Desmids from Thailand and Malaysia

52 M. HIRANO
(Borneo, Sumatra), Japan, Europe, N.America, Africa. New to Thailand.
14a. var. pseudelegans (Turner) W.&G.S.West Pl.30, f.2.
Krieger 1937, 595, Pl.81, f.19; Hirano 1967, Nature Life SE Asia, 5,58.
L. 32 ptm, B. 22 ptm, and I. 6.5 ptm. St. 31. India, Thailand, Europe, N.America.
15. E. exile Joshua var. exile Pl.29, f2,3.
Joshua 1886, Jour. Linn. Soc. Bot. 21, 640, Pl.23, f.16-18; Krieger 1932, 212, Pl.20,
f.11; Krieger 1937, 578, Pl.74, 32-34.
L. 22-31 um, B. 13-17 ptm, I. 4.5-6ym. Cells small, 1.7 times longer than the
breadth, deeply constricted at the middle, sinus narrowly linear, 3-lobed, polar lobe rec-
tangular, apex straight, non-retuse at the middle, apical angles with a short spine erected
upward, side convex, incision between polar and lateral lobes slightly retuse, lateral
lobes retuse. Sts. 24,25,26,27,29,40. Burma, Indonesia (Sumatra, Bali). New to Thai-
land.
15a. var. latum Hirano, var. nov. Pl.51, f.14.
Cellulae submediocres, profunde constrictae, sinu angusto-lineari; semicellulae triloba-
tae, lobis polaribus transverse rectangularibus, apice retuso, angulis apicalibus cum spi-
nis minutis divergente productis, marginibus lateralibus convexis; membrana cum scrobi-
culis irregulariter dispositis, Long. 33 Ltm, lat. 19.4 ptm, lat. isthm. 5.7 ptm. Sts. 35,39.
Type: Pl.51, f.14. Loc. Phu Kvadung, Thailand.
Cells medium sized, deeply constricted, sinus angusto-linear; semicells trilobe, polar
lobe transversely rectangular, apex retuse, apical angles with a minute, diverging spine,
lateral margin convex; cell wall with scrobiculations irregularly disposed.
16. E.fissumW.&G.S.West Pl.25,f.12.
West 1902, Trans. Linn. Soc. Bot. 6, 154, Pl.20, f.17; Krieger 1937, 596, Pl.82,
f.13,14.
L. 31 ptm, B. 19.6 ptm, and I. 6.5 ptm. Cells small, 1.8 times longer than the
breadth, deeply constricted at the middle, sinus narrowly linear, apical incision of a
semicell deep and slightly linearly open, dilated at the extremity; apex broadly rounded,
incision between polar and lateral lobes shallow and rounded, lower lateral margin di-
vergent and truncate; cell wall with 3-curved, long granules on the central inflation. Sts.
25,53. Ceylon. New to Thailand.
17. E. gemmatum Breb. var. tenuis Krieger
Krieger 1937, 641, Pl.92, f.12-13; Prescott et al. 2:2, 63, Pl.82, f.7,7a.
L. 38-42 xtm, B. 26-27 gm, and I. 8-9 xzm. Sts. 1,36,39,40. Brazil. New to Thai-
land.
18. E. gessneri Krieger & Bourr. var. laticeps Scott & Prescott Pl.27, f.8,9.
Scott & Prescott 1961, Hydrobiol. 17, 27, Pl.14, f.11.
L 39-42 ptm, B. 31-32 xtm, and I. 11-12 xtm. Sts. 1,3,40. Indonesia (Borneo,
Sumatra). New to Thailand.