Cosmazium pyzamidatum. Breb. in Balfs. Besm (1848), g. 94, i.
15, / . 4.
Frond scarcely twice as long as broad, suboval, constriction
deep, linear ; segments pyraiuidal, rounded at basal angles,
somewhat truncate at the ends, punctate ; end view broadly
elliptic. Zygospore orbicular, tuberculate.
Siz e . Length 79 g ; diam. 46 g (D.) ; diam. 50-85 g
(W .); length 43-66 g ; diam. 26-43 g (N.).
Breb. Liste Desm. (1856), p. 126. Wille Norges Alg.
(1880), p. 35. Nordst. Desm. Bras. (1869), p. 210. Archer
in Prit. Inf. (1861), p. 731, t. 3, f. 14, 15. Delponte Desm.
(1878), t. 9, f. 30-33. Cleve Sver. Desm. (1864), p. 487.
Lundell Desm. Suec. (1871), p. 41. Wolle Desm. U.S.
(1884), p. 69, t. 14, f. 16, 17. Nordstedt Norges Desm.
(1873), p. 18. Petit Liste Desm. Paris (1877), p. 30.
Grunow Desm. Austr. (1858), p. 501. Wood P. Water Alg®
U.S. (1872), p. 130. Wittrook Scan. Desm. (1869), p. 10.
Notaris Desm. Ital. (1867), p. 40, t. 3, f. 22, 23. Eabh. Aig.
Eur. (1868), p. 162. Jacobsen Desm. Denm. (1874), p. 199
(partly). Kirchner Alg. Schles. (1878), p. 149. Sohaarschm.
Magy. Desm. (1882), p. 268. Lemaire Desm. Vosg. (1883),
p. 21.
PithiscuB angulosus, Kutz. Phy. Germ. (1845), p. 129.
Cosmarium ovale, Ealfs. Ann. Nat. Hist. (1844), xiv., p. 394
(partly), t. 11, f. 7, a, 5, c.
Cosmarium pyramidatum b typicum, Klebs. Desm. Pruss.
(1879), p. 31.
H ab. In pools.
Kent, Sussex, Surrey, Cheshire, Westmoreland, Lancashire,
Cornwall, Wales, Scotland ; France, Germany, Sweden, Norway,
Denmark, Austria, Italy, Hungary, United States, Brazil.
Plate X X X V I ., fig. 13. a, living frond; b, empty frond; c, side
view ; d, end view.
Cosmazium pseudop y zam id a tum . Lund. Lesm. Suec. (1871), p.
41, i. 2 ,/ . 18.
With, th e habit of C. pyramidatum, h u t much sm a lle r;
membrane delicately punctate, amylaceous granule single.
S ize. Length 44 g ; diam. 28 g (L .) ; length 60 g ;
diam. 33 g (N.). v j , b g ,
Nordst. Norges Desm. (1873), p. 19. Nordst. Desm. Arct.
(1875), p. 19, 38. Wittrock Sottvat Alg. (1872), p. 60.
Archer in Journ. Bot. (1874), iii., 93. Nordst. & W ittr.
Desm. Ita l. (1876), p. 32. Nordstedt Desm. Spitz. (1872),
DESMIDIB®. 87
p. 29. Wolle Desm. U.S. (1884), p. 69, t. 15, f. 11, 12.
Wille Norges Alg. (1880), p. 34. Sohaarschm. Magy. Desm.
(1882), p . 268.
Cosmarium pyramidatum ß minus, Eeinsoh. in Rabh. Alg.
Eur. No. 1902. Jacobsen Desm. Denm. (1874), p. 199.
Cosmarium pyramidatum, Ralfs. Desm. (in p a rt), t. 15, fig.
4, d, e, f .
H ab. Mountain pools.
Lake District, Ireland ; Sweden, N orway, Ita ly , Hungary,
Spitzbergen, Nova Zembla, United States.
Blate X X X V I I . , fig, 2. a, living frond j b, empty frond; c, side view;
d, end view.
Cosmazium g a le z itum . Nord. Lesm. Brazil (1869), p. 209, t. 3,
f. 26.
Medium size, somewhat orbicular, about one third part
longer than broad, with a linear sinus, widened at the extremity
; semi-cells semi-orbicular, dorsal margin rounded-
truncate, sides very slightly convex or straight, lower angles
obtuse, end view elliptic, side view circular.
Siz e . Length 51-54 g ; diam. 42-45 g (N.) ; diam. 40-55 g
(W.).
Wolle Desm. U.S. (1884), p. 70, t. 16, f. 46-48. Wille
Norges Alg. (1880), p. 35. Nordstedt Alg. Brazil (1877), p.
20.
H ab. In springs and ponds.
North Wales ; Brazil, United States.
Plate X L I I , fig. 14. a, living frond ; b, empty frond; c, side view;
d, end view.
Cosmazium p seu d o n itid u lum . Nordst. Norges Lesm. (1873), p
16, t. 1, / . 4.
Medium size, with the habit of C. nitidulum; one fourth part
longer than broad, deeply constricted with a narrow linear sinus,
widened at the extremity ; semi-cells somewhat trapezoid, attenuated
from the broad base to the rounded truncate apex, lower
angles rounded, end view elliptic, side view ovate-circular, membrane
punctate.
Siz e. Length 42 g ; diam. 33 g (N.) ; diam. 38 g (W.).
Cooke in Quekett Journal (1880), p. 211, t. 13, fig .l, a, b.
Wolle Desm. U.S. (1884), p. 62, t. 18, f. 19. Wille Norges
Alg. (1880), p. 33.
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