A new insight on the genus Pteridium (Dennstaedtiaceae) in Europe based on a revision in the flora of Slovakia

  • 0Ecology and Genetics Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland. mykyta.peregrym@oulu.fi.

|

Summary

This summary is machine-generated.

Related Concept Videos

Non-vascular Seedless Plants 02:26

64.2K

The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.

Nonvascular Plants Were the First Plants on Earth

Nonvascular plants that live today include liverworts, mosses, and hornworts—collectively and informally known as bryophytes.

Nonvascular plants are characterized by a lack of extensive vascular tissue, and have no true roots,...

Seedless Vascular Plants 03:24

60.0K

Seedless Vascular Plants Were the First Tall Plants on Earth

Today, seedless vascular plants are represented by monilophytes and lycophytes. Ferns—the most common seedless vascular plants—are monilophytes. Whisk ferns (and their relatives) and horsetails are also monilophytes. Lycophytes include club mosses, spikemosses, and quillworts—none of which are true mosses.

Unlike nonvascular plants, vascular plants—including seedless vascular plants—have an extensive...

Pollination and Flower Structure 02:40

63.7K

Flowers are the reproductive, seed-producing structures of angiosperms. Typically, flowers consist of sepals, petals, stamens, and carpels. Sepals and petals are the vegetative flower organs. Stamens and carpels are the reproductive organs.  

Flowers must be pollinated to produce seeds. In angiosperms, pollination is the transfer of pollen from the anther of the stamen (the male structure) to the stigma of the carpel (the female structure). Flowers may be self-pollinated or...

Genetics of Speciation 02:16

19.2K

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic...