ü'
Platt, c e c i .
W . l i H ; . u P. Rceve, iraji.
P l a t e CCCI.
CHRYSYMENIA ROSEA,
Var. O r c a d e n s i s , Harv.
Gen. Ch a r . Frond tu b u la r, co n tin u o u s (n o t c o n stric ted or jo in te d ), filled
w ith a watery ju ic e , a n d trav e rsed by a few lo n g itu d in a l filam en ts;
its walls composed o f several rows of cells, th e in n e rm o s t of wliich
are d isten d ed a n d m u c h elongated, th e o u te r g rad u a lly smaller, and
th e superficial ones very m in u te . Fructification ; 1, ceramidia, co n ta
in in g a very dense tu f t of a n g u la r spores ; 2, tr ip a r te d tetraspores,
immersed in th e ram u li. Chrysymenia {J. Ag) ,— from xp^reos,
golden, an d vprtv, a membrane; because th e species assume golden
tin ts if steep ed for some tim e in fresh water.
C hrysymenia rosea, var. Orcadensis ; fronds distichous, pinnate, or hipin-
nate, th e main stem and the pinnæ and pinnules elliptic-oblong,
compressed ; pinnæ opposite.
C h r y sym en ia Orcadensis, Harv. Man. ed. 2. p. 100.
H ab. On rocks and Algæ in deep water. Annual ? At Skaill, Orkney,
Miss Watt. On a root of Laminaria digitata, adhering to a large
stone, dredged in eight fathoms, Sanda F rith , Orkney (growing with
Rliodymenia cristata), Messrs. Thomas and M 'B a in .
Geogr. D is t r . Only known in the above localities.
Desc r. Boot fibrous, branching. Fronds (in the only specimens yet seen) from
three-quarters ot an inch to an inch and a half in height, a quarter of an
inch in breadth, compressed, undivided, oblong, rounded, or bluntly pointed,
but not attenuated at the summit, once or twice pinnate with similarly-
shaped frondlets. Frondlets opposite, at first ovate, becoming oblong as
they grow, distichous. Substance delicately membranaceous, closely adhering
to paper. Colotir a bright rosy red, preserved in drying. Fructification
unknown.
When the plate now given was prepared and lithographed, I
was only acquainted with the few imperfect specimens first discovered,
and noticed, under the provisional name “ Orcadensis,”
in the recently published edition of the ‘ Manual ’; but witbin
the last month (August) two obliging correspondents, Mrs. Gatty
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