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Pollinium structure in periplocoideae (apocynaceae)

 

作者: RudolfL. Verhoeven,   HendrikJ. T. Venter,  

 

期刊: Grana  (Taylor Available online 1998)
卷期: Volume 37, issue 1  

页码: 1-14

 

ISSN:0017-3134

 

年代: 1998

 

DOI:10.1080/00173139809362633

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

The pollinium morphology of ten genera (AtherolepisHook, f.,DecalepisWight & Arn.[=BaeolepisDecne.,JanakiaJ. Joseph & V. Chandras.],FinlaysoniaWall.,GongylospermaKing & Gamble,GymnantheraR. Br.,HemidesmusR. Br.,MeladermaKerr,StelmacryptonBaill.,StreptocaulonWight & Arn.,UtleriaBedd. ex Benth. & Hook, f.) andRaphionacme abyssinicaChiov. of the Periplocoideae have been examined and compared withCynanchum ellipticum(Asclepiadoideae) using light‐, scanning‐and transmission electron microscopy. In the Periplocoideae four free pollinia are produced in each anther. The pollinia are not attached to a translator while in the anther. However, by anthesis the pollinia are deposited on the spoon of the translator. The pollinium is not covered by a pollinium wall (ectexine). The pollinium consists of loosely agglutinated, but not fused, tetrads. The only physical connection between the tetrads was observed when two pores, of adjacent tetrads, are opposite one other. In such cases the tectum and granular stratum of the adjoining tetrads may be fused. The wall structure of the tetrads forming the pollinium consists of a tectum and a granular stratum subtended by an intine.

 

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