Desmids from Thailand and Malaysia

3.
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Desmids from Thailand and Malaysia 87
West & Carter 5, 1923, 235, Pl.162, f.1-4; Prescott et al. 1983, 2:5, 30, Pl.461, f.6-
8.
L. 15.4 ptm, B. 11 ptm. St. 19. India, Burma, Indonesia (Java), Japan, Europe, N. &
S.America, Africa, Australia. New to Thailand.
H. undulata Nordst. var. perundulata GrOnblad Pl.51, f.9.
Scott & Perscott 1961, Hydrobiol. 17, 122, Pl.61, f.4
L. 18.5 ptm, B. 7.5 ptm. St. 23. Indonesia (Sumatra). New to Thailand.
Haplozyga armata (Lofgr. & Nordst.) Racib. var. raciborskii F6rster Pl.50, f.10.
F6rster 7 Eckert 1966, Rev. Alg. 8, 154, Pl.1, f.1.
L. 39.6-42 gem, B. 31-40.5 ptm, and I. 13-14 ptm. Cells of medium size, 1.3 times
broader than the length, moderately constricted at the middle, sinus open rectangularly;
semicells subhexagonal, lateral part produced somewhat like a conical process, the ex-
tremity with a stout, short spine, upper part of a semicell short and cylindrical (slightly
dilated upward), apex truncate, straight, and connected directly to an adjacent cell;
semicell in vertical view with 8 radial, inflated processes, each of which has a short
spine. Sts. 9,36,39,40,41. Brazil. New to Thailand.
Spondytosium iavanicum (Gutw.) Grdnblad var. iavanic"m Pl.50, f.13.
Scott & Prescott 1961, 121, Pl.60, f.10; Prescott et al. 1983, 2:5, 19, Pl.457, f.14,15.
L. 26.4 ptm, B. 28.6-31 ptm, and I. 6-6.5 ptm. Sts. 20,23,24, Indonesia Borneo,
Sumatra), Brazil. New to Thailand.
Sp. nitens (Wall.) Arch. var. triangulare Turner Pl.50, L12.
Turner 1892, 25;5, 44, Pl.18, f.17a,c; Krieger 1932, 220, Pl.26, f.1; Prescott et al.
1983, 2:5 21, Pl.458, f.4,5.
L. 31.7 pm, B. 26.4 Itm, and I. 6.5 ptm. St. 9. India, Burma, Indonesia (Borneo,
Sumatra), Celebes, Canada. New to Thailand.
Sp. planum (Wolle) W. &G.S.West var. planum PL50, f.14,16
West & Carter 1923, 5, 222, Pl.160, f.23-25; Prescott et al. 1983, 2:5, 21, Pl.456,
f.6,7.
L. 13.2-16.7 xtm, B. 16.3-19.8 ptm, and I. 6.5-8 ptm. Cells of medium size, slight-
ly broader than the length, deeply constricted, sinus open and linear, extremity obtuse;
semicells transversely oblong, apex truncate and flattened, the connecting part of a semi-
cellslightly
elevated; side view of a semicell circular. Sts. 18,19,23,25. Europe, U.S.A.
New to Thailand.
1. Groenbladia negtecta (Racib.) Teiling var. neglecta Pl.51, f.2,3.
Scott & Prescott 1961, 122, Pl.61, f.7; Prescott et al. 1983, 2:5, 33, Pl.462, f.1-5.
L. 27.7-30.8 um, B. 10-11 "m, and I. 10.6 ptm. Sts. 19.39. Indonesia (Sumatra),
Europe, Africa, Australia, New Zealand. New to Thailand.
Ia. var. elongata Scott&Prescott Pl.51, f.1.
Scott & Prescott 1961, 123, Pl.61, f.8; Prescott et al. 1983, 2:5, 33, Pl.462, f.6-13,