ends truncate, reddish, large granules in a single series,
empty frond reddish, especially near the ends, stri® faint,
central sutnre evident, sometimes accompanied by two others
dividing th e frond into four portions.
S iz e . Length 0'37 m m .; breadth 30 a (R.). Diam.
30-32 (W.).
Ralfs. Desm. (1848), p. 169, t. 28, f. 7. Wolle Desm. U.S.
(1884), 39, t. 8, f. 12, 13. Archer in P rit. Inf. (1861), p.
746, t. 3, f. 39. Delponte Desm. (1876), p. 104, t. xvii., f.
31-37. Cleve Sver. Desm. (1864), p. 494. Lundell Desm.
Sueo. (1871), p. 77. Nordstedt Norges Desm. (1873), p.
39. P e tit Liste Desm. Pa ris (1877), p. 28. Wittrock
Scan. Desm. (1869), p. 22. Brebisson Liste Desm. (1856),
3.151. Rahh. Alg. Eur. (1868), p. 123. Jacobsen Desm.
Denm. (1874), p, 175. Kiroh. Schles. 138.
Olosterium subrectum, Breb. Alg. Pal. (1835), p. 59, t. 8.
Kutz. Phy. Germ. (1845), p. 131.
Olosterium turgidum B didymotocum, Klebs. Desm. Pruss.
(1879), p. 20.
H ab. In ponds.
Great B rita in ; Prance, Germany, Sweden, Norway, Denmark,
Italy, United States.
Flate V I I I ., Jig. 2. a, living cells ; b c, empty cells; d, end of empty
cell.
var. a. Ralfs. Desm. (1848),^. 1G9, t. 28, / . 7, a b.
Frond with three transverse sutures.
S iz e . 0'52-0-65 mm. x 50-70 p (0 .).
H ab. I n pools.
Wales.
var. $ . B a ile y a n um . Sreb.
Frond with one transverse suture.
S iz e. 0’38 mm. x 30 p (0 .).
Olosterium didymotocum, var. fj Baileyanum, Breb. in Ralfs.
Desm. (1848), p. 169, t. 28, f. 7, c d. Rabb. Alg. Eur. (1868)
p. 123.
Olosterium Baileyanum, Brebisson Liste Desm. (1856),
p. 151.
H ab. In ponds, &c.
Sussex, Surrey, Hants, Westmoreland, Cornwall, Wales,
Scotland; France.
Plate V I I I ., fig. 2. c, living cells; e, empty cells.
C lo s te iium d ix e c tum . Archer Micr. Journ. (1862), ii., 1.1 2 ,/. 23-24.
Frond ra th e r slender, about fifteen to tw en ty times longer
th an broad, scarcely curved, nearly straig h t, linear, ends
truncate; fillets indistinct; empty frond very finely and
closely striate.
S ize. 0-28-0-45 mm. X 18 ^ (A.).
Lundell Desm. Suec. (1871), p. 78. Nordstedt Norges
Desm. (1873), p. 41. P e tit Liste Desm. P a n s (1877), p. 2».
Rabh. Alg. Eur. (1868), p. 127.
Glosterium striolaturriy var. a Ulfiaj Jacobsen Desm. Denm.
(1874), p. 176.
Olosterium intermedium b. directum, Klebs. Desm. Pruss.
(1879), p. 16.
H ab. In mountain pools.
Ireland; France, Germany, Sweden, Norway, Denmark.
Plate V I I I ., fig. 3. a, living cell; b c, empty cells.
C lo s tex ium o b tu s um . Breh. L iste ,p . 154, t. 2, / . 46.
Frond minute, 4 to 10 times as long as broad, nearly
straight, cylindrical, not tapering, upper and lower margin
equally and very sliglitly curved, ends obtusely ro u n d ed ;
large grannies in a single series, empty frond smooth.
S iz e. 0.15 mm. X 18 ;ii (C.). Diam. 5'11 y (W.) ; 50 p x
Archer Micr. Journ. (1876), xvi., p. 338. Pritch. Inf. 746.
Lundell Desm. Suec. (1871), p. 77. Klehs. Desm. Pruss.
(1879), p. 8. Wolle Desm. U.S. (1884), 38, t. 6, f. 1.
Ireland; Sweden, Germany, France, United States.
Plate X ., fig. i . a 5, living cells.
** Frond tapering, curvature slight, hwer margin nearly
straight, slightly inclined upwards, ends rounded or sub-acute.
C lo s te x ium lu n u l a . Dhr. Sym. Phy s. (1828), t. 2.
Frond large, stout, five or six times as long as broad, sernilu-
iiate, upper margin very convex, lower nearly straight, somewhat
inclined upwards towards the obtuse broadly rounded ends, endochrome
with the large granules numerous, scattered, fillets
several, distinct, empty frond colourless, without markings,
central suture not evident.
S iz e . 0'55 mm. x 90 p (0 .) ; 0’4 mm. x 76 p (R-)-
Diam. 80-110 p (W).
Ehr. Infus., p. 90, t. 5, f. 15. Ralfs. Desm. (1848), p. 163,
t. 27, f. 1. Fooke Phys. Stud. (1847), t. 3, f. 18. Archer m
Prit. Inf. (1861), p. 747. Corda Aim. Carls. (1835), p. 190,
t. 5, f. 56, 57. Delponte Desm. (1878), p. 95, t. 16, f. 1-3.
Cleve Sver. Desm. (1864), p. 494. Lundell Desm. Siiec.
(1871), p. 79. Nordstedt Norges Desm. (1873), p. 41. Petit
Liste Desm. Paris (1877), p. 28. Grunow Desm. Austr.
(1858), p. 497. Wood F. Water Alg® U.S. (1872), p. I l l -
■, (
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