Desmids from Thailand and Malaysia

76 M. HIRANO
46a. forma minus Scott & Prescott
Scott & Prescott 1961, 96, Pl.50, f.8,9.
L. 35 ptm, Bcpr. 66 ptm, and I. 11 ptm. Semicells campanulate, 1.9 times broader
than the length including processes, apex slightly convex and with 6-8 emarginate ver-
rucae, basal part of a semicell inflated and 2 emarginate verrucae disposed, angles pro-
duced into a process long, horizontal or slightly incurved, apical verrucae gradually be-
come undulate in the apex. St. 27. Indonesia (Java, Borneo). New to Thailand.
47.
St. tnflexum Breb.
West & Carter 1923, 5, 108, Pl. 143, f.7,8; Skuja 1949, 158, Pl.35, f.2; Prescott et al.
1982, 2:4, 224, Pl.441, f.3,5,8.
L. 22-33 #m, Bcpr. 31-44 Itm, and I. 6.5-8 #m. Sts. 19,24,32,51. Japan, Europe,
N.America. New to Thailand.
48. St. javanicum (Nordst.) Tumer var. apiculiferum (Turner) Krieger Pl.44, f.11,12.
Krieger 1932, 201, Pl.20, f.3; Scott & Prescott 1961, 97, Pl.44, f.6.
L. 48-66 ptm, Bcpr. 79-101 ptm, and I. 6.5-15.4 ptm. Cells large, 1.4 times broad-
er than the length including processes, moderately constricted at the middle; semicells
cup-shaped, apex straight and verrucose, verrucae 4, apical angles produced into a pro-
cess, process long, denticulated and tapering toward the extremity, and with a spine,
base of a process with verrucae on the ventral margin, dorsal margin of a process verru-
cose at the base and verrucae becoming dentated toward the apex, ventral side of a pro-
cess undulate at the end; vertical view of a semicell triangular, sides almost straight or
scarcely concave, with a series of verrucae within the sides of the body, margin of pro-
cess undulate and with denticulations instead of verrucae. Sts. 1,7,10,25,35,36,39,
40,41,51. Indonesia (Java, Sumatra), Japan. New to Thailand.
49. St. Ieptodermum Lund. var. ikapoae (Schmidle) W. & G.S. West Pl.37, f.4.
West 1907, Ann. Roy. Bot. Gard. Calcatta 6, 213, Pl.16, f.8.
Lssp. 24-31 xtm, Lcsp. 26.4-39.6 ptm, Bssp. 24-25 ptm, Bcsp. 26-39 um, and I. 9
-11 ptm, Sts. 9,39. Burma. New to Thailand.
49a. f. minor LUtkem.
LUtkemUller 1900, Ann. k.k. Nat. Hist. Hofm. 15, 123, Pl.6, f.30,31; Skuja 1949, 158,
Pl.34, f.18; Hirano, 1959, Contr.9, 308, Pl.39, f.17.
Lssp. 28-31 ptm, Lcsp. 33-39 ptm, Bssp. 24-26.4 "m, Bcsp. 26.4-27.3 ptm, and I.
8-10 um. Sts. 1,4,35,36,40. China, Burma, Japan. New to Thailand.
50. St leptopus Krieger var. variabile Skuja Pl.40, f.4, Pl.46, f.1.
Skuja 1949, 159, Pl.34, f.12,23.
Lssp. 22-26.4 ptm, Lcsp. 53-85 ptm, Bssp. 13 ptm, Bcsp. 66-85 ptm, and I. 5.7-7.5
pm. Sts. 18,19. Burma. New to Thailand.
51. St. leptocladum Nordst. Pl.45,f.7.
Smith 1924, Wisc. Bull. 57, 102, Pl.78, f.1-7; Hirano 1959, Contr. 9, 377, Pl.50, f.6;
Prescott et al. 1982, 2:4, 234, Pl.406, f.2,3.