. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 7. A and B, the ends of twotricbomes of Tolypotlirix lanata(Desv.) Wartin., showing successivestages of supposed mitosis. Fixedin sulphurous acid and stained withiron - ammonia - alum 1160 (after Kohl). 10 Myxopliycex the nuclear functions are localized. The mere fact that division of theprotoplast may begin by the ingrowth of a ring-shaped septum beforethere is any indication of division in the primitive nucleus seems to
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 7. A and B, the ends of twotricbomes of Tolypotlirix lanata(Desv.) Wartin., showing successivestages of supposed mitosis. Fixedin sulphurous acid and stained withiron - ammonia - alum 1160 (after Kohl). 10 Myxopliycex the nuclear functions are localized. The mere fact that division of theprotoplast may begin by the ingrowth of a ring-shaped septum beforethere is any indication of division in the primitive nucleus seems to showthat that structure has not yet acquired all the physiological attributesof a true cell-nucleus. THE PIGMENTS AND THE CYTOPLASM. In the majority of the Myxo-phyceae the cells are of a rich blue-green colour, the pigments being locatedin the peripheral zone of the protoplast which surrounds the incipientnucleus. There are three pigments of importance, viz. phycocyanin,chlorophyll, and carotin, of which the first is generally the most abundantand to a great extent masks the chlorophyll. It is the combined effectof the phycocyanin and chlorophyl
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