fern GRE专八

Ferns grow in shady and moist places.

羊齿类植物生长在阴暗潮湿地方。

Apospory is found in some mosses and ferns.

孢子生殖存在于一些苔藓和蕨类植物。

The ultrastructure of the blepharoplast and the multilayered structure (MLS) in the fern Osmunda cinnamomea var.

精子发育过生毛体和多层结构超微结构进行了研。

Apomixes is comparable to the conditions of apogamy and apospory, which are seen in many ferns.

在许多蕨类植物常见融合生殖包子生殖和孢子生殖。

Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.

蕨类植物是最早登陆维管植物，至今仍然是生态系统初级生产力重要组成部分。

The Kizilsu palynofloras are characterized by the dominance of coniferae, abundance of schizaeaceous ferns and presence of primitive angiospermous pollen.

克孜勒苏群孢粉组合以松杉目优势、真蕨目海金沙科显赫和原始被子植物出现为特征。

Rhizoid A unicellular rootlike structure found in certain algae and in the gametophyte generation of the bryophytes and some ferns.

在一些藻类、苔藓植物和裸子植物子体存在由单个细胞形成类似根结构。

Indusium The flap of tissue, derived from the placenta, that encloses the developing sporangia in the sorus of a fern.

是一种起源于胎座（应为叶表皮译者注）瓣片状组织，覆盖在蕨类植物孢子囊群正在发育孢子囊上。

Here in the rainforest, the giant ohia lehua trees and hapuu ferns provide protective canopy to an amazingly diverse collection of plants and animals.

就在这片雨林，高大ohia lehua树和那叫hapuu蕨类植物给丰富得令人惊奇动植物撑起了一把保护伞。

Homosporous ferns produce sporophytes by intra gametophytic selfing, inter gametophytic mating, or apogamy.Gametangium ontogeny, genetic load, and ploidy affect the mating system of each species.

摘要同型孢子蕨类孢子体可经由同子体自交、异子体交两类育系统或以生殖方式产生，异子体交又可分为异子体自交和异子体异交两种方式。

Characteristics: Terrestrial ferns; stipes tuft, backlish at base; young fronds pinnaye with wider pinnae, when getting older, the fronds become bipinnate or tripinnatifid with slender pinnules.

地生，叶柄丛生，基部黑色；较年轻叶子一回羽状复叶，较老叶子二回或三回羽状复叶。