Near Manchester: A h . Sidebotham. Dolgelly: Air,
Ralfs. High Beech: A. II. II.
A very distinct species. The frond is usually about a
third less than tha t of Cosmarium margaritifei'um.
3 . COSMAKIEM OENATUM Rolfs.
Plate L X X X V I . Pig. 3.
Char. Frond denticulated. Segments broader than long.
F ro n t view curved at the sides, hut truncate at the extremities.
End yiQXY, fou7--lohed.
Cosmarium ornatum Kalfs, in Annals, vol. xiv. p. 392. pi. xi.
fig. 3 .; Jenner, in Fl. of Tunbridge Wells, p. 194.
Ilab. In boggy pools about Dolgelly and Barmouth:
Air. Ralfs. Ashdown Forest, Sussex : Air. Jenner.
Cheshunt Common: A. II. II.
This species is likewise very distinct, and there can be no
danger of confounding it with any other hitherto described.
The fronds are about as large as those of C. margaritiferum,
the four-lobed form of the segment when viewed endways is
peculiar to the species ; this form is occasioned by the central
infiation of each segment.
4 . C o sm a r ium o r b ic u l a t u m Ralfs.
Plate L X X X V I . Fig. 5.
Char. Segments minute, nearly spherical, both in fro n t and
end views.
Cosmarium orbiculatum Kalfs, in Annals, vol. xiv. p. 392.
pi. xi. fig. 2.
Ilab. Boggy pools, near Dolgelly: Mr. Ralfs. Near
INIanchester: Mr, Sidebotham. *
A distinct little species, and the smallest of the genus.
5. C o sm a r ium c y l in d r ic u m Ralfs.
Plate L X X X V I . Fig. 4.
Char. Fronds small, finely denticulate. Segments longer
than hroad, in the fro n t view, suhquadrate, broadest at the
extremitg, narrower at their junction. End view circidar.
Cosmarium cylindricum Kalfs, in Annals, vol. xiv. pi. xi.
f. 1.
Hah. Mixed with other A lga on the wet sides of a cave
at Laurarna Cove near Penzance: Mr. Ralfs.
The fronds are minute, and about twice as long as hroad.
Segments united along their entire breadth, so th a t no
notches are formed at the sides.
b. Fronds mostly punctated or smooth.
6. C o sm a r ium c e e n a t u m Ralfs.
Plate L X X X V I . Fig. 6.
Char. Y voxxAb punctated. Sagmanis broader than long, compressed,
somewhat triangular, with the margins deeply cre-
nated. End view elliptic.
C. crenatum Kalfs, in Annals, vol. xiv. pi. xi. fig. 6. ; J e n ner,
loc. cit. p. 196.
Hab. Weston bogs, near Southampton, and several stations
in Sussex : Mr. Jenner, Near B ris to l: Mr. Thwaites.
Near Manchester: Mr. Sidehotham. Dolgelly and P enzance
: Mr. Ralfs.
“ This plant very much resembles a young specimen of
C. margaritiferum; but as the margin is always strongly
crenated, even in the earliest stage, and the surface is punctated
and not granulated, I am induced to describe it as dis-
.tinct.” — Ralfs.