Desmids from Thailand and Malaysia

Desmicts from Thailand and Malaysia 51
10. E. denticulatum (Kirchn.) Gay Pl.23, f.3; Pl.26, f.4.
West 1905, 2, 56, Pl.39, f.1-4; Krieger 1932, 212, Pl.20, f.14. (forma); Krieger 1937,
583, Pl.80, f.15-17; FOrster 1982, 318, Pl.41, f.5.
L. 32-35 ptm, B. 23-26.5 um, and I. 5.2-6.5 ptm. Sts. 1,22,29,30,43,44. Cosmopoli-
tan.
11. E. didelta Ralfs var. bengalicum Lagerh. Pl.23, f.21.
Krieger 1937, 519, Pl.67, f.4-6; Scott & Prescott 1961, 25, Pl.9, f.5,6; Hirano 1967,
Nature and Life Southeast Asia 5, 58, Pl.1, f.5.
L. 123-132 Ltm, B. 57-90 ptm, and I. 13-17 ptm. Cells fairly large, approximately
twice longer than the breadth; semicells 5-lobed, polar lobes elongated and somewhat
variable in shape, upper lateral lobes fairly developed, lower lateral lobes broadly
rounded; cell wall with 2 scrobiculations and disposed vertically. This variety resembles
E. sinuosum var. dideltoides. It is larger in size than the latter. Sts. 18,19,24,44,49. In-
dia, Ceylon, Indonesia (Java, Borneo, Sumatra), Singapore, Cambodia. New to Thai-
land.
12. Ediplostauron Skuja Pl.27,f.7.
Skuja 1949, Nova Acta R. Soc. Sci. Upsal. IV, 14:5, 112, Pl.24, f.1; Hirano 1977,
Illastr. Jap. Freshw. Algae 641, Pl.638, f.10 (in Japanese).
L. 24 ptm, B. 28 ptm, and I. 6 ptm. Cells small, approximately as long as the breadth
or a little broader than the length, deeply constricted, sinus open and broadly linear,
acute at the extremity; semicells with a straight apex and acute denticulations at the
apical angle, lateral lobes horizontal with 3 or 4 denticulations and similar denticulations
within the polar and lateral margins, 3 or 4 denticulations in the centre of the semicell
just above the isthmus. Sts. 19,20. Burma, Japan. New to Thailand.
13. E. dubium Nag. var. dubium Pl.26, f.2,3; Pl.28, f.5.
Krieger 1937, 13:1, 571, Pl.79, f.1-5; Ruzicka 1981, 1:2, 493, Pl.81, f.1-4; FOrster
1982, 320, Pl.41. f.1-2.
L. 26.5-39 ptm, B. 16.7-24 pm, and I. 5-9 ptm. Sts. 3,17,24,25,32,40,43,49. In-
donesia (Sumatra), Europe, U.S.A., Africa. New to Thailand.
13a. var. tropicum (W.&G.West) Krieger , Pl.27, f.6; Pl.30, f.5,6.
Krieger 1937, 573, Pl.79, f.28,29.
L. 23 pm, B. 14 ptm, and I. 5.3 ptm. Smaller in size than that of the var. dubium;
semicells somewhat pyramidal, 3-lobed, polar lobe rectangular, side lobes somewhat
produced, apex with a deep and somewhat linearly open incision, apical angles with a
denticulation; cell wall with a group of granules. St. 26. Ceylon, Africa. New to Thai-
land.
14. E. elegans (Breb.) KUtz. var. elegans Pl.26, f.10,11; Pl.30, f.1.
Krieger 1937, 591, Pl.81, f.14-18; Scott & Prescott 1961, 26, Pl.13, f.17; FOrster
1982, 321, Pl.42, f.1-2.
L. 21-31 ,um, B. 13-20.5 ptm, and I. 4.5-5.3 ptm. Sts. 20,24,47. Burma, Indonesia