Marsilia sentence example

marsilia
  • The Marsiliaceae also include two genera, Marsilia and Pilularia, the latter of which is found in Britain.
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  • The plants grow as a rule in marshy places, though some species of Marsilia are xerophytic. The creeping stem produces roots from the ventral surface and leaves from the dorsal surface; the leaves when young are circinately coiled.
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  • The leaves are simple and linear in Pilularia, but in Marsilia bear a pinnate four-lobed lamina.
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  • The highly specialized sporocarps are borne on the basal portions of the leaves, as a rule singly, but in some species of Marsilia in numbers.
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  • It has a complicated structure in both genera; in Pilularia its shape is nearly spherical, while in Marsilia it is elongated and bean-shaped.
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  • The sori are developed in depressions and are thus protected within the resistent outer wall of the sporocarp. There are usually four sori in Pilularia, while in Marsilia they form two longitudinal rows.
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  • The resemblance of the sporocarp-like bodies - discovered by Nathorst in association with Rhaetic Sagenopteris leaves, and more recently figured by Halle under a new generic name (Hydropterangium) - to the sporocarps of Marsilia is an argument in favour of including Sagenopteris in the Hydropterideae.
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  • Similarly, the genus Sagenopteris, characterized by a habit like that of Marsilia, and represented by fronds consisting of a few spreading broadly oval or narrow segments, with anastomosing veins, borne on the apex of a common petiole, is abundant in rocks ranging from the Rhaetic to the Wealden, but has not so far been satisfactorily placed.
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