cryptospore

biology

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July 16, 2026

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The term "cryptospore" refers to spore-like structures found in early land plants, particularly liverworts. These structures are considered among the first evidence of terrestrial plants, appearing in the Ordovician Period, approximately 473 to 471 million years ago. Scientists believe cryptospores may have evolved from green algae and are thought to be the precursors of nonvascular plants like liverworts or bryophytes.12

It is important to distinguish "cryptospore" from "cryptosporidium," which is a genus of protozoa that can cause diarrhea in vertebrates, including humans. Another related term, "phaeospore," refers to a spore containing phaeoplasts.345

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bryophyte
Evolution and paleontology
…occurs as fossils of liverwort cryptospores (sporelike structures) that span several genera, was found in rocks laid down between 473 million and 471 million years ago. The cryptospores are considered to be the first known terrestrial plants, and some scientists contend that the diversity of fossil cryptospores found in the…
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…occurs as fossils of liverwort cryptospores (sporelike structures) that span several genera, was found in rocks laid down between 473 million and 471 million years ago. The cryptospores are considered to be the first known terrestrial plants, and some scientists contend that the diversity of fossil cryptospores found in the…
Read More

Ordovician Period
Earliest land plants
Cryptospores (sporelike structures predating land plants) first appeared in the Early Ordovician Epoch and rapidly spread to all continents. Through this time their morphology changed little and shows minute evolution.
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Cryptospores (sporelike structures predating land plants) first appeared in the Early Ordovician Epoch and rapidly spread to all continents. Through this time their morphology changed little and shows minute evolution.
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