Desmids from Thailand and Malaysia

Scott & Prescott 1961, 56, Pl.31, f.5.
Desmids from Thailand and Malaysia 27
L. 28.6 ptm, B. 25.5 ptm, and I. 7.5 xtm. Cells of medium size, 1.5 times longer than
the breadth, constriction deep and sinus narrowly linear; semicells trapeziform, apex
straight, lateral margin convex-undulate, granules equidistantly disposed; ceil wall with 4
large granules just below the apex, a group of scrobiculations disposed in the central
part of a semicell; side view of semicell circular, apex almost straight. St.
32,36,37,40,41,51. Indonesia (Java, Sumatra). New to Thailand.
24. C circulare Reinsch var. circulare
West 1905, 2, 136, Pl.61, f.11,13-14; F6rster 1982, 179, Pl.21, f.1.
L. 44 ptm, B. 54 ptm, and I. 16 #m. St. 39. Ceylon, Japan, Europe, Africa. New to
Thailand.
24a. var. messikommeri Krieger & Gerloff
Krieger & Gerloff 1962, Gatt. Cosm. 1, 2, Pl.1, f.3.
I-.. 44 ptm, B. 36.5 ptm, and I. 15.4 Ltm. Cells sHghtly longer than those of typical
form; semicells perfectly semicircular. St. 19. Europe. New to Thailand.
25. C clepsydra Nordst. var. dissimile Krieger&Gerloff Pl.18, f.8.
Krieger & Gerloff 1962, Gatt. Cosm. 1, 145, Pl.30, f.9.
L. 23 ptm, B. 22 ptm, and I. 6.5 ptm. St. 50. Europe, Brazil, Africa. New to Thailand.
25a. var. truncatum Gutw. Pl.18, f.5.
Krieger & Gerloff 1962, 147, Pl.30, f.16.
L. 19.5 #m, B. 18 #m, and I. 4.4 ptm. St. 47. Europe. New to Thailand.
26. C. connatum Breb. Pl.16, f.23.
West 1908, 3, 25, Pl.67, f.15-17; Krieger 1932, 173, Pl.8, f.14,15; Krieger & Gerloff
1969, 327, Pl.52, f.1.
L. 73.5 ptm, B. 57 ptm, and I. 52 ptm. Sts. 10,12,32. India, Burma, Singapore, In-
donesia (Sumatra), Japan, Europe, U.S.A., Africa.
27. C. contractum Kirchn. var. contractum Pl.13, f.10; Pl.14, f.4.
West 1905, 2, 170, Pl.61, f.23-25; Krieger 1932, 173, Pl.9, f.1; F6rster 1982, 184,
PL 19, f. 15 - 17.
L. 31-44 xtm, B. 19-31 ptm, and I. 4.5-7.5 "m. Sts. 1,10,32,47,53. Indonesia (Java,
Sumatra), India, Ceylon, Burma, Europe, U.S.A., Chile (Patagonia), Africa, Madagas-
car.
27a. var. eltipsoideum (Elfv.) W. & G.S.West
West 1905, 2, 172, Pl.61, f.28,35; F6rster 1982, 185, Pl.19, f.19.
L. 28-50 ptm, B. 20-35 ptm, and I. 5.3-8 ptm. Sts. 26,36,37,44. Cosmopolitan.
27b. var. indentatum (GrOnblad) Krieger&Gerloff Pl.15, f.5.
Krieger & Gerloff 1962, 74, Pl.17, f.6.
L. 46 #m, B. 31 um, and I. 7.5 ptm. Central part of semicell thickened brown in
colour, sinus more opened than that of the typical form, broadly rounded at the extrem-