Desmids from Thailand and Malaysia

4a. var. alternans Skuja
5.
6.
7.
8.
9.
Desmids from Thailand and Mataysia
Skuja 1949, 149, Pl.33, f.16; Scott & Prescott 1961, 80, Pl.40, f.2.
Lssp. 48.4 #m, Lcsp. 83,6 ym, Bssp. 49.3 #m, Bcsp. 74.8 ptm, and
10,47,49. Burma, Indonesia (Borneo). New to Thailand.
Pl.36, f.1.
I. 10 ptm. Sts.
X. controversum W.&G.S.West Pl.36, f5.
West 1911, 4, 59, Pl.107, f.5,6; Prescott et al. 1982, 2:4, 63, Pl.316, f.3.
L. 37-44 ptm, B. 33-35 ptm, and I. 10 ptm. St. 53. Europe, N. & S.America. New
to Thailand.
X. cristatum Breb. var. delpontei Roy&Bisset Pl.36, f.6.
West 1911, 74, Pl.111, f.5.
Lssp. 53 ptm, Bssp. 51 ptm, and I. 11 Ltm. St. 34. Europe. New to Thailand.
X. freemanii W.&G.S.West PL34. f.5.
West 1902, Trans. Linn. Soc. Bot. 6, 158, Pl.20, f.28.
Lssp. 121 ptm, Bssp. 74.8 um, and I. 22 ptm. Cells large, approximately 1.6 times
longer than the breadth without spines, deeply constricted at the middle, sinus narrowly
linear but outer part acutely open; semicells broadly ovate, apex slightly convex, lateral
margin convex and convergent upward; cell wall densely punctate, lateral margin with a
series of spines at and within the side, spines sharp and curved upward. St. 24. Ceylon.
New to Thailand.
X. hastiferum Turner var. javanicum (Nordst.) Turner f. planum Turn. Pl.33, f.1.
Turner 1892, 25, 100, Pl.12, f.23, Pl.13, f.6; Scott & Prescott 1961, 81, Pl.40, f.5; Pre-
scott et al. 1982, 2:4, 71, Pl.326, f.6.
Lssp. 46-62 ptm, Bssp. 48.4-70 ptm, and I. 10-15 ptm. Semicells slightly broader
than the length without spine, apical spines more developed than those of the typical
form and apical spines smaller than the lateral spines. Sts. 22,25,32. India, Indonesia
(Java, Sumatra), U.S.A. New to Thailand.
X. multispinum Hirano, sp. nov. Pl.35, f.1,2.
Cellulae magnae, circiter 1,3-1.5 plo longiores quam latae sine spinis, profunde con-
strictae ad medium, sinu angusto lineari extremo leviter dilatato; semicellulae
triangulari-pyramidatae, apice leviter convexo, angulis apicalibus late rotundatis, margi-
nibus lateralibus leviter concavis, angulis basalibus late rotundatis, membrana dense et
minute scrobiculata in centro semicellularum, margine laterali unoquoque et apice serie
spinarum acutarum praedito et serie spinarum similium numerosarum intra marginem;
serie horisontali conicarum centicularum magnarum transverse supra isthmum praedita;
isthmo excavato apice denticulis magnis conicis praedito. Long. 193-198 ptm, lat. 145
"m, lat. isthm. 41.8 xtm. St. 10.
Type: Pl.35, f.1,2. Loc. Kuala Lumpur, Malaysia.
Cells large, approximately 1.3-1.5 times longer than the breadth excluded spines,
deeply constricted at the middle, sinus narrowly linear in the extremity but slightly open
to the outer part of constriction; semicells triangulari-pyramidal, apex convex, apical
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