Abstract
New information presented on the morphology of Stromatopteris includes a description of the mature embryo, of the structure and ontogeny of various leaf‐ and stem‐like axes and roots, and of young gametophytes of spore origin. This new information compounds the difficulty of specifying the organs in classical terminology. It further supports the presumed relationships of this genus to the Psilotaceae and Schizaeaceae. The mature embryo is composed of a lower hemisphere (foot) and an upper hemisphere. An indefinite number of very thin, avascular, primary sporophy‐tic axes originate superficially over the surface of the upper hemisphere and break through the calyptra. All other parts of the sporophyte eventually are derived from these axes. The roots of Stromatopteris , although quite usual in many ways show peculiarities in tissue derivation from cells cut off distally from the apical cell. They are also non‐absorbing organs devoid of root hairs. Long‐cell and short‐cell regions along the various axes are described. In the roots vascular interruption is correlated with short‐cell zones.
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Claims 9
Claim · model-written summary
The new morphology complicates classical organ terminology in Stromatopteris.
- Taxon
- StromatopterisStromatopterise1
- Outcome
- difficulty of specifying the organs in classical terminologye0
Verbatim
e0“This new information compounds the difficulty of specifying the organs in classical terminology.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
The morphology supports presumed relationships with Psilotaceae and Schizaeaceae.
- Taxon
- StromatopterisStromatopterise1
- Outcome
- presumed relationshipse0
- Comparator
- Psilotaceae and Schizaeaceaee0
Not reportedDirection
Verbatim
e0“It further supports the presumed relationships of this genus to the Psilotaceae and Schizaeaceae.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
The mature embryo comprises a foot and an upper hemisphere.
- Taxon
- StromatopterisStromatopterise1
- Organ / stage
- mature embryoe0
- Outcome
- lower hemisphere (foot) and an upper hemispheree0
Verbatim
e0“The mature embryo is composed of a lower hemisphere (foot) and an upper hemisphere.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
Thin avascular primary sporophytic axes originate on the upper embryo hemisphere and emerge through the calyptra.
- Taxon
- StromatopterisStromatopterise1
- Organ / stage
- primary sporophy‐tic axese0
- Outcome
- primary sporophy‐tic axes originate superficially over the surface of the upper hemisphere and break through the calyptrae0
Verbatim
e0“An indefinite number of very thin, avascular, primary sporophy‐tic axes originate superficially over the surface of the upper hemisphere and break through the calyptra.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
All other sporophyte parts derive from the primary axes.
- Taxon
- StromatopterisStromatopterise1
- Outcome
- parts of the sporophyte eventually are derived from these axese0
Verbatim
e0“All other parts of the sporophyte eventually are derived from these axes.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
Stromatopteris roots have unusual tissue derivation from cells distal to the apical cell.
- Taxon
- StromatopterisStromatopterise0
- Organ / stage
- rootse0
- Outcome
- peculiarities in tissue derivatione0
Verbatim
e0“The roots of Stromatopteris , although quite usual in many ways show peculiarities in tissue derivation from cells cut off distally from the apical cell.”
Claim · model-written summary
Stromatopteris roots are nonabsorbing and lack root hairs.
- Taxon
- StromatopterisStromatopterise1
- Organ / stage
- root hairse0
- Outcome
- non‐absorbing organs devoid of root hairse0
Verbatim
e0“They are also non‐absorbing organs devoid of root hairs.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
Stromatopteris axes contain long-cell and short-cell regions.
- Taxon
- StromatopterisStromatopterise1
- Organ / stage
- axese0
- Outcome
- Long‐cell and short‐cell regionse0
Verbatim
e0“Long‐cell and short‐cell regions along the various axes are described.”
e1“morphology of Stromatopteris includes”
Claim · model-written summary
Vascular interruption in roots correlates with short-cell zones.
- Taxon
- StromatopterisStromatopterise1
- Organ / stage
- rootse0
- Outcome
- vascular interruptione0
Not reportedDirection
Verbatim
e0“In the roots vascular interruption is correlated with short‐cell zones.”
e1“morphology of Stromatopteris includes”