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In botany, a sporophyll is a leaf that bears sporangia. Both microphylls and megaphylls can be sporophylls. In heterosporous plants, sporophylls (whether they are microphylls or megaphylls) bear either megasporangia and thus are called megasporophylls , or microsporangia and are called microsporophylls .
Right: the dry brown stalk, yellow: two seeds, left: the strongly hairy, flat part of the sporophyll. The method of pollination for Dioon plants, whether by wind or animals, has not yet been conclusively determined. The characteristics of the pollen, such as being light, dry, and present in large quantities, suggest wind pollination, which ...
Matteuccia species are used as food plants by the larvae of some Lepidoptera species including Sthenopis pretiosus. Fiddlehands can be eaten raw or cooked. Collect them when 5 to 6 inches high and fronds curled. Fuzz can be removed by rubbing of the hands and wash with water. Cooking takes less than 10 minutes. [18]
Early land plants had sporophytes that produced identical spores (isosporous or homosporous) but the ancestors of the gymnosperms evolved complex heterosporous life cycles in which the spores producing male and female gametophytes were of different sizes, the female megaspores tending to be larger, and fewer in number, than the male microspores.
This plant also has large bulbous underground trunk, medium-sized and strongly keeled leaves. Macrozamia glaucophylla has red-coloured ovoid seed cones , fusiform pollen cones(25 cm (9.8 in) in length and 5 to 6 cm (2.0 to 2.4 in) in diameter), and megasporophyll with an expanded peltate apex.
The male cones are solitary, ovoid, 30 cm long and 7.5 cm broad, with an apical spine and rhomboid sporophyll face. The species is unusual in that it contains a layer of fleshy material between the sarcotesta and the sclerotesta that is thought to aid the seed by providing it with a source of water. As cycad seeds have no dormancy, this would ...
In lichens and other fungi, the sorus is surrounded by an external layer. In some red algae, it may take the form of depression into the thallus. In ferns, the sori form a yellowish or brownish mass on the edge or underside of a fertile frond.
Dioon spinulosum, giant dioon, or gum palm, is a cycad endemic to limestone cliffs and rocky hillsides in the tropical rainforests of Veracruz and Oaxaca, Mexico. [1] [2] It is one of the tallest cycads in the world, growing to 12m in height.
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