The Botany of Iceland - 01.12.1916, Blaðsíða 25

MARINE DIATOMS FROM THE COASTS OF ICELAND
369
Sigmata Grun. 1880. V. H. Trt., 396.
Nitzschia Sigma W. Sm. V. H. Trt., 396, Tab. XVI, fig. 531.
12 samples (S. 1, S.W. 8, N. 1, E. 2).
Area: Ubiquist, Grl., A. S.
Nitzschia Sigma W. Sm. var. rigida (Ktz.) Grun. V. H. Trt., 1. c.,
fig. 533.
Búðir (S.W.), H. Js.
Area: Eur., Afr.
Lineares Grun. 1880. V. H. Trt., 398.
Nitzschia vitrea Norman var. Salinarum Grun. V. H. Trt. ,399,
Tab. XVI, fig. 546.
Njarðvik (S.W.), C. H. O.
Area: Eur.
Lanceolatœ Grun. 1880. V. H. Trt.,400.
Nitzschia lanceolata W. Sm. V. H. Trt., 400, Tab. XVII, íig. 548.
Reykjavik (S.W.), B. S.
Rhopalodia O. Muller 1895. V. H. Trt., 307.
Rhopalodia Musculus (Ktz.) O. M. V. H. Trt., 297, Tab. IX, tig. 359.
(Epithemia Musc.)
Steingrimsfjörður (N. 3 samples), H. Js.
Arraphideæ
Synedra Ehr. 1831. V. H. Trt., 307.
Synedra affinis Ktz. V. H. Trt., 314; Per. D. mar., 318.
I have found Synedra afíinis with variants as delineated in V. H. Syn.,
tab. XLI, in Per. I). mar., tab. LXXX, and in A. S. Atl., tab. CCCIV, in all
in 184 samples (S. 13, S.W. 77, N.W. 27, N. 50, E. 17).
Of the numerous variants, difíicult to distinguish from each other,
I have noted the following:
Synedra affinis var. gracilis Grun. V. H. Syn., Tab. XLI, fig. 15B.
Area: Eur., Grl.
Synedra affinis var. fasciculata Ktz. V. H. Syn., 1. c., fig. 15.
Area: Eur., As., Grl., A. S.
Synedra affinis var. lancettula Grun. V. H. Syn., 1. c., íig. 28.
Area: Am., Grl.
Synedra affinis var. parva Ktz. V. H. Syn., 1. c., fig. 23.
Area: Eur., Afr., Aust., Grl., A. S.