Desmids from Thailand and Malaysia

31.
32.
33.
34.
35.
Desmicts from Thailand and Malaysia 55
gin slightly retuse in the upper part, basal angles rounded; cell wall smooth and without
a middle pore. The shape of semicell of this species is similar to that of C. pseudopyra-
midatum var. abruptum Krieger & Gerloff and C. urceum West. However, E. Iuetke-
muelleri differs from these two forms in having a broader cell. Sts. 35,36,46, Indonesia
(Borneo, Sumatra), Europe, Africa. New to Thailand.
E. obesum Joshua Pl.23, f.7,8,12.
West 1905, 2, 29, Pl.36, f.16,17; Krieger 1937, 495, Pl.59, f.9,10; Croasdale & Flint
1986, Fl. New Zeal. Desm.vol.1, 95, Pl.17, f.7,8.
L. 40-79 ptm, B. 24-37 ptm, and I. 7.5-11 ptm. New Zealand. New to Thailand.
E. politum Krieger Pl.26, f.6.
Krieger 1937, 482, Pl.57, f.2,3; Scott, Gr6nblad, Croasdale 1965, Act. Bot. Fenn.
69,34, f.43.
L. 33 ptm, B. 17.5 xtm, and I. 8. xtm. The specimens examined from Thailand are
smaller in size than that of the form described and reported by European authors. The
outline of a cell of my material is coincident with the typical form. St. 39. Brazil. New
to Thailand.
E. praemorsum (Nordst.) Schmidle Pl.25, f.6.
Krieger 1937, 13:1, 621, Pl.88, f.18-20; Fdrster 1982, 337, Pl.42, f.9,10.
L. 53-55 ptm, B. 33-37.5 ptm, and I. 6.5-9.5 ptm. Cells of medium size, deeply
constricted at the middle, sinus narrowly linear, 5-lobed; semicells truncate-pyramidate,
incision between the polar and lateral lobes subrectangular and rounded at the extrem-
ity, polar lobe obtrapeziform, side ones slightly diverging, apex convex and with an
acutely open incision, angles with a stout spine, lateral those of the lower, end of lateral
lobules emarginate or with 3 denticulations; cell wall with a pair of scrobiculations and a
pair of warts just above the scrobiculation, some warts disposed within the lateral
lobules. Sts. 1,36. Indonesia (Sumatra), Australia, New Zealand. New to Thailand.
E. pseudocoralloides Fritsch Pl.23, f.9; Pl.24, f.7.
Fritsch 1918, Annals South African Mus. 9, 549, textf. 25; Prescott et al. 1977, 2:2,
98, Pl.74, f.25.
L. 19.5-23 um, B. 15.5-17.6 ptm, and I. 4.5-5 ptm. Cells small, approximately 1.3
times longer than the breadth, deeply constricted at the middle, sinus narrowly linear;
semicells subquadrate, polar lobe rectangular, apex straight with a deep and open inci-
sion, apical angles with a short divergent spine, lateral lobes rectangular, lateral margin
retuse, basal and lateral angles acute, incision between polar and lateral lobes rectangu-
larly rounded; cell wall smooth. Sts. 26,30,44. U.S.A., S.Africa. New to Thailand.
E. serratum Joshua Pl.26, f.8.
Joshua 1886, Jour. Linn. Soc. Bot. 21, 639, Pl.23, f.1,2; Scott & Prescott, 1961, 17,
39, Pl.11, f.6,7; Hirano 1967, 5, 60, Pl.13, f.2.
L. 48.5 ptm, B. 31 xim, and I. 6.5 #m. Cells of medium size, approximately 1.6
times longer than the breadth, deeply constricted at the middle, sinus narrowly linear;