The things I learn from this blog.
It’s time again for many ferns to start their reproductive cycles and in this photo the tiny spore cases (sorus) of polypody fern (Polypodium virginianum) shine like beacons. Henry David Thoreau liked polypody ferns and said that “Fresh and cheerful communities of the polypody form a lustrous mantle over rocky surfaces in the early spring.” Of course they do exactly that and that’s how they come by the name rock cap fern. They’re an evergreen fern that loves to grow on boulders.
The tiny sori are made up of clusters of sporangia and are naked, meaning they lack the protective cap (indusium) that is found on many ferns. Each will turn a reddish brown color when ripe and ready to release its spores. The spores are as fine as dust and are borne on the wind. Sorus (plural of sori) is from the Greek word sōrós, and…
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