植物學雑誌第五雀第五十二號
明治廿四年六月十日
THE
[Vol.
BOTANICAL
®.
June
MAGAZINE,
No.
10, 1891.
A New Japanese
5 2. ]
Prasiola1
Rydkichi Yatabe, Sc. D.
Prasiola japonica, nov. sp.
Nor. fap.
Kawa-nori,
, y. ; r) .
ULVACE.
(Plate XXV.)
Thallus expanded, delicately membranaceous, ovate, oblong, linear-oblong,
lanceolate, or irregularly lobed, crispate at the margin, bright green, 1-2o cm.
long, 0.5-4 cm, broad.
in fours.
specimens
the
thallus
lobed
and
plicately
variously
rocks
by
scope
shows
a minute
that
diameter.
irregularly
Its
thallus
point.
the cells
margin
is
notched.
of cells which
the
about i Ia, in diameter, arranged
Attached to rocks in clear rapid stream.
In small
often
Cells subquadrate,
and at that
less thickened
point
surface
generally
the thallus
at the
section
lower
is attached
ends.
but in larger
is attached
in fours
undulate,
shows
Towards
downwards
by means
that
ones
to the surface
of the thallus
arranged
slightly
elongated
or oblong,
It
view
are generally
as long as broad.
cells become
ovate
crispate.,
Its transverse
are twice
the
The
is mostly
under
the
and about
but
the point
micro7 ,a. in
in some
it consists
of
cases
of one layer
of attachment
into slender
colorless
of entangled
fibres
of
fibres.
more
or
(j 88)
A NEW JAPANS PRASYOLA.
From the diagnoses of ~e-Toni'
and Wollet it seems that this species is
nearly auied to P. me%icana, LMiebm.
This alga grows in rapid streams in mountainous parts of the country.
My specimens are from NikkO (province of Shimotsuke), Kiriu (KOzuke),
Shibakawa
(Suruga),
I)aiyagawa,
at N ikkO, is well known as one of the localities where this alga
grows abundantly.
and Oimura
(Mino).
The
ravine
known
as the
The specimens figured are two of those kindly collected for
me by Mr. I. Ogasawara,
He sent to me early in March, 1891, a stone
about 30 cm, in diameter,
on which was growing a number of this alga.
The stone was taken from the Kiriu-gawa, a rapid stream near the town of
Kiriu.
In the districts where this alga grows people collect it in large quantities
especially in autumn, press and dry it into the form of quadrangular sheets, and
sell them as an article of food under the names different in various localities,
such as Kawa-nori,
Shibakawa-nori,
,Daiyag awa-nori, &c.
They are eaten
either slightly broiled or vinegared after putting them in water.
The sheets
sent from Kiriu are 32 cm, long ad 26 cm, broad; those from Shibakawa, 48
cm, long and 28 cm, broad; those from NikkO, 48 cm, long 34 cm, broad;.
They are not so commonly sold at shops as the sheets similarly prepared from
Porphyra and Enteromospha, common forms ~ofalga in the shallow sea.
According to Mr. I. Ogasawara who has written to me in regard to this
alga, it is generally about r o cm. long, but larger specimens are 20 cm. or
more long.
It can be collected from the time of the year when the frost first
* De-Toni , Sylloge
f Wolle, Fresh-Water
Algarum,
vol. i., p. I43•
Algae, p. 107, t. 91.
日
本
藻
局
方
植
disappears till the time when it again forms.
物
篇
(189)
But the specimens collected in
spring and summer cannot be so well preserved for use as those collected in
autumn, which can be preserved for °a long time and have a more agreeable
odor.
The quantity gathered
at the locality where Mr. Ogasawara resides
inssmall., amounting in value only to about $ 140 to $ i 50 in a year.
Plate XXV.
Fig, i, 2, whole plant (nat. size); 3-6, surface views of
different parts of thallus;
3, margin (x 4.20); 4, same (x 560); 5, middle
portion (x 420; 6, base (x 240); 7, transverse section of thallus (x 4.20).
日本藥局方植物篇
(前號の綾き)
會員
第五十一號正誤(162)ノ
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