Definition of heterosporous in US English:

heterosporous

adjective-ərəˈspôrəsˌhetəˈräspərəs

Biology

Producing two different kinds of spores.
Example sentencesExamples
- Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus.
- Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms.
- Isoetes helps discriminate between these explanations as it lacks vessels and has a large genome despite being heterosporous, suggesting that vascular evolution is the key factor.
- Therefore, improved sampling and a better understanding of the morphology of fossils with affinities to these families are necessary to understand the origin and evolution of the heterosporous fern clade.
- Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.

Derivatives

heterospory

noun

According to this argument, heterospory was the intermediate between homosporous free-sporing reproduction and the retained endosporic gametophyte of the seed habit.
Example sentencesExamples
- The Order Isoetales and Lepidodendrales are sometimes included in the Subclass Ligulatae - defined by the presence of ligules, heterospory, and endospory.
- Since the ‘seed habit’ begins with the reduction to a single functional megaspore in each megasporangium, heterospory seems like a logical intermediate step.
- W.A. DiMichele has argued that free-sporing heterospory will only be favored in swamp environments, where gametes can move easily between unisexual gametophytes.

Definition of heterosporous in US English:

heterosporous

adjectiveˌhetəˈräspərəs

Biology

Producing two different kinds of spores.
Example sentencesExamples
- Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms.
- Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
- Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus.
- Therefore, improved sampling and a better understanding of the morphology of fossils with affinities to these families are necessary to understand the origin and evolution of the heterosporous fern clade.
- Isoetes helps discriminate between these explanations as it lacks vessels and has a large genome despite being heterosporous, suggesting that vascular evolution is the key factor.

单词	heterosporous
释义	Definition of heterosporous in US English: heterosporous adjective-ərəˈspôrəsˌhetəˈräspərəs Biology Producing two different kinds of spores. Example sentencesExamples Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus. Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms. Isoetes helps discriminate between these explanations as it lacks vessels and has a large genome despite being heterosporous, suggesting that vascular evolution is the key factor. Therefore, improved sampling and a better understanding of the morphology of fossils with affinities to these families are necessary to understand the origin and evolution of the heterosporous fern clade. Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores. Derivatives heterospory noun According to this argument, heterospory was the intermediate between homosporous free-sporing reproduction and the retained endosporic gametophyte of the seed habit. Example sentencesExamples The Order Isoetales and Lepidodendrales are sometimes included in the Subclass Ligulatae - defined by the presence of ligules, heterospory, and endospory. Since the ‘seed habit’ begins with the reduction to a single functional megaspore in each megasporangium, heterospory seems like a logical intermediate step. W.A. DiMichele has argued that free-sporing heterospory will only be favored in swamp environments, where gametes can move easily between unisexual gametophytes. Definition of heterosporous in US English: heterosporous adjectiveˌhetəˈräspərəs Biology Producing two different kinds of spores. Example sentencesExamples Many paleobotanists believe that the earliest seed plants evolved from heterosporous Middle Devonian plants like the progymnosperms. Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores. Some of the large sphenophyte trees of the Paleozoic were heterosporous, producing large megaspores and small microspores, and probably retaining the megaspore in the strobilus. Therefore, improved sampling and a better understanding of the morphology of fossils with affinities to these families are necessary to understand the origin and evolution of the heterosporous fern clade. Isoetes helps discriminate between these explanations as it lacks vessels and has a large genome despite being heterosporous, suggesting that vascular evolution is the key factor.
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