Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 26. Plagiochasma Aitonia. Maleplant, with five antherldial groups, seen fromabove. The scales upon the under side bendover the vegetative point. The youngerantheridial groups are protected also byoverlapping scales which form their perichae-tiutn. Magnified Fig. 27. Marchantia chenopoda. An Andine species. Apexof the thallus seen from below-. There are two rows of the upper left side of the figure an additional one isvisible. Each scale has an apical appendage which originallyarched o\ er the vege
Organography of plants, especially of the archegoniatae and spermaphyta . Fig. 26. Plagiochasma Aitonia. Maleplant, with five antherldial groups, seen fromabove. The scales upon the under side bendover the vegetative point. The youngerantheridial groups are protected also byoverlapping scales which form their perichae-tiutn. Magnified Fig. 27. Marchantia chenopoda. An Andine species. Apexof the thallus seen from below-. There are two rows of the upper left side of the figure an additional one isvisible. Each scale has an apical appendage which originallyarched o\ er the vegetative point and subsequently falls 15. which is sharply marked off from the broad scale, is darker in colour than it,and has at its base a constriction at which its edges are bent constriction corresponds exactly to the tvidtJi of the apical the apex these apical appendages alone are bent, and they lie upon itlike the leaves of a book ; subsequently they are displaced to the under sideof the thallus and then readily fall off. They have now become functionless,their work has been done ; but this is not the case with the scales. These havestill an important duty. The scales lying upon the midrib form a canal withinwhich the tufts of rhizoids run to penetrate the soil further back under
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Keywords: ., bookcentury1900, bookdecade1900, bookido, booksubjectplantanatomy
