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Pteridospermatophyta, also called "pteridosperms" or "seed ferns" are a polyphyletic [1] grouping of extinct seed-producing plants. The earliest fossil evidence for plants of this type are the lyginopterids of late Devonian age. [ 2 ]
Glossopteris (etymology: from Ancient Greek γλῶσσα (glôssa, " tongue ") + πτερίς (pterís, " fern ")) is the largest and best-known genus of the extinct Permian order of seed plants known as Glossopteridales (also known as Arberiales, Ottokariales, or Dictyopteridiales).
Because they are made of the inorganic substances silica or calcium oxalate, phytoliths don't decay with the rest of the plant and can survive in conditions that would destroy organic residues. Phytoliths can provide evidence of both economically important plants and those that are indicative of the environment at a particular time period. [9]
A pteridophyte is a vascular plant (with xylem and phloem) that reproduces by means of spores.Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden.
Seed dormancy is an evolutionary adaptation that prevents seeds from germinating during unsuitable ecological conditions that would typically lead to a low probability of seedling survival. [1] Dormant seeds do not germinate in a specified period of time under a combination of environmental factors that are normally conducive to the germination ...
Dr. Andrea Papa, a psychiatrist and chief medical officer at Advantage Behavioral Health, tells Yahoo Life that there are several reasons why gardening can support your mental health. When you ...
In these species, the seeds do not fall to the ground until the first rains after the bushfire. Seed is typically released over a period of about 90 days. Immediately after bushfire, granivorous birds move in to extract seed from newly open follicles, and to eat seeds that have fallen to the ground. Those seeds that escape the granivores are ...
Crews recently planted 30,000 giant sequoia seedlings in the western Sierra, as part of an ongoing effort to restore groves devastated by wildfire.