Abstract
1. In the present study and the already reported studies of the author, the characteristics of a certain thermobiotic alga which has been named Cyanidium caldarium, a member of Cyanophyceae were much more clarified, namely;(1) Plant cell is unicellular and spherical.(2) Plant cell contains a single parietal laminate chloroplast which lacks pyrenoid.(3) Plant is reproduced by means of endospore-formation.(4) Pigments contained in a cell are chlorophyll a and phycocyan and there never exist chlorophyll b and phycoerythrin.(5) Plant never produces starch as its assimilatory product, but may be assumed to be floridean starch, glycogen or soluble dextrine.(6) Plant cell never shows the differentiation between centroplast and ectoplast as will generally be seen in Cyanophyceae but contains definitely shaped aggregation of chromatins which must be called nucleus.2. Characteristics of genera of Porphyridiaceae and Phragmonema of Phragmonemaceae were compared with one another.3. By way of conclusion, a new genus, Rhodococcus, (non Hansgirg!) was established with Rhodococcus caldarius (Tilden) Hirose.
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