From an adaptation perspective, unoccupied patches of morphological space are inferred to
be empty because they are of low fitness and selected against. These inferences hinge on …

This paper presents the first broad overview of three main features of microsporogenesis
(male meiosis) in angiosperms: cytokinesis (cell division), intersporal wall formation, and …

Despite the recent surge of interest in studying the evolution of development, surprisingly
little work has been done to investigate the phylogenetic signal in developmental characters …

Micro-and megasporogenesis as well as male and female gametogenesis in genus
Agapanthus are reported for the first time. The results are as follows: The anther wall, whose …

Sporogenesis, gametogenesis, fertilization and embryogenesis of Iris mandshurica Maxim.
were observed using the normal paraffin method. The results are as follows: the …

The embryology of the genus Hemerocallis L. was studied to re-evaluate its current
systematic position proposed by recent phylogenies based on molecular data. Using the …

采用常规石蜡切片法对中国水仙胚胎学特征进行观察和组织化学分析. 其主要结果如下:
花药壁由外至内分别由表皮, 药室内壁, 2~ 3 层的中层和绒毡层组成, 其发育类型属于双子叶型 …

Chez les organismes pluricellulaires, la diversité morphologique observée à tous les
niveaux est frappante, que ce soit au niveau de la taille, des couleurs, ou de la forme des …

Simultaneous microsporogenesis is described for the first time in a grass, Streptochaeta
spicata Schrad., a tropical Brazilian species that belongs in the early‐divergent subfamily …

Pollen grains are generally surrounded by an extremely resistant wall interrupted in places
by apertures that play a key role in reproduction; pollen tube growth is initiated at these sites …