Wolle Desm. U.S. (1884), 40, t. 50, f. 26. Wittrock Scan.
Desm. (1869), p. 22. Brebisson Liste Desm. (1856), p. 150.
Notaris Desm. Ital. (1867), p. 59, t. 6, f. 61. Rabli. Alg. Eur.
(1868), p. 127. Wille Nov. Sem. (1879), p. 59. Jacobsen
Desm. Denm. (1874), p. 168. Klebs. Desm. Pruss. (1879), p. 6.
Vibrio lunula, Muller Natiirf. (1784), p. 142.
Bacillaria lunula, Sohrank Acta Nat. Cur. (1823), p. 533.
Mulleria lunula, Leclerc Mem. Mus. (1802).
, Lunulina vulgaris, Bory. Ency. (1824), t. 2.
H ab. In small ponds.
Sussex, Kent, Surrey, Cheshire, Westmoreland, Lancashire,
Norfolk, Cornwall, Wales, Scotland, Ireland; France, Germany,
Austria, Italy, Norway, Denmark, Sweden, Nova Zembla,
United States, Mexico.
Plate V I I I ., fig, 4. a, living c e ll; h, empty cell j c empty cell of
large form.
C lo s te x ium a c ex o sum . F ir . A lh . Berl. Akad. (1831).
Frond slender, six to fifteen times as long as broad, linear
lanceolate, gradually tapering, upper margin slightly convex,
the lower nearly straight, slightly inclined upwards at the
conical ends, large granules in a single central longitudinal
series ; fillets several, distinct ; empty frond colourless, very
faintly striated, central suture evident, zygospore orbicular,
smooth, placed between the dehiscing deciduous empty fronds.
S i z e . 0-15-0-42 mm. x 17-40 p (R.) ; 0-85-0-42 mm. x
22-50 p (A.). Diam. 85-62 p (W.)
Ehr. Inf. (1838), p. 92, t. 6, f. 1. Ralfs. Desm. (1848),
p. 164, t. 27, f. 2. Archer in Prit. Inf. (1861), p. 747.
Hassall Fr. Alg. (1845), p. 374. Delponte Desm. (1878), p.
97, t. 16, f. 4-13. Cleve Sver. Desm. (1864), p. 495. Lundell
Desm. Suec. (1871), p. 79. Nordstedt Norges Desm. (1873),
p. 41. Petit Liste Desm. Paris (1877), p. 28. Grunow
Desm. Austr. (1858), p. 497. Wood P . Water Alg® U.S.
(1872), p. 111. WDlle Desm. U.S. (1884), p. 41, t. 6, f. 7,
11, t. 8, f. 17. Wittrock Scan. Desm. (1869), p. 23. Brebisson
Liste Desm. (1856), p. 152. Notaris Desm. Ital.
(1867), p. 61, t. 8, f. 65. Rabh. Alg. Eur. (1868), p. 128.
Wille Nov. Sem. (1879), p. 60. Jacobsen Desm. Denm.
(1874), p. 169 (partly). Klebs. Desm. Pruss. (1879), p. 7
(var. a). Kirch. Schles. 188.
Vibrio acerosus, Sohrank Fauna Bois (1803), p. 47.
H ab. In small ponds and pools.
Sussex, Surrey, Cheshire, Westmoreland,Lancashire, Gloucester,
Cornwall, Wales, Scotland ; France, Germany, Italy, Norway,
Denmark, Sweden, Nova Zembla, United States, Mexico.
Plate IX ., fig. 1. a, living cell ; 5, empty cell; c, zygospore.
var. a c e ro s um .
Frond more elongated, stri® more distinct.
S i z e . 0'5-0'76mm. x 50 yu, (R.).
Clostexium. l a n c e o la tum . Kutz. Phyc. Germ. (1845), p. 130.
Frond six to ten times longer than broad, semilanceolate,
gradually tapering; upper margin convex, lower nearly straight,
inclined upwards towards the tapering subacute ends ; large
granules in a single central series, fillets several, distinct, empty
frond colourless, usually without markings, sometimes faintly
striate; central suture evident.
S i z e . 0'37 mm. x 55 p (R.). Diam. 50-55 p (W.).
Ralfs. Desm. (1848), p. 163, t. 28, f. 1. Archer in Prit. Inf.
(1861), p. 747. Cleve Sver. Desm. (1864), p. 495. Lundell
Desm. Suec. (1871), p. 79. Petit Liste Desm. Paris (1877),
p. 28. Grunow Desm. Austr. (1858), p. 497. Wittrock
Scan. Desm. (1869), p. 22. Brebisson Liste Desm. (1856), p.
152. Rabh. Alg. Eur. (1868), p. 129. Wolle Desm. U.S.
(1884), p. 89, t, 8, f. 14.
Cyutbella llophirkii, Moore Harv. Man. (1841), p. 215.
Closterium acerosum b. lanceolatum, Klebs. Desm. Pruss.
(1879), p. 7.
H ab. In pools.
Kent, Westmoreland, Ireland; France, Germany, Austria,
Sweden, United States.
Plate IX ., fig. 2. a, living cell j h, empty cell.
C lo s tex ium tu ig id u m . Fhr. In f. (1838), p. 95, t. 6, / . 7.
Frond stout, eight to twelve times as long as broad, semilanceolate,
slightly tapering, upper margin convex, with a
depression near each extremity ; lower margin concave, inclined
upwards, towards the rounded ends ; large granules in a
single longitudinal series, fillets several, empty frond reddish,
longitudinal stri® close, distinct, central suture evident.
Siz e . 0 ’62 mm. x 65 p (R.)-;- O'7-l mm. x 80 p (C.).
Diam. 64-75 p (W.).
Ralfs. Desm. (1848), p. 165, t. 27, f. 3. Archer in Prit. Inf.
(1861), p. 747, t. 3, f. 40. Hassall Fr. Alg. (1845), p. 371.
Lundell Desm. Suec, (1871), p. 79. Brebisson Liste Desm.
(1856), p. 150. Rabh. Alg. Eur. (1868), p. 129. Delponte
Desm. Ital. (1878), p. 113, t. 16, f. 24-29. Wolle Desm. U.S.
(1884), p. 41, t. 6, f. 15. Kiroh. Schles. 138.
Closterium turgidum, a. typicum, Klebs. Desm. Pruss. (1879),
p. 20.
H ab. In swamps.
.1
.•I,