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ri.l .
■ > ■ t: :
Cosmaxium quadxum. Lundell Besm. Suec, (1871), p- 25, t, 11,
/ . 11.
Rather large, about as long as broad, deeply constricted, with
a narrow linear sinus, rather quadrate, apex very slightly retuse,
sides almost straight, angles very broadly rounded, in side view
each pole is rounded, and the middle broadly excavated, semicells
with a straight contiguous base, lower angles rectangular,
lateral margin crenate, dorsal margin densely crenulate, end
view oblong. Membrane densely warted, warts in quincuncial
order (about 17 longitudinal rows).
Siz e . Length 73-78 g ; diam. 70-72 g (L.) ; length 78
diam. 62 g (C.).
Nordst. Norges Desm. (1878), p. 11. Lemaire Desm. Vosg.
(1888), p. 19.
H ab. In ponds.
N. Wales ; France, Sweden, Norway.
Plate X L I I ., fig. 1. a, living fro n d ; I c, empty fronds.
Cosmazium q u a zte znarium. W itt. ^ Nord. in Alg. Fxsicc.,
fasc. 7.
Rather large. A little longer than broad, deeply constricted
in the middle, with a linear sinus, dilated at the extremity ;
semi-cells somewhat trapezoid, sub-reniform at the base. Apex
broadly truncate, without granules, inferior angles obtuse y
rounded, superior rounded, sides a little convex, granulately
crenate, membrane rough witb rather small radiating granules,
with a central circular area, scrobiculate with connected granules ;
end view elliptic; side view circular. Chlorophyll with four
parietal lamin®.
Siz e . Length 58-65 g ; diam 38-40 g (N. & W.).
Grevillea ix. (1881), p. 102.
H ab. In ponds.
N. Wales ; Italy.
Plate X L I I . , fig. 5. a, living frond ; h, empty frond j c, end view.
Cosmazium m a zg a z itife rum . (Turp.) Meneg. Syn. Lesm. (1840),
'p. 219.
Frond about as long as broad, constriction deep, linear ; segments
reniform or semi-orbicular, rough all over with round and
scattered pearly granules ; end view elliptic. Zygospore orbicular,
spinous, with branched spines.
Size. Length 25-60 g ; diam. 26-50 g (D.) ; diam. 25-50 g
(Wo.), 25 X 26 g to 60 X 50 g (C.).
Ralfs. Ann. Nat. Hist. (1844), xiv., 1 .11, f. 4. Ralfs. Desm.
(1848), p. 100, t. 16, f. 2 ; t. 33, f. 3. Archer in Prit. Inf.
(1861), p. 733, t. 1, f. 1. Delponte Desm. (1878), t. 9, f. 5-9.
Cleve Sver. Desm. (1864), p. 488. Wolle Desm. U.S. (1884),
p. 74, t. 13, f. 1-3. Lundell Desm. Sueo. (1871), p. 25. Nordstedt
Norges Desm. (1873), p. 11. Petit Liste Desm. Paris
(1877), p. 30. Grunow Desm. Austr. (1858), p. 501. Wood
F. W ater Alg® U.S. (1872), p. 127. Wittrook Scan. Desm.
(1869), p. 12. Brebisson Liste Desm. (1856), p. 129. Notaris
Desm. Ital. (1867), p. 44, t. 4, f. 29. Rabh. Alg. Eur.
(1868), p. 157 in part. Jacobsen Desm. Denm. (1874), p. 193
partly. Kirchner Alg. Schles. (1878), p. 150. Nordst. Desm.
Braz. (1869), p. 207. Wittr. Sottv. Alg. (1872), p. 56. Schaarsohm.
Magy. Desm. (1883), p. 264. Lemaire Desm. Vosg.
(1883), p. 19.
Ursinella margaritifera, Turp. Diet. Sc. Nat. (1820), f. 23.
Mem. de Mus., p. 295, t. 13, f. 19.
E u a strum m a rg a ritife rum ,U h x . Abh. der Berl. Ak. (1833), p.
246. Ehr. Inf., p. 163, t. 12, f. 7.
M icrasterias margaritifera, Breb. Alg. Fal. (1835), p. 55, t. 7.
Cymhella reniformis, Ag. Consp. Diat. (1830), p. 10. Harv.
Br. Alg., p. 215.
H ab. In ponds, ditches, &c.
Common throughout England, Wales, Scotland; France,
Germany, Sweden, Norway, Denmark, Austria, Italy, Hungary,
Brazil, Mexico, United States.
Plate X X X IX . , fig. 2. a, living frond ; I, empty frond; c, side view ;
d, end view ¡ e, zygospore.
Cosmazium P o z tian um . Archer in Pritch. Infius. (1861), p . 733.
Frond about one-third longer than broad, constriction deep,
wide; somewhat round below, isthmus forming a short neck;
segments elliptical, rough all over with minute scattered pearly
granules; end view elliptic. (Zygospore orbicular, beset with
somewhat elongate conical blunt spines.)
Siz e . Length 40 g diam., 2 5 g (A .); diam. 25-83 g (Wo.) ;
length 40 g ; diam. 30 g [C.).
Mior. Journ. viii. (1860), p. 235, t. 11, f. 8, 9. Nordstedt
Desm. Arct. (1875), p. 18. Lundell Desm. Sueo. (1871), p.
46. Nordstedt Norges Desm. (1873), p. 22. Nordst. & Wittr.
Desm. Ital. (1876), p. 28. Rabh. Alg. Eur. (1868), p. 160.
Wille Nov. Zem. (1879), p. 34. Wille Norges Fers. (1880),
p. 24. Wittr. Sottv. Alg. (1872), p.
Vosg. (1883), p. 21. Wolle Desm. U.i
f. 12-14.
H ab. In pools.
57. Lemaire Desm.
. (1884), p. 77, t. 14,
I