Desmids from Thailand and Malaysia

34 M. HIRANO
L. 22-35 ptm, B. 13-20 um, I. 7-11 ptm. Sts. 25,32. Indonesia (Sumatra), Austra-
lia. New to Thailand.
63d. var. pandriforme (Heimerl) Schmidle Pl.16, f.6; Pl.17, f.12.
West 1908, 3, 22, Pl.67, f.8,9; Krieger & Gerloff 1969, 340, Pl.51, f.5.
64.
65.
66.
67.
68.
69.
70.
L. 33 um, B. 19 gm, I. 13 #m. Sts. 19,31,32. Europe, Australia. New to Thailand.
C minimum W. & G.S.West var. subrotundatum W. & G.S.West
West 1895, Trans. Linn. Soc. ser.2, 5:2, 59, Pl.8,f.11; Prescott et al. 1981, 189, Pl.206,
f.8.
L. 11 ptm, B. 9.7 ptm, I. 6.5 um. Cells minute, subrectangular, noN deep, sinus
open, apex of a semicell straight, apical angles obtuse, lateral margin slightly conver-
gent. St. 8. U.S.A. New to Thailand.
C. monomazum Lund. var. dimazum Krieger Pl.19, f.4.
Krieger 1932, 180, Pl.11, f.19.
L. 33-35 um, B. 31-35 um, I. 11-12.3 ptm. Sts. 19,51. Indonesia (Sumatra), Afri-
ca, S.America. New to Thailand.
C. nitidulum DeNot. var. javanicum Krieger & Gerloff Pl.18, f.7; PL26, f.17.
Krieger & Gerloff 1965, 164, Pl.34, f.6; Prescott et al. 1981, 2:3, 198, Pl.189, f.5,6.
L. 15 ptm, B. 12 ptm, I. 4.5 ptm. Sts. 32,47. Indonesia (Java), U.S.A. New to Thai-
land.
C. norimbergense Reinsch f. depressum W. & G.S.West Pl.15, f.17.
West 1908, 3, 53, Pl.69, f.28,29; Scott & Prescott 1961, 63, Pl.32, f.6,7.
L. 14-17.5 ptm, B. 13-155 ptm, I. 4.5 ptm. Sts. 43,51,53. Cosmopolitan.
Cnudum (Turner) Gutw. PL14, f.7.
Krieger & Gerloff 1962, 34, Pl.9, f.13; Pl.10,f.3; Prescott et al. 1981, 2:3, 202, Pl.158,
f.2.
L. 50.6 ptm, B. 52.3 Ltm, I. 13 ptm. Cells approximately as long as the breadth or a
little longer, deeply constricted, sinus deep and closed, the inner half part narrow-linear,
and the outer part slightly open; semicells semicircular, basal angles slightly produced
downward and thickend, apex scarcely straight. This species is similar to C. taxichon-
driforme. However the basal part of a semicell of the former distinctly thickened. St.
23. Asia, Europe, U.S.A. New to Thailand.
C obliquum Nordst. var. tatrica (Gutw.) Krieger & Gerloff Pl.26, f.16.
Krieger & Gerloff 1969, Gatt. Cosm. 3-4, 299, Pl.48, f.15.
L. 20 ,um, B. 16 Lim, I. 12 pt m. Sts. 3,8. Japan, Europe. New to Thailand.
C. obsoletum (Hantz.) Reinsch var. obsoletum Pl.15, f.11.
West 1905, 2, 33, Pl.56, f.1-3; Krieger & Gerloff 1962, Gatt. Cosm. 1, 7, Pl.3, f.1.
L. 35-42 xtm, B. 40-48 xtm, I. 13-15 ptm. Sts. 1,25,28,29,36,40,41,43,49. Japan,
Europe, N. & S.America, Africa, Australia.