The Botany of Iceland - 01.12.1916, Qupperneq 24

368
ERNST 0STRUP
fíacillaria Grun. 1880. V. H. Trt., 392.
Nitzschia paradoxa (Gmel.) Grun. V. H. Trt., 392, Tab. XVI, lig. 518.
Isafjörður (N.W.), C. H. O.
Area: Eur., Afr., As., Am., Grl., A. S.
Nitzschia socialis Greg. Cl. & Grun. A. D., 85; V. H. Syn., Tab.
LXI, fig. 8.
9 samples (S. 1, S.W. 3, N.W. 1, N. 3, E. 1).
Area: Eur., Afr., As., Am., Grl., A. S.
Vivaces Grun. 1880. V. H. Trt., 392.
Nitzschia islandica sp. nov. Tab. nost., fig. 13.
Long.: 94 p, lat.: 12 /u, str. 19—20 in 10 /t, punct. car. 6,5 in 10 /t.
Valva late-lineari, media in parte leniter contracta, apices api-
culatos versus attenuata. Carina admodum excentrica, sinuata.
Kolbeinsá (N.), H. Js.
I think the somewhat excentric keel qualifies this species to be classed
under »Vivaces«. See also fig. 522 of N. vivax in Per. D. mar., tab. XVI.
Spathulatœ Grun. 1880. V. H. Trt., 393.
Nitzschia angularis W. Sm. V. H. Trt., 393, Tab. XVI, fig. 521.
10 samples (S. 2, S.W. 6, N.W. 1 N. 1).
Area: Eur., As., Am., Aust., Grl., A. S.
Nitzschia angularis W. Sm. var. affinis Grun. V. H. Trt. 1. c., Tab.
1. c., fig. 522.
4 samples (S. 1, S.W. 2, E. 1).
Area: Eur., Grl.
Dissipatœ Grun. 1880. V. H. Trt. 394.
Nitzschia dissipata (Ktz.) Grun. var. Acula Hantzsch. V. H. Trt.,
395, Tab. XVI, íig. 527. (N. v. d. acuta).
Isafjörður (N.W.), C. H. O., Prestbakki (N.), H. Js.
Area: Eur., Aust.
I have retained the name »Acula«, as this undoubtedly is the correct
one. This form is, as far as I know, flrst described in Cl. & Gr. A. D.
(1880), pag. 90 under the name of Nitzschia Acula Hantzsch. It is found
under the same name as a var. of N. dissipata in V. H. Syn. (1885), pag. 178,
and in the text to tab. LXIII, fig. 4. But »Acula« is everywhere altered
to »acuta« in De Toni Syll. (1892) pag. 527, V. H. Trt. (1899), pag. 395 and
in Per. D. mar. (1897—1908), pag. 281. If »Acuta«, by Hantzsch or Grunow,
has been considered an error in writing, I do not know, but »Acula« is
however, perhaps not a particularly good Latin word, meaning »a small
needle* (see Arnesen: »Ny latinsk Ordbog«, Kjobenhavn 1848, pag. 56)
but the term is very apposite to the variety in question.