What are the characteristics of Cycas?
The cycads typically have an unbranched central stem, which is thick and scaly. Most species grow relatively slowly and have a large, terminal rosette of leaves. The leaves of most species are compound, in that they are composed of numerous small leaflets.
What are three characteristics of cycads?
Cycads are gymnosperms distinguished by crowns of large pinnately compound leaves and by cones typically borne at the ends of the branches. Some cycads have tall unbranched trunks with an armourlike appearance; others have partially buried stems with swollen (tuberous) trunks.
How are microsporangia formed?
The microsporangia are the part of the anther in which the pollen or microspores are developed. As the anther develops, the sporogenous cells present in the tissue form microspore tetrads through meiotic division.
What is the function of the Microsporophyll?
What is a Microsporophyll. Microsporophyll is the other type of leaf-like structure produced by the heterosporous plants. In contrast, it produces microsporangia, the sacs which produce microspores or the male spores.
Which is the new species of Cycas circinalis?
The specimens described as ” C. circinallis ” in Indonesia and New Guinea is now recognized as Cycas rumphii; while the taxon formerly described as the subspecies C. circinallis ssp. riuminiana from the Philippines is now regarded as a separate species, Cycas riuminiana.
How are the microsporophylls arranged on a Cycas?
Cycas is strictly dioecious and heterosporous, the micro-and megasporophylls being borne on different plants. In this case, the microsporophylls only are in compact strobili, while the megasporophylls are arranged spirally like the ordinary crown of foliage leaves around the terminal vegetative bud of the shoot-axis.
What kind of disease does Cycas micronesica have?
The plant was thought to be linked with the degenerative disease lytico-bodig on the island of Guam; however, the cycad native to Guam has since been recognised as a separate species, Cycas micronesica, by K.D. Hill in 1994.
Where does Cycas circinalis Linn grow in India?
Cycas circinalis Linn: Commonly called ‘Jangli-madan-mast-ka-Phul’ (Hindi) or ‘Kamakshi’ (Telugu), C. circinalis is commonly distributed in western part of Peninsular India, Western Ghat and Orissa Hills in India. It is often cultivated in Indian gardens.
