fern GRE专八

Ferns grow in shady and moist places.

羊齿类长在阴暗潮湿的地方。

Apospory is found in some mosses and ferns.

无殖存在于一些苔藓和蕨类。

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

精发育过程的毛体和多层结构的超微结构进行了研。

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

在许多蕨类常见的无融合殖包括无配殖和无殖。

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

蕨类是最早登陆的维管，至今仍然是态系统初级产力的重要组成部分。

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

克孜勒苏群粉组合以松杉目的优势、真蕨目海金沙科的显赫和原始被的出现为特征。

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、苔藓和裸配体存在的由单个细胞形成的类似根的结构。

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）的瓣片状组织，覆盖在蕨类囊群正在发育的囊上。

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，高大的ohia lehua树和那叫hapuu的蕨类给丰富得令人惊奇的动撑起了一把保护伞。

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.

摘要同型蕨类的体可经由同配体自交、异配体交配两类配育系统或以无配殖的方式产，异配体交配又可分为异配体自交和异配体异交两种方式。

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，叶柄丛，基部黑色；较年轻的叶一回羽状复叶，较老的叶二回或三回羽状复叶。