Oosmarium didelta, Meneg. Syn. Desm. (1840), p. 219.
H ab. In pools.
Kent, Sussex, Hunts, Westmorelund, Cornwall, Wales, Scotland
; France, Germany, Sweden, Norway, Russian Lapland,
Denmark, Italy, United States.
Flate X X X IV ., Jig. 1. a, living frond ; I e, empty fronds ; c, end
view ; d, side view.
E uastzum cu n e a tum . Jenner in Ralfs- Desm. (1818), p . 90, t. 32,
/.3 .
Frond large, rather more than twice as long as broad, segments
pyramidal, broadest at the base and narrowing upwards,
not lobed, the sides almost stra ig h t; ends truncate, central
notch linear. Empty frond without inflations.
S iz e . Length 118 g ; diam. 55 g (R .) ; length 96-100 g ;
diam. 47-50 g (L.) ; length 92-117 g ; diam. 45-62 g (K.).
Archer in Prit. Inf. (1861), p. 731. Lundell Desm. Snec.
(1871), p. 19. Nordstedt Norges Desm. (1873), p. 9. Rabh.
Alg. Eur. (1868), p. 187. Kirchner Alg. Schles. (1878), p.
159.
H ab. In pools.
Sussex, Wales, Scotland ; Germany, Sweden, Norway.
Plate X X X IV ., fig. 6. a, living frond ; I, empty frond.
E u a stzum an sa tum . (Fhr.) Ralfs. Desm. p. 85, f. 1 4 ,/. 2.
Frond about twice as long as broad ; segments inflated at the
base, tapering upwards without sinuations into a neck, and not
dilated ; rounded, its notch linear. Empty frond punctate,
turgid in the middle.
S i z e . Diam. 25-36 g (W.) ; length 76 g ; diam. 38 g
(R.) ; length 75-88 g ; diam. 37-41 g (K.) ; length 86 g ;
diam. 43 g (D.).
Ehr. Inf. (1838), 1 .12, f. 6. Archer in Prit. Inf. (1861),
p. 729. Delponte Desm. (1876), p. 101, t. vi, f. 31. Cleve
Sver. Desm. (1864), p. 485. Lundell Desm. Suec. (1871), p.
20. Nordstedt Norges Desm. (1873), p. 9. Nordstedt Desm.
Arct. (1875), p. 41. Wolle Desm. U.S. (1884), p. 99, t. 25,
f. 8-10; t. 29, f. 11, 12. Brebisson Liste Desm. (1856), p.
123. Notaris Desm. Ital. (1867), p. 85, t. 3, f. 14. Jacobsen
Desm. Denm. (1874), p. 190. Kirchner Alg. Sohles.
(1878), p. 158.
Euastrum Ralfsii, Eabh. Alg. Eur. (1868), p. 184. Petit
Liste Desm. Paris (1877), p. 81. Wood F. Water Alg® U.S.
(1872), p, 139. Wittrook Scan. Alg. (1869), p. 6.
Euastrum Unale, Kutz. Phy. Germ. (1845), p. 185.
Euastrum didelta, Ralfs. Ann. Nat. Hist. (1844), xiv., p. 190
(in part), t. 7, f. 2, c, d, e, f .
H a b . In pools.
Widely distributed iu England, Wales, Scotland ; France,
Germany, Norway, Denmark, Sweden, Russian Lapland, Italy,
United States.
Plate XXXIIL, Jig. 5. a, living fro n d ; i c, empty fronds j d, side
view; e, end view.
E u a stzum c iz cu la z e . Bass. Alg. (1845), g. 383, t. 9 0 ,/. 5.
Frond about twice as long as broad, tapering upwards into a
neck, end not dilated, its notch an acute incision. Empty semicells
with flve basal inflations, four in a semicircle around the
flfth, with two others at the extremity.
S i z e . Diam. 36 g (W .) ; length 82-90 g ; diam. 52-54 g
(K.).
Ralfs. Desm. (1848), p. 85 (partly), t. 14, f. 3a. Archer in
Prit. Iiif. (1861), p. 729. Kirch. Alg. Schles. (1878), p. 158.
Cleve Sver. Desm. (1864), p. 485. Notaris Desm, Ital. (1867),
p. 36, t. 3,f. 16. Grunow Desm. Aust. (1858), p. 501. Wood
P. Water Alg® U.S. (1872), p. 139. Wollo Desm. U.S.
(1881), p. 101, t. 28, f. 1, 2.
Euastrum circulare, var. Hassallii, Breb. Liste Desm. (1856),
p. 122. Rabh. Alg. Eur. (1868), p. 183.
Cosmarium circulare, Kutz. Spec. Alg. (1849), p. 174.
H ab. In pools and ponds.
Essex, Scotland; France, Germany, Sweden, Austria, Italy,
United States.
Plate X X X IV ., jig. 2. a, living frond ; 5 c, empty fronda.
E u a stzum sin u o sum . Lenor (1845), in Ralfs.
Frond about twice as long as broad, segments three-lobed,
basal portion emarginate at the sides ; end lobe somewhat
dilated, its notch linear. Empty frond punctate, semi-cells in
front view with flve basal inflations and two others at the extremity
; transverse view with three inflations at each side, and
one at each end.
S i z e . Length 76 g ; diam. 45 g (R.).
Archer in Prit. Inf. (1861), p. 729. Lundell Desm. Sueo.
(1871), p. 20. JaooFen Desm. Denm. (1874), p. 190.
Nordstedt Norges Desm. (1873), p. 9.
E u a strum circulare, var. ft., Ralfs. Desm. (1848), p. 85, t.
13, f. 5, a, b, d.
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