Desmids from Thailand and Malaysia

54 M. HIRANO
25.
26.
27.
28.
29.
30.
sinus open acutely and acuminate at the extremity; semicells 3-lobed, polar and lateral
lobes well rounded, incision between polar and lateral lobes broadly concave; cell wall
with a pore at the middle of a semicell, other parts punctated. L. 70.5-83 ptm, B. 37.5
39.6 ptm, and I. 11-13 "m. St. 42. Thailand.
E. invaginatum Scott&Prescott Pl.26, f.5.
Prescott et al. 1977, 2:2, 75, Pl.73, f.13,13b.
L 39.6 ptm, B. 19 ptm, and I. 10 ptm. St. 39. U.S.A. New to Thailand.
E. irregulare Maskell Pl.23, f.6; Pl.27, f.11.
Croasdale & Flint 1986, Fl. New Zealand Desm. 1, 93, Pl.21, f.5.
L. 26.4-28.6 "m. B. 22 ptm, and I. 6.5 ptm. Semicells trapeziform, 5-lobed, polar
lobe transversely rectangular, apex convex with a median notch, apical angles with a
short spine, incision between the polar and lateral lobes shallow concave, upper lateral
lobe truncate, lower lobe slightly developed 3-undulation. Sts. 30,36,39,40,41. New Zea-
land. New to Thailand.
E. ienneri Arch. PL22, f.8; PL24, f.4.
West 1905, 2, 22, Pl.36, f.4; Krieger 1937, 505, Pl.63, f.8; Ruzicka 1:2, 1981, 426,
Pl.69, f.13.
L. 63-84 xtm, B. 35-48 ptm, and I. 9-13 ptm. Cells of medium size, approximately
1.5-1.7 times longer than the breadth, deeply constricted at the middle, sinus closed;
semicells 5-lobed, polar lobe elongated and dilated upward like an anvil at the extrem-
ity, lateral lobe rectangular and divided into two parts of sublobules, in a form of retuse,
with many inflations on a semicell, inflations penetrated by the pore. Sts. 1,24,
28,29,35,36,40,41,45,51. Europe, U.S.A. New to Thailand.
Elapponicum Schmidle Pl.26, f.7.
Krieger 1937, 604, Pl.85, f.8,9; Ruzicka 1981, 1:2, 497, Pl.81, f.10-14.
L. 48.5 pt m, B. 35 pt m, and I. 6.5 pt m. St. 23. Europe, U.S.A. New to Thailand.
E. longicolle Nordst. var. capitatum W. &GS.West PL21, f.1.
Krieger 1937, 494, Pl.60, f.11; Scott & Prescott 1961, 29, Pl.8, f.4,5.
L. 88 ptm, B. 37.4 ptm, and I. 9.7 x2m. Cells fairly large, approximately 2.3 times
longer than the breadth, deeply constricted at the middle, sinus deep and narrowly
linear; semicells 3-lobed, polar lobe elongate and capitate in the upper part, lower part
of lateral margin slender and concave, lateral lobe rectangular, lateral margin divergent
and retuse; cell wall with a distinct pore in the centre of a semicell, upper part of a po-
lar lobe with many scrobiculations. St. 29. India, Ceylon, Indonesia (Sumatra). New to
Thailand.
E. luetkemuelleri Ducell. Pl.22, f.9,12.
Krieger 1932, 32, Pl.14, f.8; Krieger 1937, 560, Pl.80, f.1-4.
L. 26.4-28 xzm, B. 16.5-17 #m, and I. 3.5 ptm. Cells small, 1.5 times longer than
the breadth, deeply constricted at the middle, sinus narrowly linear; semicells truncate-
pyramidate, apex truncate and retuse at the middie, apical angles rounded, lateral mar-