14 ZVaoPHYOE^.
D o c id ium E h z e n b e i'g ii. Ralfs. Desm. (1848), i?. 157, t. 2 6 ,/. 4.
Segments many times longer th an broad, having two or
three slight inflations a t th e base, and truncate ends, bordered
by minute tubercles.
S ize. 180-450 x 25-35 p (W.) ; 0'62-0'74 mm. x 36 (D .);
180-450x25-35 p (K.).
Brebisson Liste Desm. (1856), p. 147. Arcber in P rit.
Inf. (1861), p. 745, t. 2, f. 8 and 11; t. 3, f. 46, 47. Grunow
Desm. Austr. (1858), p. 497. Jacobsen Desm. Denm. (1874),
p. 179.
Olosterium trabecula, Ebr. Abh. Berl. Ak. (1830), p. 62.
Ebr. Infus. p. 93, t. 6, f. 2.
Pleurotaenium JUhrenbergii, De Bary Oonj. (1858), p. 75.
Delponte Desm. p. 132, t. 20, f. 1-7. Nordstedt Norges
Desm. (1873), p. 46.
Docidium trabecula, Wolle Desm. U.S. (1884), 48, t. 9, figs.
2, 3, 4, t. 11, f. 1-7. Kiroli. Alg. Schles. (1878), 144.
Reinsoh. Alg. Frank, p. 182. Wittrock Scan. Desm. (1869),
p. 21. Jacobsen Desm. Denm. (1874), p. 178.
Pleurotaenium trabecula. Nag. Einz. Alg. (1849), p. 104.
Rabh. Alg. Eur. (1868), p. 141. Wood E. W a te r Alg® U.S.
(1872), p. 118. Wille Nov. Sem. (1879), p. 37.
H ab. In pools.
Sussex, Hants, Westmoreland, Gloucester, Middlesex,
Cornwall, Wales, S co tlan d ; France, Germany, Italy,
Norway, Denmark, United States, Nova Zembla.
Plate V I., fig. 1. a, living cell ; I, empty c e ll; d, zygospore.
var. B g x a n u la tum . Ralfs. Desm. p. 157, t. 3 3 ,/. 4.
Frond rough, with minute granules.
P e tit Liste Desm. Paris (1877), p. 29.
Pleurotcenium trabecula, var. b. granulatum, R abh. Alg. Eur.
(1868), p. 141.
H ab. In pools.
Sussex, Cornwall.
Flate V I., fig. 1. c, empty cell.
D o c id ium c l a v a tu m . Kutz. in R alfs. Desm. ( l8 iS ),p . 156, if. 26,
/ .3 .
Segments m an y tim es lo nger th a n b ro ad w ith a single in flation
a t th e base ; end clavate, b u t tru n c a te a t th e apex.
S ize. Diam. 23-25 p and 36-42 p (W .).
Archer in P rit. Inf. (1861), p. 745, t. 2, f. 9. Brebisson
Liste Desm. (1856), p. 147. Notaris Desm. Ita l. (1867), p.
57, t. 5, _f. 56. Wolle Desm. U.S. (1884), p. 48, t. 9, f. 8.
Closterium truncatum, Kutz. Phy. Germ. (1845), p. 133.
Pleurotcenium clavatum, D. By. Conj. (1858), p. 75. Lundell
Desm. Sueo. (1871), p. 89.
Pleurotcenium clavatum, Wood E. W a te r Alg® U.S. (1872),
p. 120. Rabh. Alg. Eur. (1868), p. 141.
H ab. In ponds.
Sussex ; France, Germany, Sweden, Italy, United States.
Plate VI., fig. 2. a, living cell ; I, empty cell.
D o c id ium n o d u lo sum , Breh. in Ralfis. Desm. (1848), p. 155, t. 26,
f . l .
Frond stout ; segments four to six times longer th an broad,
constricted a t regular intervals so as to produce undulated
margins ; suture projecting on each side.
S iz e. Diam. 40-60 p (W.) ; 0-24-0-66 mm. x 58 p (D.) ;
40-60,/t diam. (K.).
Brebisson Liste Desm. (1856), p. 147. Arcber in P rit.
Inf. (1861), p. 745. P e tit Liste Desm. Paris (1877), p. 29.
Wittrook Scan. Desm. (1869), p. 20. Notaris Desm. Ital.
(1867), p . 66, t, 6, f. 44, 45.
Pleurotcenium crenulatum, Yisdoh.. Alg. Eur. (1868), p. 142.
Docidium crenulatum (Ehr.), Wolle. Desm. U.S. (1884), p.
47, t. 9, f. 1.
Olosterium trabecula, Bailey Amer. Jouru. (1841), p. 302, t.
1, f. 32.
Olosterium crenulatum, Ehr. Verb. (1843), p. 123, t. 4, f.
29.P
leurotcenium nodulosum, D. By. Conj. (1858), p. 76. Delponte
Desm. (1878), t. 19, f. 1-6. Lundell Desm. Sueo.
(1871), p. 90. Kirch. Alg. Schles. (1878), p. 144. Cleve
Sver. Desm. (1864), p. 493.
H ab. In pools.
Gloster, Sussex, Hants, Westmoreland, Wales, Scotland ;
France, Germany, Italy, Sweden, United States.
Plate VI., fig. 3. a, living cell; I, empty cell.
D o c id ium tz u n c a tu m . Breb. in Ralfs. Desm. (1848), j). 156, i. 26,
/-2 -
Frond stout; segments three or four times longer th an
broad, with a single inflation a t th e base, tapering to the
truncate entire ends, suture projecting on each side.
S iz e . Diam. 50-75 p (W.) ; 0'41-0-65 mm. x 43-72 p
Archer in P rit. Inf. (1861), p. 745. P e tit Liste Desm.
Paris (1877J,p. 29. Brebisson Liste Desm. (1856), p. 147.
Jacobsen Desm. Denm. (1874), p. 178. Wolle Desm. U.S.
(1884), p . 48, t. 9, f. 6, 7.