Two permineralized woods are described in this paper, one from the Late Devonian Cleveland Shale of Ohio, USA and the other from the Late Devonian Huron Shale of Kettle Point, Ontario, Canada. Both samples of wood are satisfactorily preserved with primary and secondary xylem but without cortex and bark. Both are identified as Callixylon. They differ in specific characters from each other and from other described species. Hence two new species are designated, Callixylon beckii and Callixylon huronensis, respectively, to accommodate them in the class Progymnospermopsida (Progymnospermophyta) under the group Archaeopteridales.

中文翻译：

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来自美国俄亥俄州晚泥盆世克利夫兰页岩和加拿大安大略省 Kettle Point 的 Permineralized Callixylon 木材

本文描述了两种透矿化木材，一种来自美国俄亥俄州晚泥盆世克利夫兰页岩，另一种来自加拿大安大略省 Kettle Point 的晚泥盆世休伦页岩。两种木材样品均具有初级和次级木质部，但没有皮层和树皮，保存完好。两者都被确定为Callixylon。它们在特定特征上彼此不同，也与其他描述的物种不同。因此，分别指定了两个新物种 Callixylon beckii 和 Callixylon huronensis，以将它们归入 Archaeopteridales 下的 Progymnospermopsida (Progymnospermophyta) 纲。