A theca (plural thecae) refers to any case, covering, or sheath.
The outer cells of the theca form the epidermis. Below the epidermis, the somatic cells form the tapetum. These support the development of microspores into mature pollen grains. However, little is known about the underlying genetic mechanisms, which play a role in male sporo- and gametogenesis.
The thecal arrangement of a typical stamen can be as follows :
A Note on Gigantometopus Schwartz and Schuh (Heteroptera: Miridae: Isometopinae) with the Description of a New Species from Borneo
Jan 01, 2012; Abstract--Gigantometopus schuhi n.sp. is described as a new species from Borneo. The limits of the genus Gigantometopus are...
New early Devonian gastropods from the families Crassimarginatidae (new family) and scoliostomatidae (new family), Royal Creek area, Yukon Territory, Canada
Mar 01, 2002; ABSTRACT-Two new distinctive families, Crassimarginatidae and Scoliostomatidae, each characterized by unusual gerontic apertural...