Dictyophyton (diktiofiton)

[NL., nus exhibits itself in the form of circular or flabellate fronds, made up of ligulate, radiating, and concentric bands or str iæ, which have the appearance of being inter woven like basketwork. With these flabellate forms are a ociated others which are conical or cylindrical, marked externally by cro str iæ which divide the surface into rectangular spaces, and sometimes covered with long tubercles arranged in vertical and transverse rows. These latter fornis are those which Hall included under the ge neric name of Dictyophyton. They are found in the Chemung group (Devonian) in New York, and in the Waverly group (Lower Carboniferous) of Ohio.