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Frond dimorphism refers to a difference in ferns between the fertile and sterile fronds. Since ferns, unlike flowering plants, bear spores on the leaf blade itself, this may affect the form of the frond itself. In some species of ferns, there is virtually no difference between the fertile and sterile fronds, such as in the genus Dryopteris, other than the mere presence of the sori, or fruit-dots, on the back of the fronds. Some other species, such as Polystichum acrostichoides (Christmas fern), or some ferns of the genus Osmunda, feature dimorphism on a portion of the frond only. Others, such as some species of Blechnum and Woodwardia, have fertile fronds that are markedly taller than the sterile. Still others, such as Osmunda cinnamomea (Cinnamon fern), or plants of the family Onocleaceae, have fertile fronds that are completely different from the sterile.
Only members of the Onocleaceae and Blechnaceae exhibit a propensity towards dimorphy, while no member of the Athyriaceae is strongly dimorphic, and only some representatives of the Thelypteridaceae have evolved the condition, suggesting a possible close relationship between Onocleaceae and Blechnaceae.[1]
Its importance has been disputed - Copeland for example, considered it taxonomically important,[2] whereas Tryon and Tryon[3] and Kramer[4] all stated that the importance can only be judged in relation to other characteristics.[1]
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Fronddimorphism refers to a difference in ferns between the fertile and sterile fronds. Since ferns, unlike flowering plants, bear spores on the leaf...
Some fern species feature fronddimorphism, in which fertile and sterile fronds differ in appearance and structure. Fern fronds, as with all leaves, arise...
differentiated types of nuclei Fronddimorphism, differing forms of fern fronds between the sterile and fertile fronds Phenotypic dimorphism, switching between two...
creeping rhizomes. The fronds are simply pinnate to pinnate-pinnatifid. There is either no fronddimorphism or only mild dimorphism, either open venation...
the basis of its anastamosing veins and lobed frond form, as well as its more marked fronddimorphism.[citation needed] However, the genus name Lorinseria...
and they possess dichotomously branched pinnae, and high levels of fronddimorphism. Interestingly, even within the limited present range of the species...
rounded than that of A. platyneuron, which also displays fronddimorphism with prostrate sterile fronds. The pinnae of A. resiliens are more widely spaced than...
they sometimes exhibit fronddimorphism, with sterile fronds shorter and with broader and flatter leaflets than the fertile fronds, which rise above on...
rock-inhabiting fern that grows in individual clumps. It displays a slight fronddimorphism, with the larger, fertile leaf blades more or less upright, while the...
reflexed flaps of leaf tissue which resemble indusia. Dimorphism between sterile and fertile fronds is generally subtle. They generally prefer humus-rich...
onion and contains luminous bacteria. The barbels, which look like seaweed fronds, do not contain bacteria but complex paracrystalline photogenic granules...
are typically found in middle and lower fronds, while caterpillars go higher in search fresh ones. Dimorphism has been reported in the pupal and imago...
Wikisource has the text of the 1879 American Cyclopædia article Coal Plants. The fronds of some Carboniferous ferns are almost identical with those of living species...
such as rolled dead leaves; hollow plant stems; flax bushes; dead rolled fronds of tree-ferns; the abandoned cocoons of the bag-moth Liothula omnivora;...
Stephenson, N. P.; Mitchell, E. G. (2024). "'Conga lines' of Ediacaran fronds: insights into the reproductive biology of early metazoans". Royal Society...
ferns have an unpleasant taste due to the high content of tannins in their fronds. Likewise, mangroves appear to be rarely exploited by lemurs due to their...
in small caves or hollow tree trunks in a nest of twigs, bark, or fern fronds. It tended to retreat to the hills and forest for shelter during the day...
; Currie, P. J.; Norell, M. A. (2015). "A possible instance of sexual dimorphism in the tails of two oviraptorosaur dinosaurs". Scientific Reports. 5:...
there are both pleated fan-shaped "nest" fronds that collect and hold water, and gutter-shaped "strap" fronds that channel water: no solitary Platycerium...
as members of the same species may still exhibit some degree of sexual dimorphism, i.e. the phenotypic difference between males and females of the same...
929 lb), respectively. It therefore appears to show less pronounced sexual dimorphism than the northern barred owl race. S. v. helveola (Bangs, 1899): The Texas...
hidden parts of trees above the ground, often on branches, twigs, palm fronds, or lianas. The species is polyoestrous, usually giving birth to a single...
with many other species of Galliformes, turkeys exhibit strong sexual dimorphism. The male is substantially larger than the female, and his feathers have...
Its tail length is 17–27 cm (6.5–10.5 in). The species exhibits sexual dimorphism with females being somewhat larger than males. It has a wide head and...
a near-absent claw. Amongst the northern ghost bat population, sexual dimorphism is present. Specifically, males tend to be slightly larger in size when...
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