fern GRE专八

Ferns grow in shady and moist places.

羊齿类植物生长潮湿的地方。

Apospory is found in some mosses and ferns.

无孢生殖存于一些苔藓和蕨类植物中。

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；较年轻的一回羽状复，较老的二回或三回羽状复。

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.

摘要同型孢蕨类的孢可经由同自交、异交两类育系统或以无生殖的方式产生，异交又可分为异自交和异异交两种方式。

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

就这片雨林中，高大的ohia lehua树和那叫hapuu的蕨类植物给丰富得令人惊奇的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）的瓣片状组织，覆盖蕨类植物孢囊群中正发育的孢囊上。

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

一些藻类、苔藓植物和裸植物中存的由单个细胞形成的类似根的结构。

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的维管植物，至今仍然是生态系统初级生产力的重要组成部分。

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

精发育过程中的生毛和多层结构的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.

许多蕨类植物中常见的无融合生殖包括无生殖和无孢生殖。