Ulva spinulosa Okamura & Segawa

"On the Marine Algae of Snsaki, Prov. Izu, & its Vicinity II«”
By S. Segawa
Scientific Papers, Inst« Alg. Res. Fac« of Sci. Hokkaido Imp« Univ.
Vol. 1 no. E; Mr. 1936«
ÌJ	Having the microscopic teeth in the frond, the present species is
sufficiently different to be separated from other ones (exclusive ol l Iva
rei iodata Forsk.) belonging to this genus. l>ut it must be described pio-
visionally, for the former authors who described the species of l Iva, might
have overlooked this fine character in their observations.
ULVACEAE	.
4.	Ulva spinulosa Okamuka et Segawa sp. nov.	Text-figs. 2-3.
Frons stipitata vel subsessilis, cito vage expansa, palmatim vel irre-
gnlariter lobata, margine plus minus undulata et i)licata. hie illie
minutissime dentata,
tiliterque dentata.
Japanese name.
11 a b. On the rocks near high tide, ^liyake-sima.
Pig. 3. Viva spinulosa Okajiura ct Segawa.
A. Cross-section of the frond through one tooth, x 1-10.
,	B, C. Suvfaee-view of the teeth. xlôO.
i lg. 2. I ha spinulosa
„	„	P. Longitudinal section of the upper part of the frond.
Oka ai. et Segawa. xl.
x 250.
Frond fresh green, minor. 2-3 cm high, 360/i thick at the basal portion.
65-82u thick at the middle, sessile or having a short stipe, soon expanding
upwards in a circular leaflet, dividing palmately or irregularly into some
lobes; margins somewhat undulato-plicate, with microscopic teeth here and
there; cells polygonal in surface view, roundish rectangular or squarish in
cross section, 25-34/; long, 11-23// wide, with thickened outer wall (3-6/0-
NEW YORK BOTANICAL GARDEN
02140658
02140658