I ’ ) i
I l I
Co smaiium cambricum. Cooke Wills in Grevillea ix. (1880),
p. 91.
Frond longer than broad, constriction linear, segments
quadrilateral, narrowed from the base, sides with two sinuations,
and one in the centre of the apex, the latter rather the broadest.
Side view oval, narrow, rounded at the ends, with a shallow
constriction. End view elliptical. Cell membrane minutely
punctate.
Size. Length 46-48 g diam.; 36-88 g at the base; 20-22
g at the apex.
H ab. Mountain pools.
North Wales.
Flate X L I I , , fig. 16. a, living frond ; i, empty frond; c, side view ;
d, end view.
Cosmazium tetzagonum. Nag. Finn. Alg., p. 119, t. 7, fig. A, 5,
Frond in front view about twice as long as broad, oblong,
constriction linear; segments subquadrate, somewhat narrowing
from the base, sides and end each with three slight sinuations,
those of the ends rather smaller, in each half one large central
granule ; side view segments oval, rounded, constriction shallow.
Siz e . Length 45-48 g ; diam. 22-26 g.
Archer in Prit. Inf. (1861), p. 732. Nordstedt Norges Desm.
(1873), p. 19. Nordstedt Desm. Arct. (1875), p. 40. Nordst.
& Wittr. Desm. Ital. (1876), p. 35. Eabh. Alg. Eur. (1868),
p. 164. Schaarschm. Magy. Desm. (1882), p. 269.
Euastrum tetragonum. Nag. Einz. Alg. (1849), p. 119, t, 7,
f. A, 5.
H ab. In pools.
Lake District; France, Germany, Russian Lapland, Norway,
Hungary, Italy.
Plate X X X V I I . , fig. 17. a, living frond; I, empty fro n d ; e, side
view ; d, end view.
var. L u n d e llii. Cooke.
Form with the apices somewhat protracted; sides of the
semi-cells very slightly bisiniiate, upper angles straight, intermediate
obtuse-angled.
Siz e . Length 42-46 g ; diam. 27 g. (L.).
Cosmarium tetragonum, N ag ./om a , Lundell, t. 2, f. 21.
Quart. Journ. Mic. Sci. xvii. (1877), p. 102. Nordst.
Desm. Gronl. (1885), p. 8.
H ab. In pools.
Scotland, Ireland; Germany, Greenland.
Plate X X X V I I , fig. 18, a, living fro n d ; I, empty frond; c, side
view; d, end view.
Cosmazium monomaxum. Lnnd. Lesm. Suee., p. 32, t. 3 ,/ . 11.
About medium size, about as long as broad, or a little longer,
deeply constricted, with a very narrow linear sinus ; semi-cells
hexagonally elliptic, apex truncate in the middle, convex,
dorsal, and lateral margins delicately crenulate, with about 16
crenations ; basal margin entire and obliquely truncate, with a
single papilla in the middle ; end view narrowly elliptic, with a
single papillæ in the middle on each side, and a row of bifid
papilla in a longitudinal series within the margin on each side ;
ends sub-truncate, with a small papilla at each angle ; side
view circular, with two papillæ on each side, one medial, the
other near the apex.
Siz e . Length 38 g ; diam. 34 g (L.).
H ab. Mountain pools.
Sweden.
var. |8. p olymazon. Nordst. Norges Lesm. (187S), p . 14, fi. 3.
H ab. Mountain pools.
Lake District ; Norway.
Plate X X X V I I . , fig. 19. a, living frond ; 5, empty frond ; e, side
view ; d, end view.
* * Fronds rough on the surface with pearly granules, which
give a denticulate appearance to the margin.
Cosmazium te tz a op h th a lm um . Breh. in Ralfs. Lesm. (1848), p.
98, t. 1 7 , / 11 ; t. 33, / . 8.
Frond about a third longer than broad, constriction deep,
linear ; segments forming nearly two-thirds of a circle, rough
on the surface with short and broad scattered pearly granules
giving a crenate appearance to the margin ; end view broadly
elliptic. Zygospore orbicular, spinous, spines swollen at the
base, finely branched.
S i z e . Length 61-115 g ; diam. 50-79 g (D.) ; diam. 60-78
(Wo.) ; length 120 g ; diam. 80 g ; length 110 g ; diam. 70 g
(0 .).
Brebisson Liste Desm. (1856), p. 127. Maskell N. Zeal.
Desm. (1882), p. 242. Archer in Prit. Inf. (1861), p. 732.
Delponte Desm. (1878), t. 9, f. 1-4. Nordstedt Desm. Arct.
(1875), p. 17 (var.) 40. Cleve Sver. Desm. (1864), p. 488.
Lundell Desm. Suec. (1871), p. 27. Nordstedt Norges Desm.
(1878), p. 12. Petit Liste Desm. Paris (1877), p. 30. Wittr.
Sottv Alg. (1872), p. 56. Lemaire Desm. Vosg. (1883), p. 19.
Wolle Desm. U.S. (1884), 75, t. 13, f. 13. Grunow Desm.
Austr. (1858), p. 501 ; Wood P. Water Algæ U.S. (1872), p.
129, Wittrock Scan. Desm. (1809), p. 12. Notaris Desm.
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