A floristic study of the soil algae of the Ongul Islands, Antarctica by means of crude cultures has taken. The following results are noteworthy.
1) Twenty-eight genera and thirty-two species including sixteen specis of Chlorophyceae, four species of Xanthophyceae, three species of Bacillariophyceae and nine species of Cyanophyceae are recognized.
2) The following algae are the most 'abundant species found in the soils of the Ongul Islands ; viz. Stichococcus bacillaris NAEG., Koliella helvetica (KoL.) HINDAK, Bumilleria exilis KLEBS, Phormidium tenue (MENEGH.) GoM. and Nostoc punctiforme (KUETZ.) HARIOT.
3) The following algae are new records from Antarctica ; viz. Chlamydomonas agloeformis PASCHER, Carteria simplex PASCHER, Stichococcus exiguus GREN., Bracteacoccus irregularis (PETERSEN) STARR, Kentrosphaera bistolae G. M. SMITH, Dictyosphaerium elegans BACHMANN, Cosmarium cucurubita BREB., Monodus subterraneus PETERSEN, Botrydiopsis arhiza BORZI, Bumilleria exilis KLEBS, Monocilia viridis GREN., Tolypothrix bouteillei (BREB. et DESM.) FORTI and Tolypothrix fragilis (GARDN.) GEITLER.
4) The algal natural growths found in the Ongul Islands are generally composed of such algae as Synechococcus aeruginosus NAEG., Aphanocapsa grevillei (HASS,) RABENH., Nostoc punctiforme (KUETZ.) HARIOT and et. al.
5) A catalogue raisonne including thirty-two species recognized in soils of the Ongul Islands is given.