Desmids from Thailand and Malaysia

38 M. HIRANO
bergen, Greenland.
90. C. pseudobroomei Wille Pl.21,f.9.
West 1911, 4, 22, Pl.100, f.7,8.
L 31-42.7 ptm, B. 31-35 ptm, and I. 9-11 ptm. St. 43. New to Thailand. Cosmo-
politan.
91. C. pseudoconnatum Nordst. var. pseudoconnatum Pl.13, f.4.
Krieger & Gerloff 1969, 3-4, 330, Pl.53, f.2; F6rster 1982, 243, Pl.19, f.4-5.
L. 42-61 ptm, B. 34-40 ym, and I. 32-37 #m. Cells very slightly constricted at
the middle, apex slightly convex, non-flattened. This species is distinguished from C.
connatum by the retuseness of sinus and is also distinguished from C. alpestre by the
small size of a cell. Sts. 1,51. Cosmopolitan. New to Thailand.
91a. var. attenuatum Fdrster
Krieger & Gerloff 1969, Gatt. Cosm. 3-4, 331, Pl.71, f.10.
L. 97 um, B. 48.5 ptm, and I. 47 ptm. St. 47. Brazil. New to Thailand.
91b. var. subconstrictum Jao
Krieger & Gerloff 1969, 3-4, 332, Pl.71, f.11.
L. 80 ym, B. 48.5 um, and I. 47 um. St. 10. China, Malaysia.
92. C. pseudocoronatum Turner
Turner 1892, K. Sv. Vet. Akad. Handl. 25, 58, Pl.8, f.45.
L. 46 ptm, B. 44 ptm, and I. 6.5 xtm. Cells of medium size, deeply constricted, sinus
narrowly linear; semicells subrectangular, apex straight, lateral margin convex and con-
vergent; cell wall with radial series of small granules within the margin, gradually dimi-
nished in number and irregularly distributed toward the center. St. 11. India. New to
Malaysia.
93. C. pseudoexiguum Racib. Pl.16, f.18.
West 1908, 3, 65, Pl.70, f.25,26; Scott & Prescott 1961, 66, Pl.32, f.8.
L. 17.6 "m, B. 10 ptm, and I. 3.S ptm. Sts. 36,40. Ceylon, Indonesia (Sumatra),
Japan, Europe. New to Thailand.
94. C. pseudoprotuberans Kirchn. var. pseudoprotuberans
West 1908, 3, 82, Pl.72, f.6-8; FOrster 1982, 246, Pl.20, f.12.
L. 22-31 ptm, B. 15.4-25.5 um, and I. 4.4-6.5 ptm. Sts. 25,49. India, Japan,
Europe, U.S.A., Africa. New to Thailand.
94a. var. kossinskajae Krieger&Gerloff Pl.18, f.18.
Krieger & Gerloff 1965, Gatt. Cosm. 2, 232, Pl.41, f.11.
L. 9.7 xtm, B. 8.8 ptm, and I. 3.5 um. Cells minute, a little longer than the breadth,
constriction not so deep, sinus open and acute; semicells reniform-subhexagonal, each
angle acute, apex straight, upper lateral margin shorter than the lower; vertical view of a
semicell elliptic with central inflation. St. 26. Japan, Europe, Alaska. New to Thailand.