Desmids from Thailand and Malaysia

30 M. HIRANO
41.
42.
pseudopyramidatum var. abruptum Krieger & Gerloff. It is however different from the
latter by the small size and elongated form. Sts. 3,40. N. America. New to Thailand.
C. 'dubium Borge PL13, f.8; PL17, f.11.
Scott & Prescott 1961, 58, Pl.32, f.3.
L. 27.5-28 ptm, B. 18.5-20 ptm, and I. 4.5-6.5 ptm. Cells 1.5 tirries longer than
the breadth; semicells truncate-pyramidate, lateral margin undulate, undulations 3 in
number, apex retuse; vertical view of a semicell long elliptic with a papilla on each side.
Sts. 21,23, Indonesia (Borneo, Java, Sumatra). New to Thailand.
C. exasperatum Joshua var. spinatum Scott & Prescott
Scott & Prescott 1961, Hydrobiol. 17, 58, Pl.31, f.11.
L. 35-36 "m, B. 37-40 "m, I'. 9-12 #m. Sts. 1,39,40,41. Indonesia. New to Thai-
land.
43. C. exiguum Arch. var. exiguum
West 1908, 3, 63, Pl.70, f.17-19; F6rster 1982, 202, Pl.22, f.19.
L. 20 Ltm, B. 12 um, I. 5.3 um. St. 18. Cosmopolitan.
43a. f. ocellatum Gr6nblad & Croasd.
Krieger & Gerloff 1969, Gatt. Cosm. 3-4, 272, Pl.45, f.7.
L. 17.6 xtm, B. 5.5 pm, I. 7.5 gm. St. 36. Africa. New to Thailand.
44. CfuelleborneiSchmidle
Krieger & Gerloff 1969, Gatt. Cosm. 3-4, 334, Pl.54, f.3.
L. 59.4 ptm, B. 35 ptm, I. 11 ptm. St. 19. Africa, Brazil. New to Thailand.
45. C. garrolense Roy & Bisset var. pyramidatum Krieger & Gerloff
Krieger & Gerloff 1962, Gatt. Cosm. 1, 44, Pl.12, f.3.
L. 25.5 um, B. 22 ptm, I. 6.5 #m.
al margin undulate (undulations 5 in number). This variety differs from undutatum C.
var. minutum by the slightly convexed form.
10. Indonesia (Java, Sumatra). New to Thailand.
46. C. granatum Br6b. var. granatum Pl.16, f.20;
West 1905, 2, 186, Pl.63, f.1-3; Fdrster 1982, 205, Pl.22, f.5-7.
L 35-39 xtm, B. 22-26.5 ptm, I. 4.5-6.5 ptm. Sts. 11,12,20,26,32,50,51.
tan.
46a. var. rotundatum Krieger
47.
Krieger 1932, Arch. Hydrobiol. Suppl.11, 177, Pl.10, f.21.
L. 33 ptm, B. 22 #m, I. 6.5 ptm. St. 18. Indonesia (Borneo, Sumatra).
Iand.
Semicells semicircular, apex slightly convex, later-
Moreover the latter has a undulations. St.
C. hammeri Reinsch var. protuberans W. & G.S.West Pl.15, f.16.
W. & G.S.West 1905, 2, 183, Pl.62, f.24,25; Krieger & Gerloff 1962, 104, Pl.21, f.13.
L. 30 ptm, B. 18 ptm, I. 6.5 ptm. Sts. 16,28. Cosmopoiitan.
Pl.17, f.16.
PL 18, f.9.
Pl.17, f. 15.
Cosmopoli-
New to Thai-