Organography of plants, especially of the archegoniatae and spermaphyta . sporium and columellaproceeds in exactly the same way as in Anthoceros, only the intercalary UsiLiUy there are two thickening bands in the longitudinal direction, but they do not run witha straiglit course. ^ See Douglas Campbell, The Structure and Development of Mosses and Ferns, London, 1S95. 96 THE SPOROGQNIUM IN HEPATIC A E growth is less marked, and the division of the archesporium proceeds some-what differently. The structure of the ripe capsule, however, shows remark-able differences. The sporogonium of Notothylas

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Organography of plants, especially of the archegoniatae and spermaphyta . sporium and columellaproceeds in exactly the same way as in Anthoceros, only the intercalary UsiLiUy there are two thickening bands in the longitudinal direction, but they do not run witha straiglit course. ^ See Douglas Campbell, The Structure and Development of Mosses and Ferns, London, 1S95. 96 THE SPOROGQNIUM IN HEPATIC A E growth is less marked, and the division of the archesporium proceeds some-what differently. The structure of the ripe capsule, however, shows remark-able differences. The sporogonium of Notothylas is vmch svialler than thatof Anthoceros and has neither an assimilation-tissue in the capsule nor hasit stomata. Whether the sterile cells share in the scattering of the sporesis unknown ^. Further investigation is required to determine whether somespecies of Notothylas want the columella, at least in the ripe sporogonium Antlioceroteae, in all their characters, appear to be a group sharplydifferentiated from the other Hepaticae, and to be of a considerable

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