A History of the British Freshwater Alg Including Descriptions of the Desmide

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A History of the British Freshwater Alg Including Descriptions of the Desmide
Arthur Hill Hassall
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Kutzing, in his " Phycologia Generalis, " has established the genus Tolypothrix, which I here adopt. In the genus Ca- lothrix Ag. Kutzing describes only C. Mirabilis, a production which differs essentially and generically from the proper Calothrices, all of which Kutzing refers to his new genus. A preferable arrangement I conceive would have been to have constituted a new genus for the single species C. Mira- bilis, and to have allowed the Calothrices to have remained in the genus in which they
... have been so long placed, and the nature of which is so well understood by algologists.
a. Branches discrete.
1. TOLYPOTHRIX PUNCTATA Hass.
Plate LXIX. Fig. 3.
Char. Filaments somewhat irregular, very sparingly branched, diameter considerable. Cells not quite so long as broad, nucleated.
Hob. Under a cascade, co. Wicklow : Mr. Moore.
This species is larger than T. Distorta, and the filaments less uniform ; the branches are rarely formed, and the cells punctated.
2. TOLYPOTHRIX DISTORTA Kutz.
Plate LXIX.


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