Get Angiosperm Origins: Morphological and Ecological Aspects PDF

By V. A. Krassilov

ISBN-10: 9546420166

ISBN-13: 9789546420169

This article includes a description of the morphological grades and their linking kinds; a dialogue of seed plant evolution; an outline of early angiosperms and their environments; and a n research of morphological developments in separate organs and their implications for angiosperm phylogeny.

Show description

Read Online or Download Angiosperm Origins: Morphological and Ecological Aspects PDF

Similar botany books

Read e-book online Plant Microtechniques and Protocols PDF

A formal realizing of the structural association of the plant physique is vital to any research in plant biology. Experimental experiences in vivo and in situ will result in structural, physiological, and mobile adjustments of the experimental fabric. to check macroscopic and microscopic adjustments, varied histological tools and microtechniques can be utilized as they supply helpful info of the experimental process.

Genetics and Conservation of Rare Plants by Donald A. Falk, Kent E. Holsinger PDF

Approximately seven hundred species of vegetation might develop into extinct via the yr 2000. confronted with this overwhelming prospect, plant conservationists needs to make the most of each method to be had. This special paintings summarizes our present wisdom of the genetics and inhabitants biology of infrequent vegetation, and integrates it with useful conservation ideas.

Get Biotechnology Annual Review, Volume 2, Volume 2 PDF

The Biotechnology Annual overview sequence goals at protecting advancements within the box of biotechnology within the kind of accomplished, illustrated and well-referenced studies. fresh growth during this box, either commercial and academic, in addition to the rise within the variety of new journals reporting new effects, has significantly elevated the necessity for precisely this kind of sequence, consistently offering studies.

Extra info for Angiosperm Origins: Morphological and Ecological Aspects

Sample text

T h e beak is ribbed, abaxially pitted, with the suture m a r k e d by a m e ­ dian g r o o v e , gaping in the ripe cupules (Fig. 6). T h e ovules are solitary, filling the Fig. 6. , a proangiosperm from the Late Jurassic of Burya Basin, Far East, Russia: gynoclade bearing paired cupules (right) and split cupules showing a soliltary anatropous ovule and a rugulate beak (after Krassilov, 1975) compared with a supposedly progenitorial Beania gynoclade (left, after Harris, 1964). locule except in the basal portion, inverted, platyspermic.

T h e scope of the g r o u p is not yet finally determined. T h e bennettites and gnetaleans are included on account of their derived forms, such as Baisia that is distinctly cupulate (Krassilov & B u g d a e v a , 1982), or Eoantha having flower-like gynoecial structures (Krassilov, 1986). W h e t h e r the w h o l e orders or the derived forms alone are proangios p e r m o u s , is left an open question at the m o m e n t . T h e Bennettitales were d o m i n a n t in the M e s o z o i c , declining through the Late Cre­ taceous u p to the eventual extinction at about the Cretaceous/Tertiary boundary.

T h e pollen c o n e s were cycad-like, with scaly s p o r a n g i o p h o r e s . T h e pollen grains w e r e sulcate asaccate, with an alveolar infrastructure. T h e ovulate cones were loose, pendent, with peltate ovuliphores bearing two ovules. In distinction from cycads, even the i m m a t u r e c o n e s were open and the ovules occurred abaxially between the involute margins of a distal pelta (Harris, 1964). T h e ovules w e r e p l a t y s p e r m i c , with resin bodies in the sarcotesta.

Download PDF sample

Angiosperm Origins: Morphological and Ecological Aspects by V. A. Krassilov


by Jason
4.2

Rated 4.72 of 5 – based on 4 votes