Pithophoraceæ—a new Order of Algæ—One of the most important and interesting of recent memoirs contributing to our knowledge of the Algæ is that by Dr. Veit Brecher Wittrock, of the University of Upsala, “On the Developmentand Systematic Arrangement of the Pithophoraceæ, a new Orderof Algæ,” (·Nova Acta Reg. Soc. Sc. Upsal×1877). This new Order belongs to Chlorophyllophyceæ, and as yet contains but a single genus Pithophora, Wittr., made up of eight (as yet known) species (with a probable ninth, already partially known to the author).

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