903, p. 240 (in part).