Desmids from Thailand and Malaysia

Desmicts from Thailand and Malaysia 69
Skuja 1949, 154, Pl.34, f.28, 29; Scott & Prescott 1961, 86, Pl.53, f.8.
L. 11 ptm, Bcpr. 22 xtm, and I. 4 ptm. St. 19. Burma, Indonesia (Borneo). New to
Thailand.
10. St. brachiatum Ralfs Pl.40,f.1,3.
West & Carter 1923, 5, 88, Pl.141, f.14, 15, Pl.142, f.1-7; Skuja 1949, 155, Pl.34,
f.24; Scott & Prescott 1961, 86, Pl.54, f.12; Pl.55, f.10.
Lcpr. 17.6 "m, Bcpr. 17.6 ptm, and I. 5.7 #m. St. 36. Cosmopolitan.
11. St. brebispinum (Breb.) Ralfs
Prescott et al. 1982, 2:4, 150, Pl.332, f.11,16.
L. 35 ptm, B. 28.6 pm, I. 9 ptm. Cells medium sized, approximately 1.2 times longer
than the breadth, moderately constricted at the middle, sinus open and acuminate at the
extremity; semicells broadly reniform or subelliptic, apex convex with a papilla or denti-
culation at the lateral margin; vertical view of a semicell triangular, sides slightly con-
cave or almost straight, angles broadly rounded, with a papilla. St. 47. Cosmopolitan.
12. St. burkillii W. & G.S.West
W. & G.S.West 1907, Ann. Roy. Bot. Gard. Calcatta 6:2, 216, Pl.16, f.3.
L. 97-113 ptm, B. 96-99 ptm, I. 36 pm. St. 22. Burma. New to Thailand.
13. St. calyxoides Wolle var. orientale Scott & Prescott Pl.48, f.10,11.
Scott & Prescott 1961, 87, Pl.55, f.1,2.
Lssp. 22-24 ptm, Bssp. 22-26 ym, and I. 12-13 ptm. Cells moderate in size, mod-
erately constricted at the middle, sinus moderately open; semicells obtrapeziform, Iateral
margins slightly retuse, apex somewhat convex, apical angles with a long, stout and
almost erected but somewhat incurved spines; vertical view of a semicell hexagonal,
sides straight, angles with a spine strongly curved in one direction. Sts. 36,39,40,41. In-
donesia (Sumatra). New to Thailand.
14. St. cerctstes Lund. var. coronatum Krieger Pl.43, f.5,6.
Krieger 1932, 194, Pl.19, f.5; Scott & Prescott 1961, 87, Pl.55, f.1,2; Hirano 1967,
Nat. Life SE. Asia, 5, 64, Pl.14, f.1,2.
L. 35-37 pm, Bcpr. 35-44 xim, and I. 7.5-8.5 ptm. Cells slightly broader than the
length including processes, moderately constricted, sinus open acutely and apex acumi-
nated; semicells campanulated, lateral margins inflated, apical angles produced into a
long, strongly incurved process, verrucose in the upper margin and smooth in the lower
margin. Sts. 7,35,36,39,40,41. Burma, Thailand, Indonesia (Sumatra).
14a. var. pulchrum Scott&Gr6nblad Pl.49, f.7.
Scott & Prescott 1957, Act. Soc. Fenn. II, B:8, 33, Pl.20, f.5; Scott & Prescott 1961,
87, Pl.56, f.7; Prescott et al. 1982, 2:4, 155, Pl.440, f.8.
L. 35 ptm, Bcpr. 50.6 ptm, and I. 8 pm. St. 23. Indonesia (Sumatra). New to Thai-
land.
15. St. ceylanicum W. &G.S.West