Desmids from Thailand and Malaysia

19.
20.
21.
22.
23.
24.
Desmi(ts from Thailand and Malaysia 53
E. gnathophorum W.&GS.West PL24, f.8.
West 1897, Jour. Linn. Soc. Bot. 33, 160, Pl.9, f.3,4; Krieger 1932, 213, Pl.21, f.6;
Krieger 1937, 13:1, 508, Pl.63, f.15-17.
L. 66-79 ptm, B. 33-42 ptm, and I. 9-13 pm. Sts. 1,24,27,28,36,38,39,40,49.
Ceylon, Singapore, Indonesia (Sumatra), Japan.
Ehorikawae Hinode Pl.24, f.3,6.
Hinode 1960, Hikobia 2, 113, f.3:16-18.
L. 92-95 ptm, B. 75-77 ptm and I. 22-29 ptm. Cells large, 1.5-1.7 times longer
than the breadth, deeply constricted, sinus narrowly linear; semicells semicircular, 3-
lobed, incision between polar and lateral lobes fairly deep and open: semicircular and
rounded at the extremity, lateral lobe slightly larger than that of a polar lobe, lateral
margin with many crenation, polar lobe divided into 2 parts, median incision of apex ex-
cavated; semicells with 3-protuberances transverseiy, each protuberance consists of many
granules disposed in circular series, but in some specimens granules confined to the out-
er part and disposed in circular series. Sts. 19,22,24. Indonesia (Sumatra), Japan. New
to Thailand.
E. indicum Krieger var. capitatum Krieger Pl.23, f.11.
Krieger 1932, 213, Pl.22, f.5; Krieger 1937, 534, Pl.61, f.10-12; Hirano 1959, Contr.
Biol. Kyoto Univ.248, Pl.31, f.15.
L. 62-75.5 ptm, B. 31-34 #m, and I. 4-11 pm. Indonesia (Sumatra), Japan. New
to Thailand.
E. inerme (Ralfs),Lund. var. glabrum Borge Pl.24, f.5.
Borge 1906, 25, f.1; Krieger 1937, 507, Pl.63, f.27-29.
L. 40-44 ltm, B.23-26.5 Ltm, and I. 6.5-7.5 um. Sts. 1,36,40,41. S.America. New
to Thailand.
E. insulare (Wittr.) Roy Pl.26, f.13; Pl.27, f.9
West 1905, 2, 68, Pl.40, f.11-13; Krieger 1937, 555, Pl.76, f.11-14; F6rster 1982,
329, Pl. f.15,16.
L. 20-21 gm, B. 14-17 ptm, and I. 4-5.7 Ltm. Cells small, 1.5 times longer than
the breadth, sinus narrowly linear; semicells subrectangular, basal angles rectangular,
lateral margin retuse at the middle, polar lobe transversely rectangular, apical angle
slightly rectangularly rounded, apex retuse at the middle. Sts. 26,43. Ceylon, Thailand,
Europe, U.S.A. Cosmopolitan.
E. intermedium CL in Krieger 1937, 532, PL71, f.6-8. PL21, f.2.
var. rotundutum Hirano, var. noy.
Var. Iobis polaribus et lateralibus bene rotundatis, tumore centrali cum poris singulis,
incisura mediana semicellularum profunde constricta, sinu acute aperto et acuminato ad
extremum. Long.70.5-83 ptm, lat. 37.5-39.6 #m, lat. isthm. 11-13 ptm.
Type: Pl.21, f.2. Loc. Botanical Ganden, Chiengmai, Thailand.
Cells approximately twice as long as the breadth, deeply constricted at the middle,