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The significance of a new umbellate ornamentation in Isoetes (Isoetaceae: Lycopodiopsida) megaspores
Grana ( IF 0.9 ) Pub Date : 2020-11-18 , DOI: 10.1080/00173134.2020.1825794
Sarvesh Kumar Singh 1 , Pradeep Kumar Shukla 2 , Nawal Kishore Dubey 1 , Santosh Kumar Shukla 3
Affiliation  

Abstract

A new umbellate ornamentation pattern is described in Isoetes megaspores based on scanning electron microscopy and thorough comparisons with sculptural patterns documented in lycophytes and ferns. The umbellate ornamentation is quite distinct from other vertically projected megaspore sculptural patterns (baculate, clavate, gemmulate, pustulate, tuberculate, saccate and verrucate). In addition, megaspore ornamentations described previously for I. dixitei as tuberculate or pustulate have now been corrected as umbellate. This species also possesses a rudimentary velum and internal pigmentation in sporangial wall which has not been reported in other Indian species of the genus. Further, this taxa has a range restricted to the Western Ghats and is confined to a higher elevational range than Indian species characterised by vertically projected megaspore surface ornamentation patterns.



中文翻译:

Isoetes(Isoetaceae:Lycopodiopsida)大孢子中新伞形装饰的意义

摘要

基于扫描电子显微镜和与石松和蕨类植物中记录的雕塑图案的彻底比较,在Isoetes大孢子中描述了一种新的伞形装饰图案。伞形纹饰与其他垂直投影的大孢子雕刻图案(杆状、棒状、宝石状、脓疱状、结核状、囊状和疣状)截然不同。此外,先前描述的I. dixitei 的大孢子纹饰结核或脓疱现在已更正为伞形。该物种在孢子囊壁中还具有基本的帆布和内部色素沉着,这在该属的其他印度物种中未见报道。此外,该分类群的范围仅限于西高止山脉,并且仅限于比以垂直投影的大孢子表面装饰图案为特征的印度物种更高的海拔范围。

更新日期:2020-11-18
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