Polypodiophyta
Otherwise know as FERNS !
ferns on a forest floor
One of the first plants that grew on the planet ! Ferns have neither flowers nor produce seeds and have a complex method of reproduction. They also mainly reproduce using spores, not seeds.They first appear in the fossil record about 360 million years ago in the late Devonian period. The groups of ferns we see today, did not truly diversify until much later in the Cretaceous. About the same time the rise of flowering plants.
typical green moss
This group evolved differently from mosses (Bryophyta) in as much as they are vascular plants - plants with both xylem and phloem. These are specialized tubes that carry water upwards to a leaf (xylem) and back down to the roots (phloem). They also form large complex leaves while mosses make little microphylls.
LIFE CYCLE
Fern Life Cycle
The odd life cycle they use involves the production of spores from the adult fern (Sporophyte). You can see these spores on the undersides of leaves or in special spikes. They are usually encased in a membrane like blister called an indusium.
spores erupted from an indusium
Spores fly way in the wind and land on a warm moist spot and germinate. These new, special, and very strange looking plants are called a protonema. It is haploid (only one set of chromosomes from the parent) and technically called a gametophyte (because it produces gametes).
life cycle with gametophyte
The flat small new plant will in turn produce both male and female sex organs. Each of these produce a corresponding egg or sperm. The union of these will become a new diploid plant – having a full 2 sets of chromosomes – it is the sporophyte (the adult fern we know). This is the dominant phase.
USE TODAY
Ferns are not of major economic importance, but some are used for food, medicine, as bio fertilizer, as ornamental plants, and for remediating contaminated soil. They have been the subject of research for their ability to remove some chemical pollutants from the atmosphere. They also play certain roles in folklore !
Fern as food - fiddlehead fern
There are 11 groups of ferns most of which are rare or found only in specific habitats. As follows are samples of some of the major groups we do use in gardens today. Equisetopsida (horsetails)
bundled together they were used by the Pilgrims to scrub cooking pots!
Osmundales
this fern produces its spores in clusters on specialized spikes
Cyatheales
Tree Ferns are very common in tropical Rain Forests
Polypodiales This order encompasses the major lineages of polypod (multi footed) ferns, which comprise more than 80% of today's fern species. They are found in many parts of the world including tropical, semitropical and temperate areas.There are so many genus - I cant show them all here !Here are a few: Asplenium
Birds nest fern
Athyrium
Japanese painted fern
Blechnum
spikey Blechnum !
Davallia
rabbits foot fern - LOVE them !
Dryopteris
always so fluffy and lacy
Nephrolepis
the always pretty Boston fern - we use it outdoors in summer !
Polypodium
Bear's paw - we use it outdoors in summer but also great as an Indoor plant !
Our Garden Care Team can get you the right fern for your garden !
Call us - we LOVE ferns !
PLANT SPECIALISTSGREENING NEW YORK FOR OVER 53 YEARS !
Article written by our Staff Horticulturist, Peter B Morris, BSc, MSc, MBAAll photographs used with permission @SHUTTERSTOCK