Desmids from Thailand and Malaysia

42 M. HIRANO
West 1908, 3, 157, Pl.79, f.1,2; Pl.82, f.15.
L. 35 #m, B. 35 Ltm, I. 10.5 um. Semicells reniform, apex faintly flattened, lateral
margin convergins upward, apical angles broadly rounded; cell wall granulate, granules
somewhat vertically disposed. The specimens examined are slightly smaller than the In-
donesian forms described by Krieger & Gerloff. St. 43. Cosmopolitan.
110. C. repandum Nordst. var. mintts (W. & G.S.West) Krieger & Gerloff
Krieger & Gerloff 1965, Gatt. Cosm. 2, 234, Pl.41, f.18.
L. 15.4 ptm, B. 13 ptm, I. 3 ptm. St. 2. China, Japan, Europe, N. & S.America, Afri-
ca. New to Thailand.
111. C. retusiforme (Wille) Gutw. var. retttsiforme Pl.17, f.19.
Scott & Prescott 1961, 68, Pl.32, f.15.
L. 20.7 ptm, B. 13 ptm, I. 4.4 ptm. St. 16. Indonesia (Java). New to Thailand.
111a. var. incrassatum Gutw.
Prescott et al. 1981, 2:3, 279, Pl.219, f.12,15.
L. 66 ptm, B. 42 xtm, I. 19 ptm. Cells subhexagonal, deeply constricted, sinus nar-
row, lateral margin of semicell slightly convex and rounded, upper lateral margin longer
than the lower and non-retuse, lower margin rounded, apex narrow and slightly round-
ed. The specimens examined are similar to C. pseudorectangulare. However the lower
lateral margin of this var. incrtzssatum is longer than that of the latter with a short con-
vex lateral margin. Skuja repoted this variety from Burma. St. 3. Europe, N. &
S.America.
112. C. scabrum Turner Pl.19, f.5.
Turner 1892, K.Sv.Vet.Akad.Handl. 25, 90, Pl.9, f.32; Scott & Prescott 1961, 68,
Pl.29, f.3.
L. 50.6 Ltm, B. 53 "m, I. 11 ptm.' St. 25. India, Indonesia (Sumatra). New to Thai-
land.
113. C. sexangulare Lund. var. sexangulare Pl.16, f.3.
West 1908, 3, 81, Pl.72, f.3; Krieger & Gerloff 1965, Gatt. Cosm.2, 239, Pl.42, f.10.
L 35-39.6 ym, B. 28-29 um, I. 9 ptm. Sts. 2,10,26,51. Cosmopolitan.
113a. var. minus Roy&Bisset Pl.17, f.20.
Roy & Bisset 1886, Jour. Bot. 24, 195; Krieger & Gerloff 1965, 2, 240, Pl.42, f.12;
Prescott et al. 1981, 2:3, 284, Pl.220, f.9,10.
L. 8 ptm, B. 5.7-8 xtm, I. 2.2 ptm. Sts. 23,50. Indonesia (Java, Sumatra, Celebes),
Japan, Europe, N.America, Africa, New Zealand. New to Thailand.
113b. var. rotundatum Grdnblad Pl.18, f.16.
Krieger & Gerloff 1969, Gatt. Cosm. 3-4, 241, Pl.42, f.13.
L. 23.3 "m, B. 15.8 ptm, I. 13 ptm. Semicells octagonal, each angle obtuse, apex
straight. St. 47. Europe. New to Thailand.
114. C. speciosum Lund. var. simplex Nordst. Pl.21, f.12.