Desmids from Thailand and Malaysia

24 M. HIRANO
7.
8.
9.
10.
11.
12.
13.
dia. New to Thailand.
C. armatum Joshua Pl.21, f.8.
Joshua 1886, Jour. Linn. Soc. Bot. 21, 646, Pl.24, f.21-25; Prescott et al. 1981, 2:3,
74, PL213, f.1.
L. 32-35 ym, B. 30-31 ptm, I. 8-9 um. Cells slightly longer than the breadth,
constriction deep and narrowly linear; semicells trapeziform, apex straight or very slight-
ly convex, apical angles with a denticulation, lateral margin convex and convergent with
3-4 denticulations almost equidistantly. This species differs from C. ceylanicum by the
number of marginal denticulations and a central marking of semicell. Sts. 23,24,39. Bur-
ma. New to Thailand.
C tzskenasyi Schmidle var. latum Scott&Prescott Pl.19, f.1.
Scott & Prescott 1961, Hydrobiol. 17, 54, Pl.23, f.5.
L. 145-154 ptm, B. 119-123 ptm, I. 48.5-53 gm. Sts. 10,25. Burma. New to Thai-
land.
C. atomus (Eckert) Krieger & Gerloff
Krieger & Gerloff 1965, 315, Pl.49, f.10.
L. 10 ptm, B. 10 um, I. 4.5 #m. Cells minute, isthmus linearly open, apex of semi-
cell straight and somewhat retuse at the middle part. St. 1. Europe. New to Thailand.
C. auriculatum Reinsch var. bogoriense Bernard Pl.17, f.10.
Bernard 1908, Dept. Agr. Indes Neerl. 116, Pl.7, f.181, 182; Krieger 1932, Arch.
Hydrobiol Suppl. 11, 170, Pl.11, f.18.
L. 48.5 "m, B. 48.5 ptm, and I. 26.5 ptm. St. 26. Indonesia (Java, Sumatra). New to
Thailand.
C. bengalense (Grun.) Turner Pl.15, f.3.
Turner 1892, K. Sv. Vet. Akad. Handl. 25, 56, Pl.8, f.33; FOrster 1982, 167, Pl.25,
f.7.
L. 77-79 ptm, B. 41-44 ptm, and I. 17.5 ptm. Sts. 49,51. India, Burma, Indonesia
(Java, Sumatra), Taiwan, Japan, Australia.
C. bimamillatum Krieger Pl.19, f.3.
Krieger 1932, 171, Pl.13, f.3: Prescott et al. 1981, 2:3, 80, Pl.246, f.6,9.
L. 35-36 ptm, B. 28.6-31 "m, and I. 8-9 ptm. Cells slightly longer than the
breadth, deeply constricted, sinus narrow and linear; semicells subrectangular, lateral
margin converging upward, apex straight; cell wall granulated, a pair of large granules
disposed below the apex, other granules small, disposed somewhat in radial series within
the margin, central granules somewhat large in size and disposed transversally. Sts.
10,28,51. N. & S.America, Africa. New to Thailand.
C. binerve Lund. PL18, f.2.
Krieger 1932, 171, Pl.10, f.1 (listed as a forms); Krieger & Gerloff 1969, 257, Pl.44,
f.1.