fern GRE专八

Ferns grow in shady and moist places.

类物生长在阴暗潮湿的地方。

Apospory is found in some mosses and ferns.

无孢子生殖存在于一些苔藓和类物中。

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

精子发育过程中的生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.

在许多类物中常见的无融合生殖包括无配子生殖和无孢子生殖。

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

类物是最早登陆的维管物，至今仍然是生态系统初级生产力的重要组成部分。

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、苔藓物和裸子物配子体中存在的由单个细胞形成的类似根的结构。

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的优势、海金沙科的显赫和原始被子物的出现为特征。

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，覆盖在类物孢子囊群中正在发育的孢子囊上。

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

就在这片雨林中，高大的ohia lehua树和那叫hapuu的类物给丰富得令人惊奇的动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.

摘要同型孢子类的孢子体可经由同配子体自交、异配子体交配两类配育系统或以无配生殖的方式产生，异配子体交配又可分为异配子体自交和异配子体异交两种方式。

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；较年轻的叶子一回羽状复叶，较老的叶子二回或三回羽状复叶。