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exannulate sporangia
Marattialean ferns are characterized by exannulate sporangia grouped into synangia. They have a long history and can be dated back to the Carboniferous.
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sp. has radial synangia composed of a ring of 4-7 elongate, exannulate sporangia. Most features of the synangia of S. conicaulis were previously hypothesized ...
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mm. in diameter. They are exannulate, and the sporangial walls are all of approximately the same thickness, about 20 A, the outer wall not being thicker than the ...
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The sporangia bear a general resemblance to exannulate sporangia of Ferns, but present no features sufficiently characteristic to settle the question, especially ...
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and exannulate sporangia may also suggest, to. I Oliver, F. W., ' The Seed, a Chapter in Evolu- tion,' Pres. address to Botanical Section, Brit. Assn. Adv. Sci.
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Upper Carboniferous; some of them are shown on the upper part of Figure 2. Sori and synangia of exannulate sporangia borne on foliage of the Pecopteris type ...
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In their gross morphology these exannulate sporangia with elongated wall cells resemble Musatea, the fructification of PLATE III Reproductive structures of ...
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to consist of exannulate Marattiaceous sporangia. Another interesting point was observed on some of the specimens in the collection of the Geological Survey of ...
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ceae, and Marattiaceae, include types with exannulate sporangia. The. Marsiliaceae and Salviniaceae are probably specialized types and there is evidence in ...
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or five exannulate sporangia arranged in a stellate group, from which circumstance the genus Asterotheca has been proposed for them, though not generally ...
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exannulate sporangia
