Sii
118 ZYGOPHYOB^.
Cosmarium gemmiferum, Nordst. Desm. Spitz. (1872), p. 27.
H a b . In pools.
Lake District; Norway, Nova Zembla, Spitzbergen.
Plate X L I ., fig. 2.
d, end view.
living frond ; b, empty frond ; c, side view ;
. /
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M l
Cosmazium W ittz o ck ii. Lundell Lesm. Suec. 31, t. 3, f . 14.
Small, as long as broad, or a little longer, deeply constricted,
sinus broad rectangular ; semi-cells semi-elliptic, apex convex
or truncate, end view broadly elliptic, side view circular. Cell
membrane granulate, granules in longitudinal series, interrupted
at the isthmus ; amylaceous granule single.
Siz e . Length 18-22 g ; diam. 15-21 g (L .); length 15 g ;
diam. 12 g (Wille) ; length 22 g ; diam. 22 g (Wille) ; length
18-22 g ; diam. 15-21 g (K.).
Bennett Journ. K.M.S. (1886), p. 10, t. 1, f. 15. Wille
Norges Fers. (1880), p. 24. Wille Nova Sem. (1879), p. 44.
Wittr, Sottv. Alg. (1872), p. 58. Kirchn. Alg. Schles. (1874),
p. 152.
H a b . In mountain pools.
Lake District ; Germany, Sweden, Norway, Nova Zembla.
Plate X L I I . , fig. 8. a, living frond ; b, empty frond ; o, side view ;
d, end view.
Cosmazium n o ta b ile . Breb. in Britch. Infus. (1861), p. 733.
Frond about one-third longer than broad, constriction somewhat
deep, acute; segments slightly longer than broad, broadest
at the base, gradually narrowing upwards, sides convex, ends
truncate, rough all over with broad pearly granules, giving a
crenate appearance to the margin, endochrome in bands, end
view oval, tnrgid. Zygospore orbicular, beset with numerous
short stout spines, inflated at the base, and deeply divided at the
apex.
Siz e. Length 33-43 g ; diam. 25-32 g (K.) ; diam. 25-30
g (W o . ) .
Nordst. Norges Desm. (1873), p. 15. Nordst. & Wittr.
Desm. Ital. (1876), p. 41. Wille Nova Sem. (1879), p. 86.
Lemaire Desm. Vosg. (1883), p. 21. Wolle Desm. U.S.
(1884), p. 79, t, 16, f. 11. Kirchn. Alg. Schles. (1878), p. 152.
var, m ino z . Wille Nova Zem. (1879), g. 36, t. 12, / . 17.
Cells in side and end views with the apices rounded.
Siz e . Length 80 g ; diam. 20 g (Wi.).
H a b . In shallow pools.
DESMIDIE®. 119
Den of Gight; France, Germany, Norway, Italy, Nova
Zembla, United States.
Blate X L I I . , fig 12. a, living frond ; b, empty frond; c, end view ;
d, side view.
B. Frond not compressed, central constriction rarely a deep,
never a linear, incision, but merely the result of the form of
the contracted bases of the segments ; end view circular or
rarely compressed.
I I Frond rough.
Cosmazium o zb icu la tum . Balfs. Ann. Nat. Hist. (1844), xiv., p .
392, t. 11, / . 2.
Frond minute, in front view twice as long as broad; constriction
deep ; segments sphserical, rough all over, except at
the neck-like contraction, with pearly granules ; end view
circular. Zygospore orbicular, spiny.
Siz e . Diam. 20-33 g (Wo.); length 39 g; diam. 28 g (D.).
Ealfs. Desm. (1848), p. 107, t. 17, f. 5 ; t. 33, f. 9. Archer in
Prit. Inf. (1861), p. 735. Hassall Fr. Alg. (1845), p. 364.
Nordst. Desm. Gronl. (1885), p. 9. Delponte Desm. (1878), t.
7, f. 46-48. Wolle Desm. U.S. (1884), p. 77, t. 14, f. 20-21.
Lundell Desm. Suec. (1871), p. 46. Nordstedt Norges Desm.
(1873), p. 22. Wittrook Scan. Desm. (1869), 14. Brebisson
Liste Desm. (1856), p. 132. Eabh. Alg. Fur. (1868), p. 173.
Wille Norges Fers. (1880), p. 37. Lemaire Desm. Vosg.
(1883), p. 21. Kirchn. Alg. Schles. (1878), p. 153.
Perdum orhiculatum, Kutz.
H a b . In pools.
Sussex, Westmoreland, Wales, Cornwall; France, Germany,
Norway, Sweden, Greenland, Italy, United States.
Plate X L I I I . , fig, 1. a c, living fronds; b d, empty fronds ; e,
end view; f , zygospore.
Cosmazium m o n ilifo zm e .
Frond smooth.
{Turp.) Balfs. Lesm. (1848), p. 107, t.
17, / . 6.
Frond minute, in front view twice as long as broad, constriction
deep ; segments sphserical, smooth ; end view circular.
Zygospore globose, smooth.
Siz e . Length 26 g ; diam. 16-21 g (N.) ; diam. 16-24 g
(W o .); length 25-36 g ; diam. 18 g (D.) ; zygospore 37 g
(L,).
Wolle Desm. U.S. (1884), p. 6 0 ,1 .15, f. 16-19. Archer in
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