T
68 ZYGOPHYOE®. DESMIDIE®. 69
between them and the end loho on each side, a tnherole re presenting
middle lohes, the upper margin of which is horizontal
; end lobe exserted, dilated, its notch linear. Empty
frond minutely punctate. Semi-cells with four basal in flations,
two above and two on end lobe.
Siz e . Diam. 45-50 g (W .) ; le n g th 110 g ; diam. 50 g (R .).
Ralfs. Desm. (1848), p. 82, t. 13, f. 3. Archer in P rit.
Inf. (1861), p. 729. Rahh. Alg. Enr. (1868), 182. Clove
Sver. Desm. (1864), 485. Lnndell Desm. Sueo. (1871), p.
19. Nordstedt Norges Desm. (1873), p. 8. P e tit Liste Desm.
Paris (1877), p. 31. Wood. P. Wate r Alg® U.S. (1872), p.
138. Brebisson Liste Desm. (1856), p. 122. Wolle Desm.
U.S. (1884), 100, t. 26, f. 11, 12. Jacobsen Desm. Denm.
(1874), p . 190.
H ab. Pools.
Westmoreland, Snssex, Hants, Wales, Scotland; Prance,
Sweden, Denmark, Norway, United States.
Plate X X X I I I ., fig. 2. a, living frond j I, empty fro n d ; c, side
view ; d, end view.
E u a s tz um am p u lla c e um . Palfs. Desm. (1848),g. 83, t. 13, f . 4.
Frond ra th e r more th an one-half longer th an broad, segments
obscurely three-lobed, short, with broad inflated base ;
basal lohes not emarginate, having on each upper side a
small intermediate tubercle between each and th e end lo b e ;
end lobe exserted and dilated, its notch linear. Empty frond
minutely punctate, inflations indistinct or confluent; tra n s verse
view with four inflations a t side and one a t each end.
S iz e . Diam. 62-75 g (W.) ; length 88-98 g ; diam. 67 g
(K.) ; length 90 g ; diam. 60 g (R.) ; length 104 g ; diam.
63 g (D.).
Ai’oher in P rit. Inf. (1861), p. 729. Delponte Desm.
(1876), p. 104, t. vi., f. 3, 4. Lnndell Desm. Snec. (1871),
p. 19. Kirch. Alg. Schles. p. 158. Nordstedt Norges Desm.
(1873), p. 8. Wood F. W a te r Alg® U.S. (1872), p. 138.
Wittrock Scan. Desm. (1869), p. 6. Brebisson Liste Desm.
(1856), p. 123. Rahh. Alg. Enr. (1868), p. 183. Wolle
Desm. U.S. (1884), 100, t. 28, f. 8-11.
Euastrum, Hassall Fr. Alg. (1845), t. 90, f. 11.
H ab. In ponds and pools.
Kent, Snssex, Hants, Westmoreland, W^'ales; France,
Norway, Sweden, Ita ly , United States.
Plate X X X I I I . , fig. 3. a, living frond ; h, empty fro n d ; c, side
view ; d, end view.
E u a s tz um in s ig n e . Sass. Alg. (1845), t. 9 1 ,/. 2.
Frond ra th e r more th an twice as long as broad ; segments
inflated a t b a se , sides entire, w i t h o u t la te ra l tubercles, and
tapering into a long slender neck ; end lobe dilated, its notch
linear. Empty frond minutely punctate ; semi-cells in front
view with two inflations a t th e base.
S iz e . Diam. 30-35 g (W .); length 100-107 g ; diam. 49-
61 g (K.) ; length 110 g; diam. 60 g (R.).
Ralfs. Desm. (1848), p. 83, t. 13, f. 6. Archer in P rit.
Inf. (1861), p. 729, t. 3, f. 12. Cleve Sver. Desm. (1864),
p. 484. Lnndell Desm. Snec. (1871), p. 21. Nordstedt
Norges Desm. (1873), p. 9. Wood F. Wate r Alg® U.S.
(1872), p. 139. Wittrook Scan. Desm. (1869), p. 6. Rahh.
Alg. Eur. (1868), p. 184 (sine var. ß .) . Kirchner Alg. Schles.
(1878), p. 158. Wolle Desm. U.S. (1884), p. 102, t. 27, f.
39-43.
H ab. Ponds and pools.
Hants, Westmoreland, Wales, Scotland; Germany, Sweden,
Norway, United States.
Plate XXXIIL, fig. 4. a, living frond; h e, 'empty fronds; d, side
view ; e, end view.
E u a stzum d id e lta . Palfs. A m . Nat. Nist. (1844), p . 190, t. 7,
/ . 2, a, I.
Frond ra th e r more th an twice as long as b ro a d ; segments
pyramidal, inflated a t the base and again a t th e middle ; end
scarcely dilated, rounded, its notch linear. Empty frond
punctate ; semi-cells in front view with several inflations in
lines, and two a t th e end in transverse view with four inflations
a t each side and one a t each end. Zygospore orbicular,
with subulate spines.
S iz e. Length 45-54 g; diam. 22-25 g (W.) ; length 110-
140 g ; diam. 60-70 g (K.) ; length 135 g ; diam. 65 g (R.) ;
len g th 144 g ; diam. 72 g (D.).
Ralfs. Desm. (1848), p. 84, t. 14, f. 1. Archer in Prit.
Inf. (1861), p. 729, t. 1, f. 23, 24, 25. Delponte Desm.
(1876), p. 105, t. vi., f. 2. Cleve Sver. Desm. (1864), p. 485.
Lnndell Desm. Sueo. (1871), p. 19. Nordstedt Norges
Desm. ^ 8 7 3 ), p. 9. Nordstedt Desm. Arct. (1875), p. 41.
Brebisson Liste Desm. (1856), p. 123. Wolle Desm. U.S.
(1884), p. 99, t. 29, f. 9, 10. Wood F. Wate r Alg® U.S.
(1872), p. 139. Notaris Desm. Ital. (1867), p. 35, t. 3, f.
13. Rahh. Alg. Enr. (1868), p. 184. Jacobsen Desm.
Denm. (1874), p. 190. Kirchner Alg. Schles. (1878), p. 157.
Heterocarpella didelta, Tnrp. Mem. (1828), p. 295.
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