fern GRE专八

Ferns grow in shady and moist places.

类植物生长在阴暗潮湿地方。

Apospory is found in some mosses and ferns.

无孢子生殖存在于一些苔藓和类植物中。

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，柄丛生，基部黑色；较年轻子一回羽状复，较老子二回或三回羽状复。

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。

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ohia lehua树和那hapuu类植物给丰富得令人惊奇动植物撑起了一把保护伞。

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（应为表皮译者注）瓣片状组织，覆盖在类植物孢子囊群中正在发育孢子囊上。

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配子体中存在由单个细胞形成类似根结构。

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

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

精子发育过程中生毛体和多层结构超微结构进行了研究。

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

在许多类植物中常见无融合生殖包括无配子生殖和无孢子生殖。