. Introduction to cryptogamic botany. Cryptogams. 190 INTRODUCTION TO CRYPTOGAMIC BOTANY. et Ordines, Algarum, 1851, places Spongiocarpeas in his order Chondriece, associating it with Loinentaria and Laurencia, But the spongy fruit of the one though in a different Fig. 46. a. Thin slice of Polyides rotundus, Grev., showing the wedge-shaped spores radiating in every direction, magnified. One nucleus is divided through the centre ; a portion only of a second is seen beneath. 6. Tetrasporea young and old, magnified. Both from Mrs. Griffiths. c. Thin slice of Furcellaria fastigiata, Lyngb.
. Introduction to cryptogamic botany. Cryptogams. 190 INTRODUCTION TO CRYPTOGAMIC BOTANY. et Ordines, Algarum, 1851, places Spongiocarpeas in his order Chondriece, associating it with Loinentaria and Laurencia, But the spongy fruit of the one though in a different Fig. 46. a. Thin slice of Polyides rotundus, Grev., showing the wedge-shaped spores radiating in every direction, magnified. One nucleus is divided through the centre ; a portion only of a second is seen beneath. 6. Tetrasporea young and old, magnified. Both from Mrs. Griffiths. c. Thin slice of Furcellaria fastigiata, Lyngb., magnified, showing a nucleus with the dividing spores. Prom a specimen communicated by Lenormand.* d. One of the large cells, to show its granular contents, which are of a beautiful violet, when treated with the compound iodide of potassium and sulphuric acid. The contents of the spores, on the contrary, be- come yellowish brown. e. Tetraspore, after Harvey. All more or less magnified. filled with nuclei, can scarcely be compared with the naked conceptacles of Chondria, with their single nucleus and basal spores. Dr. Harvey's notion, however, of the fruit does not accord with my observations. The placenta arises either distinctly * Unfortunately, I can find no fruit in specimens from Mrs. Griffith,"., supposed to have perfect spores, and cannot, therefore, compare what I find in Lenormand's specimen with the plant as examined by Harvey. The differences, however, are of little importance. One great distinc- tion in the structure of Polyides and Furcellaria is, that in the latter so many horizontal cells traverse the medullary fibres, as represented in the figure. The external cells vary extremely in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Berkeley, M. J. (Miles Joseph), 1803-1889. Lond
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