heterospory

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Related to heterosporous: homosporous

heterospory

[‚hed·ə′räs·pə·rē]
(botany)
Development of more than one type of spores, especially relating to the microspores and megaspores in ferns and seed plants.
References in periodicals archive ?
Stems creeping close to the ground to erect, sometimes forming large dense mats, often occurring as individual stems on clay banks; leaves in 4 row, margins finely toothed; heterosporous with terminal strobili 1-2 cm long, 4-angled.
These include 13 extant homosporous filicaleans, 17 extinct homosporous and heterosporous ferns from Paleozoic strata, five extant and one extinct heterosporous leptosporangiate ferns, two extant marattiaceous ferns, two extant ophioglossaceous ferns, one extant and two extinct equisetophytes, both extant homosporous psilotophytes (i.
In Fern Clade #1 the homosporous species Stauropteris oldhamia is sister to the heterosporous species Gillesplea randolphensis + Stauropteris burntislandica.
Perhaps the ultimate tool for addressing this question will be whole-genome sequences of homosporous and heterosporous ferns.
Based on previous observations by Chenery (1949), Al accumulation is mainly characteristic of some groups belonging to the basal leptosporangiate ferns, including some tree ferns, but largely absent in the more derived ferns (the polypodiaceous ferns) and the heterosporous ferns.