Encyclopaedia Britannica, 11th Edition, volume 4, Part 3
Encyclopaedia Britannica, 11th Edition, volume 4, Part 3
Various
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In these two genera the elaters are attached to a sterile group of cellsprojecting into the upper end of the capsule, and on dehiscence remainconnected with the tips of the valves. _Pallavicinia_ and some relatedgenera have a definite midrib and broad wings formed of one layer of cells, and are of interest owing to the presence of a special water-conductingstrand in the midrib. This consists of elongated lignified cells withpitted walls. _Blasia pusilla_, which occurs commonly by ditches andstr...eams, affords a transition to the foliose types. Its thallus (fig. 7)has thin marginal lobes of limited growth, which are comparable to the moredefinite leaves of other anacrogynous forms. The ventral surface bears flatscales in addition to the concave scales which, as mentioned above, areinhabited by _Nostoc_. This interesting liverwort produces two kinds ofgemmae, and in the localities in which it grows is largely reproduced bytheir means. In _Fossombronia_, of which there are a number of Britishspecies, the plant consists of a flattened stem creeping on muddy soil andbearing two rows of large obliquely-placed leaves.
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