Isoetales, sometimes also written Isoëtales, is an order of plants in the class Lycopodiopsida.
There are about 140-150 living species, all of which are classified in the genus Isoetes (quillworts), with a cosmopolitan distribution, but often scarce to rare. Living species are mostly aquatic or semi-aquatic, and are found in clear ponds and slowly moving streams. Each leaf is slender and broadens downward to a swollen base up to 5 mm wide where the leaves attach in clusters to a bulb-like, underground corm characteristic of most quillworts. This swollen base also contains male and female sporangia, protected by a thin, transparent covering (velum), which is used diagnostically to help identify quillwort species. Quillwort species are very difficult to distinguish by general appearance. The best way to identify them is by examining the megaspores under a microscope.
Isoetes are the only living pteridophytes capable of secondary growth.[1]
^Karrfalt, Eric E. (1982-12-01). "Secondary Development in the Cortex of Isoetes". Botanical Gazette. 143 (4): 439–445. doi:10.1086/337319. ISSN 0006-8071. S2CID 84969975.
Isoetales, sometimes also written Isoëtales, is an order of plants in the class Lycopodiopsida. There are about 140-150 living species, all of which are...
the PPG I system, the class is divided into three orders, Lycopodiales, Isoetales and Selaginellales. Club-mosses (Lycopodiales) are homosporous, but the...
Lycopodiales Isoetes melanospora, a modern member of the Isoetales Restoration of Pleuromeia, an extinct Isoetales genus from the Early Triassic Kenrick, Paul; Crane...
lycopod. It is the only living genus in the family Isoetaceae and order Isoetales. There are currently 192 recognized species, with a cosmopolitan distribution...
During the Early Triassic, lycophytes, particularly those of the order Isoetales (which contains living quillworts), rose to promience due to the environmental...
Lycopodiales DC. ex Bercht. & J.Presl – clubmosses; 1 extant family Order Isoetales Prantl – quillworts; 1 extant family Order Selaginellales Prantl – spikemosses;...
This page's list covers the ferns and allies (Lycopodiopsida, Equisetopsida and Pteridopsida) found in Great Britain and Ireland. For the background to...
Chaloneriaceae is an extinct family of heterosporous lycophyte in the order Isoetales. They are significant in that they feature lobed rooting bases despite...
group Order Family Plant Type Clade involved Lycopodiophyta Isoetopsida Isoetales Isoetaceae hydrophyte Isoetes (the sole genus of class Isoetopsida) -...
Lycopodiopsida, Lepidodendrales are considered to be more closely related to Isoetales (which includes modern quillworts) than to club mosses or spikemosses...
Order Lycopodiales, clubmosses Order Selaginellales, spikemosses Order Isoetales, quillworts and scale trees Class Polypodiopsida, true ferns Subclass...
Order Selaginellales Order †Lepidodendrales Order †Pleuromeiales Order Isoetales (Quillworts) Order †Eophyllophytales Order †Trimerophytales Order †Ibykales...
and Japan. Pleuromeia is placed in the family Pleuromeiaceae within the Isoetales, closely related to Isoetaceae, the family which contains modern Isoetes...
Sri Lanka is a tropical island situated close to the southern tip of India. The invertebrate fauna is as large as it is common to other regions of the...
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