以下为句子列表：
英文: As a general rule, forests dominated by angiosperms (broadleaf forests) are more species-rich than those dominated by gymnosperms (conifer or needleleaf forests), although exceptions exist (for example, species-poor aspen and birch stands in northern lati
中文: 作为普遍规则，受被子植物支配的森林（阔叶林）比那些受裸子植物支配的森林（松树或针叶林）物种丰富，虽然有例外存在（例如，种类匮乏的白杨和桦树生长在北纬度地区）。
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英文: Cycadophyta (cycads) A phylum of cone-bearing gymnosperms (about 75 living species) with palmlike compound leaves and special CORALLOID ROOTS at or near the ground surface, which contain symbiotic nitrogen-fixing cyanobacteria.
中文: 苏铁纲（苏铁类植物）：包含球果的一类裸子植物（现存种大约有75种），它们具有掌状的复叶，在近地面处有特殊的珊瑚状的根，根内含有共生的固氮蓝细菌。
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英文: Gymnosperms lack endosperm and the precise double fertilization characteristic of the angiosperms, although some show a primitive form of it.
中文: 尽管裸子植物还保留有某些被子植物的基本形态，但它没有被子植物所特有的胚乳以及双受精现象。
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英文: Hofmeister aso showed that the gametophytes and sporophytes of seed-bearing plants were homologous with those of ferns and mosses and that the gymnosperms formed a plant group between the latter and the angiosperms.
中文: 他认为种子植物的孢子体和配子体与蕨类以及苔藓类是同源的，还指出裸子植物形成了一个单独的组群，它是位于蕨类植物与被子植物之间的一个植物类群。
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英文: In many gymnosperms the nuclei divide within the pollen grain to produce a small number of cells (2-40 depending on the group )representing the male prothallus.
中文: 在许多裸子植物中，细胞核在花粉粒中分裂以产生少量的细胞（2～40个，取决于不同种类），代表雄性原叶体。
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