eusporangiate


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eusporangiate

(of sporangia) arising from a group of parent cells and having a wall consisting of at least two layers of cells.
References in periodicals archive ?
Furthermore, Equisetum cell walls have recently been shown to contain a hemicellulose, (1 [right arrow] 3,1 [right arrow] 4)-[beta]-D-glucan, thought to be unique to the Poales that is not shared by eusporangiate ferns (Equisetum's closest relatives according to molecular data), Psilotum, or Lycophytes (Fry et al., 2008b; Sorensen et al., 2008; Knox, 2008).
This group has strong leaf dimorphism with large sporangia producing great quantities of spores (eusporangiate) in "fertile spikes" or "segments." The sporangia lack a dehiscence mechanism (annulus) and the spores develop into underground gametophytes.
Post-meiotic determination of division planes is more typical of sporogenesis in tracheophytes, except for some lycophytes and eusporangiate ferns that undergo monoplastidic meiosis (Brown & Lemmon, 1997).