Maple Review
Wiki
Wiki
Dictionary
Idiom
Character search
Word Link Tree
Chinese Expert
Knowledge Tree
Chinese English
English Chinese
Language Converter
Time Channel
Dynasty
Country
Today in History
Read
Poems
Novel
History
Wiki
Prose
Tourism
Drama
Search
User
Password
Sign in
Register
English
简体
繁體
pīnyīn
My
Picture
My Map
Collections
I remember
Poems
Novel
History
Wiki
Prose
Tourism
Drama
Maple Review
Feedback
About us
Contextual Help
Help
vegetation
>
megasporangium
Contents
·
No. 1
·
English Expression
·
Containing Phrases
·
More results...
No. 1
大孢子囊
macrosporangium,megasporangum
(1)是产生大孢子的囊状生殖器官。卷柏属的
大孢子囊
是由大孢子叶基部内侧包有双层的壁细胞的表皮细胞产生的,其中有4个大孢子。在水生蕨类,是由
大孢子囊
果中的包有一层壁细胞形成的孢子囊,其中生有32个大孢子,除其中一个以外,其他已全部退化。退化的孢子与沿着壁细胞形成一层毡绒层的细胞质,液泡化后成为大孢子的周壁;
(2)种子植物,特别是裸子植物的胚珠,由于保留有与蕨类大孢子相同的胚囊细胞,所以亦称为
大孢子囊
。
English Expression
: macrosporangium
n.: megasporangium
Containing Phrases
Megasporangium tine