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Chapter: 11th 12th standard bio zoology Human Body higher secondary school

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Morphology of sporophyte

Morphology of sporophyte
Nephrolepsis Division : Tracheophyta, Sub division : Pteropsida, Class : Leptosporangiatae, Order : Filicales, Family : Dennstaedtiaceae, Genus : Nephrolepsis. The sporophyte consists of rhizome, roots and leaves.

Nephrolepsis

Division      :         Tracheophyta

Sub division         :         Pteropsida

Class :         Leptosporangiatae

Order :         Filicales

Family        :         Dennstaedtiaceae

Genus         :         Nephrolepsis

 

The genus Nephrolepsis is a tropical fern with about 30 species. Most of the species are found in terrestrial habitats. Some species are epiphytes e.g., N. volubilis and N. ramosa. Several species are grown as ornamental plants. In India, there are 5 species. Of these,N. acuta and N. tuberosa are common species.

 

Morphology of sporophyte

 

The sporophyte consists of rhizome, roots and leaves.

 

Rhizome : The rhizome is short and erect or sub-erect, producing elongated slender stolons. Some species have creeping rhizome with adpressed scales. The rhizome of N. tuberosa bears tubers which act as reservoirs for carbohydrates and water. The rhizome is covered with scales.

 

Root : The roots arise from the thizome and stolon. The roots are adventitious and branched.

 

Leaves : The leaves are long, narrow and herbaceous. They are pinnately compound and their length varies from 40 cm to 70 cm or more. The pinnae are sessile, subsessile or shortly petioled. They have usually rounded or cordate base. The veins are prominent and the veinlets are branched with open ends. The tips of veinlets are gland dotted and they extend upto the margins.

The petiloe, rachis and pinnae are covered with multicellular brown haris or scales called ramenta.


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