Desmids from Thailand and Malaysia
Desmids from Thailand and Malaysia
Desmids from Thailand and Malaysia
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78 M. HIRANO<br />
58. St. modestumBehre<br />
Behre 1956, Arch. Hydrobiol.Suppl. 23, 75, Pl.8, f.5a-d.<br />
L 15.4 ptm, B. 20-21 #m, <strong>and</strong> I. 6.5-7.5 ptm. Sts. 25,31. Celebes, Philippines. New<br />
to <strong>Thail<strong>and</strong></strong>.<br />
59. St. mucronatum Ralfs var. subtriangutare W. &G.S.West Pl.38, f.3,4.<br />
West & Carter 1923, 5,12, Pl.130, f.13,14.<br />
L. 27.3 ptm, Bssp. 27.3 ptm, <strong>and</strong> I. 7 ptm. Cells slightly longer than the breadth,<br />
deeply constricted at the middle, sinus widely open <strong>and</strong> extremely acute; semicells<br />
obversely triagular, lateral margins convex, apical angles with a short spine, spine diver-<br />
gent. Sts. 26.43. Burma, Europe. New to <strong>Thail<strong>and</strong></strong>.<br />
60. St. muticum Br6b. Pl.47,f.6.<br />
West 1911, 4, 133, Pl.118, f.16-20; Scott & Prescott 1961, 99, Pl. 52, f.11; Prescott et<br />
al. 1982, 2;4, 257, Pl.331, f.1,2,4,5.<br />
L. 25-39 ptm, B. 14-35 ptm, <strong>and</strong> I. 8.5-11 ptm. Sts. 32,51. Indonesia (Java), Aus-<br />
tralia. New to <strong>Thail<strong>and</strong></strong>.<br />
61. St. o-meari Arch. Pl.44,f.2,3<br />
West & Carter 1923, 5, 13, Pl.132, f.5-8; Prescott et al. 1982, 2:4, 265, Pl.350,<br />
f.1,3,6,7.<br />
L. 20 ptm, Bssp. 20 ptm, <strong>and</strong> I. 8 ptm. Semicells obversely triangular, constriction<br />
deep <strong>and</strong> widely open, apex straight, apical angles with a diverging spine, lateral margin<br />
almost straight. St. 31. Europe, S.America. New to <strong>Thail<strong>and</strong></strong>.<br />
62. St. orbiculare Ralfs var. depressum Roy&Bisset Pl.47, f.12.<br />
Roy & Bisset 1886, Journ. Bot. 24, 234, Pl.268, f.14; Hirano 1959, Contr. 9, 290,<br />
Pl.37, f.18; Scott & Prescott 1961, 1oo, Pl.52, f.12.<br />
L. 31 pt m, B. 31 ptm, <strong>and</strong> I. 8.5 ptm. St. 19. Indonesia (Java, Borneo, Sumatra) Thai-<br />
l<strong>and</strong>, Japan, Europe, Australia.<br />
62a. var. hibernicum W.&G.S.West Pl.38, f.11.<br />
West 1911, 4, 156, Pl.124, f.5-9; Prescott et aL 1982, 2:4, 269, Pl.331, f.11,12.<br />
L.31 #m, B. 26.4 ptm, I. 6.5 ptm. St. 10. Japan, Europe. New to <strong>Thail<strong>and</strong></strong>.<br />
62b. var. ralfsii W. & G.S.West<br />
West 1911, 4, 156, Pl.124, f.12,13,15,16.<br />
L. 37.4 ptm, B. 33 ptm, I. 8.5 Ltm. St. 51. Cosmopolitan. New to <strong>Thail<strong>and</strong></strong>.<br />
63. St. pachyrhynchopo,me Hirano, sp. nov. Pl.51, f.15,16.<br />
Cellulae mediocres, circiter latiores quam longae, profunde constrictae ad extremum,<br />
sinu acute aperto; semicellulae obtriangulares, apice recto vel leviter concavo, angulis<br />
leviter productis et late rotundis, marginibus leviter convexis; membrana punctata sed<br />
glabris ad apicem; semicellulae in vertice visae triangulares, marginibus profunde con-<br />
cavis, angulis truncatis et rotundatis; long. 39.6 ptm, lat. 44 ptm, lat.isthm. 13.2 ptm. St.<br />
19.
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