Desmids from Thailand and Malaysia
Desmids from Thailand and Malaysia
Desmids from Thailand and Malaysia
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4 M. HIRANO<br />
1) Haplozyga armata var. raciborskii reported by FOrster & Eckert (1966) <strong>from</strong> Brazil<br />
was found in the Phu Kradung samples (1965-66 <strong>and</strong> 1967 collections).<br />
2) The similar form of Ichthyocercus angolensis, the taxon originally reported by West<br />
(1897) <strong>from</strong> Africa, was found in my samples <strong>from</strong> <strong>Thail<strong>and</strong></strong>. I. angolensis has the semicell<br />
with a short apical spine; lateral margins of the semicell almost straight <strong>and</strong> not convex;<br />
slightly concave at the upper part of lateral margins. The similar form of Ichthyocercus lon-<br />
gtspinus was also found in the same locality in <strong>Thail<strong>and</strong></strong>. Moreover, some specimens show<br />
an intermediate form between L angolensis <strong>and</strong> I. Iongtspinus. Some of the specimens<br />
which I indentified as L longispinas include the shorter <strong>and</strong> elongated forms. The typical<br />
form of L longtspinus is characteraized by having an elongated semicell, a longer spine,<br />
slightly tumid at the basal part of the semicell. In the typical form of L angolense, the semi-<br />
cell is shorter than that of I. Iongispinus, having a short spine <strong>and</strong> non-concave lateral mar-<br />
gins.<br />
3) Xanthidium multispinosum sp. nov. <strong>from</strong> <strong>Thail<strong>and</strong></strong> is similar to X. freemanii var. spi-<br />
nossissimum reported by Islam (1970) <strong>from</strong> Dacca, Pakistan. However, the new species is<br />
distinguished <strong>from</strong> the latter by the different form of the semicell.<br />
4) Among the Micrasterias species <strong>from</strong> <strong>Thail<strong>and</strong></strong>, are some which have a curious form<br />
of the semicell divided into two small pieces toward its central direction. Although the simi-<br />
lar phenomenon was already reported in M. doveri var. africana by many authors, no report<br />
has been found in any of other Microsterias species. The form showing the similar variation<br />
which I have found in my samples of Micrasterias rotata <strong>from</strong> <strong>Thail<strong>and</strong></strong> will be described in<br />
the present paper as M. rotata var. curvata var. nov.<br />
<strong>Thail<strong>and</strong></strong>:<br />
L<br />
2.<br />
3.<br />
4.<br />
5.<br />
6.<br />
7.<br />
8.<br />
9.<br />
<strong>Malaysia</strong>:<br />
10.<br />
11.<br />
<strong>Thail<strong>and</strong></strong>:<br />
12.<br />
13.<br />
14.<br />
15.<br />
List of stations (1965 -- 66)<br />
PhuKradung. 28-291XI,1965.<br />
PhuLuang. 1/XII,1965.<br />
Phanuk. 1/XII,1965.<br />
Doi Internon, lower. 18XXII, 1965.<br />
A marshy place located near the summit of Doi Internon.<br />
Doi Step. 31/XII, 1965.<br />
DoiChendao. 6A,1966.<br />
Khao Chong. 291I, 1966.<br />
Khao Luang. 21II, 1966.<br />
List of stations (1967)i)<br />
Kuala Lumpur. 51VIII, 1967.<br />
Sungai Gombak. 6tVIII, 1967.<br />
West of Ranong. 9/VIII, 1967.<br />
A pond of the Forest Department at Bangkok. 161VIII, 1967.<br />
Huai Sai. 18fVIII, 1967.<br />
A rice-field at Tung Gaya, Tung Maprao. 19/VIII, 1967.<br />
1) Sungai: (the local dialect)<br />
season.<br />
19/XII, 1965.<br />
river. Huai: (the local dialect) brook or brooklet found only in the rain
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