Desmids from Thailand and Malaysia

an M. HIRANO
Pl.46, f.7; Pl.47, f.1.
L. 46-79 ym, B. 26-44 ptm, and I. 13-16 #m. St. 41. Cosmopolitan.
122. C. subgranatum (Nordst.) LUtkem. var. borgei Krieger & Gerloff
Krieger & Gerloff 1965, Gatt. Cosm. 2, 139, Pl.29, f.11.
L. 21 ptm, B. 13 ptm, and I. 4.4 um. Europe. New to Thailand. St. 26.
123. C. subprotumidumNordst.
West 1908, 3, 231, Pl.86, f.19-21; FOrster 1982, 274, Pl.37, f.11.
L. 29 ptm, B. 26.4 ptm, and I. 7 gm. Cells of submedium size,
tion, sinus narrowly linear; semicells trapeziform, truncate apex,
row, intramarginal granules disposed in a pair but diminishing toward
the vertical series of granules disposed in the centre above the isthmus. St.
(Sumatra), Nepal, China, Japan, Europe. New to Thailand.
124. C subspeciosum Nordst.
West 1908, 3, 252, Pl.89, f.11; FOrster 1982, 276, Pl.38, f.2.
L. 44 um, B. 33 ptm, and I. 11 ptm. Cells of medium size,
breadth, sinus deep and narrowly linear; semicells crenate-trapeziform,
nae, lateral margin convex and with 5 crenae, each emarginate crenae lik
central part of a semicell with a vertical series of costae (5-costae). St.
N.America, Africa.
125. C. subtumidum Nordst. var. subtumidum
West 1905, 2, 192, Pl.63, f.18-20; Krieger & Gerloff 1965, Gatt. Cosm. 2,
f.17.
L. 27-29 ptm, B. 23-28.5 ptm, and I. 8.5 ptm. Sts. 1,40.
stralia.
125a. var. rotundum Hirano
Hirano 1951, Acta Phytotax. Geobot. 14, 70, f.2; Prescott et al. 1981, 2:3
Pl.187, f.11,12.
L. 26.4 "m, B. 16 ptm, and I. 5.3 ptm. St. 40. Japan. New to Thailand.
126. C. sumatranum Krieger var. sumatranum
Krieger 1932, Arch. Hydrobiol. Suppl. 11, 188, Pl.11, f.2.
L. 31 ptm, B. 26.5 ptm, and I. 8 um. Cells of medium size, deeply constricted, sinus
narrowly linear but a little acutely dilated in some specimens; semicells trapeziform,
apex straight or faintly retuse, lateral margins convex and convergent, apical angles
broadly rounded; cell wall furnished with sparcely and radial series of small granules,
series diminished in the inner series, centre smooth. St. 45. Indonesia (Java, Sumatra).
New to Thailand.
126a. var. nepalense F6rster Pl.21, f.11.
FOrstet 1982, 279, Pl.30, f.11,12.
L. 17.6-22 ptm, B. 13-17.6 ptm, I. 6-6.5 ptm. Cells small, as long as the breadth,
PL18, f.21.
with a deep constric-
apical undulation shar-
the centre, with
11. Indonesia
1.3 times longer than the
apex with 4 cre-
e a binate from
53. Asia, Europe,
Pl.14, f.9.
162, Pl.33,
Europe, Brazil, Africa, Au-
, 316,