The fruits are cordate
silicles flattened at a right angle to septum (angustiseptate); valves prominently reticulately veined, and keeled or winged (Appel and Al-Shehbaz, 2003).
The two genera share ovate leaves with acute apices, cordate
With very few exceptions, these hairy gametophytes were those with cordate
Among the majority of leptosporangiate families, morphological development of the gametophyte proceeds from spore germination through filamentous and spathulate forms culminating in a cordate
form that exhibits taxonspecific propensities for subsequent elongation and branching (Nayar and Kaur, 1971).
meadia and has thinner leaves (Olah & DeFilipps, 1968) that are cordate
or abruptly narrowed to the petiole, rather than tapering as they do in D.
Pellaea ovata belongs to the Section Pellaea and it can be easily recognized by the scandent habit, creeping and dichotomously branched rhizomes, flexuous and pubescent rachises, stalked and ovate to cordate
segments, and lamina glabrous on both surfaces (Fig.
Young sporophyte leaves have various shapes: round, cordate
Mature prothalli have the typical cordate
shape, a few longer than broad in first stages, and gametangia of both sexes occur mixed in the central stripe (Fig.
The prothalli of 40238 were irregular or cordate
in shape, and there were several archegonia (which soon withered) in the cushion zone, but no antheridia or young sporophytes were observed before the prothalli died.
Fresh root tips or immature prothalli (nearly cordate
in shape, before sex organs formed) raised from spores were pretreated for 3-6 hours with 0.
1999, 2001), who found that gametophytes of the genus Dryopteris are spatulate, cordiform-spatulate, reniform, or cordate
To analyze the percentage of sporophyte originated from mature gametophytes and to obtain plants that were used later in growth analysis, 200 mature cordate
gametophytes were transferred to four trays (50 gametophytes in each tray) containing the same substrate.